Merge pull request #4078 from cryptomator/feature/files-in-use

Feature: Files in use
2026-05-14 00:31:27 +00:00 · 2025-12-29 16:00:36 +01:00
parent bb0c1b54c1 0d7ddd3189
commit eddf586b81
41 changed files with 995 additions and 249 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,9 +10,11 @@ Changes to prior versions can be found on the [Github release page](https://gith
 ## [Unreleased](https://github.com/cryptomator/cryptomator/compare/1.18.0...HEAD)

 ### Added
-* New Self-Update Mechanism (#3948)
+* Self-Update Mechanism (#3948)
  * Implemented `.dmg` update mechanism
  * Implemented Flatpak update mechanism
+* App notifications (#4069)
+* Mark files in-use for Hub vaults (#4078)

 ### Changed
 * Built using JDK 25 (#4031)
--- a/dist/linux/appimage/build.sh
+++ b/dist/linux/appimage/build.sh
@@ -115,6 +115,7 @@ cp ../common/org.cryptomator.Cryptomator.tray-unlocked.svg Cryptomator.AppDir/us
 cp ../common/org.cryptomator.Cryptomator.desktop Cryptomator.AppDir/usr/share/applications/org.cryptomator.Cryptomator.desktop
 cp ../common/org.cryptomator.Cryptomator.metainfo.xml Cryptomator.AppDir/usr/share/metainfo/org.cryptomator.Cryptomator.metainfo.xml
 cp ../common/application-vnd.cryptomator.vault.xml Cryptomator.AppDir/usr/share/mime/packages/application-vnd.cryptomator.vault.xml
+cp ../common/application-vnd.cryptomator.encrypted.xml Cryptomator.AppDir/usr/share/mime/packages/application-vnd.cryptomator.encrypted.xml
 ln -s usr/share/icons/hicolor/scalable/apps/org.cryptomator.Cryptomator.svg Cryptomator.AppDir/org.cryptomator.Cryptomator.svg
 ln -s usr/share/icons/hicolor/scalable/apps/org.cryptomator.Cryptomator.svg Cryptomator.AppDir/.DirIcon
 ln -s usr/share/applications/org.cryptomator.Cryptomator.desktop Cryptomator.AppDir/org.cryptomator.Cryptomator.desktop
--- a/dist/linux/common/application-vnd.cryptomator.encrypted.xml
+++ b/dist/linux/common/application-vnd.cryptomator.encrypted.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
+  <mime-type type="application/vnd.cryptomator.encrypted">
+    <comment>Cryptomator Encrypted Data</comment>
+    <glob pattern="*.c9r"/>
+    <glob pattern="*.c9s"/>
+    <glob pattern="*.c9u"/>
+  </mime-type>
+</mime-info>
--- a/dist/linux/debian/cryptomator.install
+++ b/dist/linux/debian/cryptomator.install
@@ -6,4 +6,5 @@ common/org.cryptomator.Cryptomator.tray-unlocked.svg usr/share/icons/hicolor/sca
 common/org.cryptomator.Cryptomator256.png usr/share/icons/hicolor/256x256/apps
 common/org.cryptomator.Cryptomator512.png usr/share/icons/hicolor/512x512/apps
 common/org.cryptomator.Cryptomator.metainfo.xml usr/share/metainfo
-common/application-vnd.cryptomator.vault.xml usr/share/mime/packages
+common/application-vnd.cryptomator.vault.xml usr/share/mime/packages
+common/application-vnd.cryptomator.encrypted.xml usr/share/mime/packages
--- a/dist/linux/debian/postinst
+++ b/dist/linux/debian/postinst
@@ -25,6 +25,7 @@ case "$1" in
        fi
        xdg-desktop-menu install --novendor /usr/share/applications/org.cryptomator.Cryptomator.desktop
        xdg-mime install /usr/share/mime/packages/application-vnd.cryptomator.vault.xml
+        xdg-mime install /usr/share/mime/packages/application-vnd.cryptomator.encrypted.xml
    ;;

    abort-upgrade|abort-remove|abort-deconfigure)
--- a/dist/linux/debian/prerm
+++ b/dist/linux/debian/prerm
@@ -23,6 +23,7 @@ case "$1" in

        xdg-desktop-menu uninstall --novendor /usr/share/applications/org.cryptomator.Cryptomator.desktop
        xdg-mime uninstall /usr/share/mime/packages/application-vnd.cryptomator.vault.xml
+        xdg-mime uninstall /usr/share/mime/packages/application-vnd.cryptomator.encrypted.xml
    ;;

    failed-upgrade)
--- a/dist/mac/resources/Info.plist
+++ b/dist/mac/resources/Info.plist
@@ -105,6 +105,7 @@
        <array>
          <string>c9r</string>
          <string>c9s</string>
+          <string>c9u</string>
        </array>
        <key>public.mime-type</key>
        <array>
--- a/dist/win/resources/main.wxs
+++ b/dist/win/resources/main.wxs
@@ -94,6 +94,7 @@
              <ns0:MIME ContentType="$(var.ProgIdContentType)" Default="yes"/>
            </ns0:Extension>
            <ns0:Extension Id="c9s" Advertise="no" ContentType="$(var.ProgIdContentType)"/>
+            <ns0:Extension Id="c9u" Advertise="no" ContentType="$(var.ProgIdContentType)"/>
          </ns0:ProgId>
        </ns0:Component>
    </ns0:DirectoryRef>
--- a/pom.xml
+++ b/pom.xml
@@ -33,7 +33,7 @@
 		<nonModularGroupIds>org.ow2.asm,org.apache.jackrabbit,org.apache.httpcomponents</nonModularGroupIds>

 		<!-- cryptomator dependencies -->
-		<cryptomator.cryptofs.version>2.9.0</cryptomator.cryptofs.version>
+		<cryptomator.cryptofs.version>2.10.0-beta2</cryptomator.cryptofs.version>
 		<cryptomator.integrations.version>1.8.0-beta1</cryptomator.integrations.version>
 		<cryptomator.integrations.win.version>1.5.1</cryptomator.integrations.win.version>
 		<cryptomator.integrations.mac.version>1.5.0-beta1</cryptomator.integrations.mac.version>
--- a/src/main/java/module-info.java
+++ b/src/main/java/module-info.java
@@ -1,5 +1,4 @@
 import ch.qos.logback.classic.spi.Configurator;
-import org.cryptomator.networking.SSLContextWithPKCS12TrustStore;
 import org.cryptomator.common.locationpresets.DropboxLinuxLocationPresetsProvider;
 import org.cryptomator.common.locationpresets.DropboxMacLocationPresetsProvider;
 import org.cryptomator.common.locationpresets.DropboxWindowsLocationPresetsProvider;
@@ -14,11 +13,12 @@ import org.cryptomator.common.locationpresets.OneDriveLinuxLocationPresetsProvid
 import org.cryptomator.common.locationpresets.OneDriveMacLocationPresetsProvider;
 import org.cryptomator.common.locationpresets.OneDriveWindowsLocationPresetsProvider;
 import org.cryptomator.common.locationpresets.PCloudLocationPresetsProvider;
-import org.cryptomator.networking.SSLContextWithMacKeychain;
-import org.cryptomator.networking.SSLContextProvider;
-import org.cryptomator.networking.SSLContextWithWindowsCertStore;
 import org.cryptomator.integrations.tray.TrayMenuController;
 import org.cryptomator.logging.LogbackConfiguratorFactory;
+import org.cryptomator.networking.SSLContextProvider;
+import org.cryptomator.networking.SSLContextWithMacKeychain;
+import org.cryptomator.networking.SSLContextWithPKCS12TrustStore;
+import org.cryptomator.networking.SSLContextWithWindowsCertStore;
 import org.cryptomator.ui.traymenu.AwtTrayMenuController;

 open module org.cryptomator.desktop {
--- a/src/main/java/org/cryptomator/common/Constants.java
+++ b/src/main/java/org/cryptomator/common/Constants.java
@@ -13,5 +13,7 @@ public interface Constants {
 	String CRYPTOMATOR_FILENAME_GLOB = "*.cryptomator";
 	URI DEFAULT_KEY_ID = URI.create(MasterkeyFileLoadingStrategy.SCHEME + ":" + MASTERKEY_FILENAME);
 	byte[] PEPPER = new byte[0];
+	// Separator used to concatenate Hub username and device name in the filesystem owner identifier.
+	String HUB_USER_DEVICE_SEPARATOR = "&";

 }
--- a/src/main/java/org/cryptomator/common/EventMap.java
+++ b/src/main/java/org/cryptomator/common/EventMap.java
@@ -1,160 +0,0 @@
-package org.cryptomator.common;
-
-import org.cryptomator.cryptofs.event.BrokenDirFileEvent;
-import org.cryptomator.cryptofs.event.BrokenFileNodeEvent;
-import org.cryptomator.cryptofs.event.ConflictResolutionFailedEvent;
-import org.cryptomator.cryptofs.event.ConflictResolvedEvent;
-import org.cryptomator.cryptofs.event.DecryptionFailedEvent;
-import org.cryptomator.cryptofs.event.FilesystemEvent;
-import org.cryptomator.event.VaultEvent;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import javax.inject.Inject;
-import javax.inject.Singleton;
-import javafx.beans.InvalidationListener;
-import javafx.collections.FXCollections;
-import javafx.collections.MapChangeListener;
-import javafx.collections.ObservableMap;
-import java.nio.file.Path;
-import java.util.Collection;
-import java.util.Comparator;
-import java.util.Map;
-import java.util.Set;
-
-/**
- * Map containing {@link VaultEvent}s.
- * The map is keyed by the ciphertext path of the affected resource _and_ the {@link FilesystemEvent}s class in order to group same events
- * <p>
- * Use {@link EventMap#put(VaultEvent)} to add an element and {@link EventMap#remove(VaultEvent)} to remove it.
- * <p>
- * The map is size restricted to {@value MAX_SIZE} elements. If a _new_ element (i.e. not already present) is added, the least recently added is removed.
- */
-@Singleton
-public class EventMap implements ObservableMap<EventMap.EventKey, VaultEvent> {
-
-	private static final int MAX_SIZE = 300;
-
-	public record EventKey(Path ciphertextPath, Class<? extends FilesystemEvent> c) {}
-
-	private final ObservableMap<EventMap.EventKey, VaultEvent> delegate;
-
-	@Inject
-	public EventMap() {
-		delegate = FXCollections.observableHashMap();
-	}
-
-	@Override
-	public void addListener(MapChangeListener<? super EventKey, ? super VaultEvent> mapChangeListener) {
-		delegate.addListener(mapChangeListener);
-	}
-
-	@Override
-	public void removeListener(MapChangeListener<? super EventKey, ? super VaultEvent> mapChangeListener) {
-		delegate.removeListener(mapChangeListener);
-	}
-
-	@Override
-	public int size() {
-		return delegate.size();
-	}
-
-	@Override
-	public boolean isEmpty() {
-		return delegate.isEmpty();
-	}
-
-	@Override
-	public boolean containsKey(Object key) {
-		return delegate.containsKey(key);
-	}
-
-	@Override
-	public boolean containsValue(Object value) {
-		return delegate.containsValue(value);
-	}
-
-	@Override
-	public VaultEvent get(Object key) {
-		return delegate.get(key);
-	}
-
-	@Override
-	public @Nullable VaultEvent put(EventKey key, VaultEvent value) {
-		return delegate.put(key, value);
-	}
-
-	@Override
-	public VaultEvent remove(Object key) {
-		return delegate.remove(key);
-	}
-
-	@Override
-	public void putAll(@NotNull Map<? extends EventKey, ? extends VaultEvent> m) {
-		delegate.putAll(m);
-	}
-
-	@Override
-	public void clear() {
-		delegate.clear();
-	}
-
-	@Override
-	public @NotNull Set<EventKey> keySet() {
-		return delegate.keySet();
-	}
-
-	@Override
-	public @NotNull Collection<VaultEvent> values() {
-		return delegate.values();
-	}
-
-	@Override
-	public @NotNull Set<Entry<EventKey, VaultEvent>> entrySet() {
-		return delegate.entrySet();
-	}
-
-	@Override
-	public void addListener(InvalidationListener invalidationListener) {
-		delegate.addListener(invalidationListener);
-	}
-
-	@Override
-	public void removeListener(InvalidationListener invalidationListener) {
-		delegate.removeListener(invalidationListener);
-	}
-
-	public synchronized void put(VaultEvent e) {
-		//compute key
-		var key = computeKey(e.actualEvent());
-		//if-else
-		var nullOrEntry = delegate.get(key);
-		if (nullOrEntry == null) {
-			if (size() == MAX_SIZE) {
-				delegate.entrySet().stream() //
-						.min(Comparator.comparing(entry -> entry.getValue().actualEvent().getTimestamp())) //
-						.ifPresent(oldestEntry -> delegate.remove(oldestEntry.getKey()));
-			}
-			delegate.put(key, e);
-		} else {
-			delegate.put(key, nullOrEntry.incrementCount(e.actualEvent()));
-		}
-	}
-
-	public synchronized VaultEvent remove(VaultEvent similar) {
-		//compute key
-		var key = computeKey(similar.actualEvent());
-		return this.remove(key);
-	}
-
-	private EventKey computeKey(FilesystemEvent e) {
-		var p = switch (e) {
-			case DecryptionFailedEvent(_, Path ciphertextPath, _) -> ciphertextPath;
-			case ConflictResolvedEvent(_, _, _, _, Path resolvedCiphertext) -> resolvedCiphertext;
-			case ConflictResolutionFailedEvent(_, _, Path conflictingCiphertext, _) -> conflictingCiphertext;
-			case BrokenDirFileEvent(_, Path ciphertext) -> ciphertext;
-			case BrokenFileNodeEvent(_, _, Path ciphertext) -> ciphertext;
-		};
-		return new EventKey(p, e.getClass());
-	}
-}
--- a/src/main/java/org/cryptomator/common/FilesystemOwnerSupplier.java
+++ b/src/main/java/org/cryptomator/common/FilesystemOwnerSupplier.java
@@ -0,0 +1,18 @@
+package org.cryptomator.common;
+
+import java.util.function.Supplier;
+
+/**
+ * Interface marking a class to be used in {@link org.cryptomator.cryptofs.CryptoFileSystemProperties.Builder#withOwnerGetter(Supplier)}.
+ */
+@FunctionalInterface
+public interface FilesystemOwnerSupplier {
+
+	/**
+	 * Get the filesystem owner.
+	 *
+	 * @return the filesystem owner
+	 */
+	String getOwner();
+
+}
--- a/src/main/java/org/cryptomator/common/vaults/Vault.java
+++ b/src/main/java/org/cryptomator/common/vaults/Vault.java
@@ -10,7 +10,7 @@ package org.cryptomator.common.vaults;

 import org.apache.commons.lang3.SystemUtils;
 import org.cryptomator.common.Constants;
-import org.cryptomator.event.FileSystemEventAggregator;
+import org.cryptomator.common.FilesystemOwnerSupplier;
 import org.cryptomator.common.mount.Mounter;
 import org.cryptomator.common.settings.Settings;
 import org.cryptomator.common.settings.VaultSettings;
@@ -23,6 +23,8 @@ import org.cryptomator.cryptofs.event.FilesystemEvent;
 import org.cryptomator.cryptolib.api.CryptoException;
 import org.cryptomator.cryptolib.api.MasterkeyLoader;
 import org.cryptomator.cryptolib.api.MasterkeyLoadingFailedException;
+import org.cryptomator.event.FileSystemEventAggregator;
+import org.cryptomator.event.NotificationManager;
 import org.cryptomator.integrations.mount.MountFailedException;
 import org.cryptomator.integrations.mount.Mountpoint;
 import org.cryptomator.integrations.mount.UnmountFailedException;
@@ -78,6 +80,7 @@ public class Vault {
 	private final Mounter mounter;
 	private final Settings settings;
 	private final FileSystemEventAggregator fileSystemEventAggregator;
+	private final NotificationManager notificationManager;
 	private final BooleanProperty showingStats;

 	private final AtomicReference<Mounter.MountHandle> mountHandle = new AtomicReference<>(null);
@@ -90,7 +93,8 @@ public class Vault {
 		  @Named("lastKnownException") ObjectProperty<Exception> lastKnownException, //
 		  VaultStats stats, //
 		  Mounter mounter, Settings settings, //
-		  FileSystemEventAggregator fileSystemEventAggregator) {
+		  FileSystemEventAggregator fileSystemEventAggregator, //
+		  NotificationManager notificationManager) {
 		this.vaultSettings = vaultSettings;
 		this.configCache = configCache;
 		this.cryptoFileSystem = cryptoFileSystem;
@@ -109,6 +113,7 @@ public class Vault {
 		this.mounter = mounter;
 		this.settings = settings;
 		this.fileSystemEventAggregator = fileSystemEventAggregator;
+		this.notificationManager = notificationManager;
 		this.showingStats = new SimpleBooleanProperty(false);
 		this.quickAccessEntry = new AtomicReference<>(null);
 	}
@@ -145,14 +150,17 @@ public class Vault {
 			LOG.warn("Limiting cleartext filename length on this device to {}.", vaultSettings.maxCleartextFilenameLength.get());
 		}

-		CryptoFileSystemProperties fsProps = CryptoFileSystemProperties.cryptoFileSystemProperties() //
+		var fsPropsBuilder = CryptoFileSystemProperties.cryptoFileSystemProperties() //
 				.withKeyLoader(keyLoader) //
 				.withFlags(flags) //
 				.withMaxCleartextNameLength(vaultSettings.maxCleartextFilenameLength.get()) //
 				.withVaultConfigFilename(Constants.VAULTCONFIG_FILENAME) //
-				.withFilesystemEventConsumer(this::consumeVaultEvent) //
-				.build();
-		return CryptoFileSystemProvider.newFileSystem(getPath(), fsProps);
+				.withFilesystemEventConsumer(this::consumeVaultEvent);
+		if (keyLoader instanceof FilesystemOwnerSupplier oo) {
+			fsPropsBuilder.withOwnerGetter(oo::getOwner);
+		}
+
+		return CryptoFileSystemProvider.newFileSystem(getPath(), fsPropsBuilder.build());
 	}

 	private void destroyCryptoFileSystem() {
@@ -262,6 +270,7 @@ public class Vault {

 	private void consumeVaultEvent(FilesystemEvent e) {
 		fileSystemEventAggregator.put(this, e);
+		notificationManager.offer(this, e);
 	}

 	// ******************************************************************************
--- a/src/main/java/org/cryptomator/event/FileSystemEventAggregator.java
+++ b/src/main/java/org/cryptomator/event/FileSystemEventAggregator.java
@@ -6,6 +6,7 @@ import org.cryptomator.cryptofs.event.BrokenFileNodeEvent;
 import org.cryptomator.cryptofs.event.ConflictResolutionFailedEvent;
 import org.cryptomator.cryptofs.event.ConflictResolvedEvent;
 import org.cryptomator.cryptofs.event.DecryptionFailedEvent;
+import org.cryptomator.cryptofs.event.FileIsInUseEvent;
 import org.cryptomator.cryptofs.event.FilesystemEvent;

 import javax.inject.Inject;
@@ -101,6 +102,7 @@ public class FileSystemEventAggregator {
 			case ConflictResolutionFailedEvent(_, _, Path conflictingCiphertext, _) -> conflictingCiphertext;
 			case BrokenDirFileEvent(_, Path ciphertext) -> ciphertext;
 			case BrokenFileNodeEvent(_, _, Path ciphertext) -> ciphertext;
+			case FileIsInUseEvent(_, _, Path ciphertext, _, _, _) -> ciphertext;
 		};
 		return new FSEventBucket(v, p, event.getClass());
 	}
--- a/src/main/java/org/cryptomator/event/NotificationManager.java
+++ b/src/main/java/org/cryptomator/event/NotificationManager.java
@@ -0,0 +1,85 @@
+package org.cryptomator.event;
+
+import com.github.benmanes.caffeine.cache.Cache;
+import com.github.benmanes.caffeine.cache.Caffeine;
+import org.cryptomator.common.vaults.Vault;
+import org.cryptomator.cryptofs.event.FileIsInUseEvent;
+import org.cryptomator.cryptofs.event.FilesystemEvent;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+import java.nio.file.Path;
+import java.time.Duration;
+import java.util.List;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * Manager for notifications.
+ * <p>
+ * To add (filesystem) events, use method {@link #offer(Vault, FilesystemEvent)}. If the input event is eligible, it is added to an internal queue.
+ * An event is eligible, if
+ * <ul>
+ *     <li>the event should trigger a notification and</li>
+ *     <li>it is not added within the last {@value DEBOUNCE_THRESHOLD_SECONDS} seconds</li>
+ * </ul>
+ *
+ * @see org.cryptomator.ui.fxapp.FxNotificationManager
+ */
+@Singleton
+public class NotificationManager {
+
+	private static final int DEBOUNCE_THRESHOLD_SECONDS = 5;
+
+	private final Cache<FSEventBucket, FilesystemEvent> debounceCache;
+	private final ConcurrentLinkedQueue<VaultEvent> pendingEvents;
+
+	@Inject
+	public NotificationManager() {
+		debounceCache = Caffeine.newBuilder().expireAfterWrite(Duration.ofSeconds(DEBOUNCE_THRESHOLD_SECONDS)).build();
+		pendingEvents = new ConcurrentLinkedQueue<>();
+	}
+
+	/**
+	 * Offers the given filesystem event to the notification manager.
+	 *
+	 * @param v The vault where the filesystem event happened
+	 * @param e the actual filesystem event
+	 * @return {@code true} if the filesystem event is accepted, otherwise {@code false}.
+	 */
+	public boolean offer(Vault v, FilesystemEvent e) {
+		return switch (e) {
+			case FileIsInUseEvent fiiue -> addEvent(v, fiiue.ciphertextPath(), fiiue);
+			default -> false;
+		};
+	}
+
+	boolean addEvent(Vault v, Path keyPath, FilesystemEvent e) {
+		var key = new FSEventBucket(v, keyPath, e.getClass());
+		var isAdded = new AtomicBoolean(false);
+		debounceCache.asMap().computeIfAbsent(key, _ -> {
+			synchronized (this) {
+				pendingEvents.add(new VaultEvent(v, e));
+				isAdded.set(true);
+			}
+			return e;
+		});
+		return isAdded.get();
+	}
+
+	/**
+	 * Adds all events to the target list and clears afterward the pending-event-queue
+	 *
+	 * @param target list where the filesystem events are copied to
+	 * @return {@code true}, if elements were copied
+	 */
+	public boolean appendToAndClear(List<VaultEvent> target) {
+		//it is not clear, if addAll iterates thread-safe over the pendingEvents
+		//hence we synchronize moving (copy then clear) and adding-single-element operations
+		synchronized (this) {
+			var result = target.addAll(pendingEvents);
+			pendingEvents.clear();
+			return result;
+		}
+	}
+}
--- a/src/main/java/org/cryptomator/event/VaultEvent.java
+++ b/src/main/java/org/cryptomator/event/VaultEvent.java
@@ -3,25 +3,6 @@ package org.cryptomator.event;
 import org.cryptomator.common.vaults.Vault;
 import org.cryptomator.cryptofs.event.FilesystemEvent;

-import java.time.Instant;
+public record VaultEvent(Vault v, FilesystemEvent actualEvent) {

-public record VaultEvent(Vault v, FilesystemEvent actualEvent, int count) implements Comparable<VaultEvent> {
-
-	public VaultEvent(Vault v, FilesystemEvent actualEvent) {
-		this(v, actualEvent, 1);
-	}
-
-	@Override
-	public int compareTo(VaultEvent other) {
-		var timeResult = actualEvent.getTimestamp().compareTo(other.actualEvent().getTimestamp());
-		if(timeResult != 0) {
-			return timeResult;
-		} else {
-			return this.equals(other) ? 0 : this.actualEvent.getClass().getName().compareTo(other.actualEvent.getClass().getName());
-		}
-	}
-
-	public VaultEvent incrementCount(FilesystemEvent update) {
-		return new VaultEvent(v, update, count+1);
-	}
 }
--- a/src/main/java/org/cryptomator/ui/common/FxmlFile.java
+++ b/src/main/java/org/cryptomator/ui/common/FxmlFile.java
@@ -38,6 +38,7 @@ public enum FxmlFile {
 	MIGRATION_RUN("/fxml/migration_run.fxml"), //
 	MIGRATION_START("/fxml/migration_start.fxml"), //
 	MIGRATION_SUCCESS("/fxml/migration_success.fxml"), //
+	NOTIFICATION("/fxml/notification.fxml"), //
 	PREFERENCES("/fxml/preferences.fxml"), //
 	QUIT("/fxml/quit.fxml"), //
 	QUIT_FORCED("/fxml/quit_forced.fxml"), //
@@ -59,6 +60,7 @@ public enum FxmlFile {
 	VAULT_STATISTICS("/fxml/stats.fxml"), //
 	WRONGFILEALERT("/fxml/wrongfilealert.fxml");

+
 	private final String ressourcePathString;

 	FxmlFile(String ressourcePathString) {
--- a/src/main/java/org/cryptomator/ui/common/SystemBarUtil.java
+++ b/src/main/java/org/cryptomator/ui/common/SystemBarUtil.java
@@ -0,0 +1,56 @@
+package org.cryptomator.ui.common;
+
+import javafx.stage.Screen;
+
+/**
+ * Utility class providing methods regarding the OS bar.
+ */
+public class SystemBarUtil {
+
+	public enum Placement {
+		/**
+		 * OS Bar placed at the left screen edge
+		 */
+		LEFT,
+		/**
+		 * OS Bar placed at the top screen edge
+		 */
+		TOP,
+		/**
+		 * OS Bar placed at the right screen edge
+		 */
+		RIGHT,
+		/**
+		 * OS Bar placed at the bottom screen edge
+		 */
+		BOTTOM;
+	}
+
+	/**
+	 * Determines the placement of the OS bar on the given screen.
+	 * <p>
+	 * <b>Assuming the OS bar fills one screen edge completely</b>,
+	 * this method determines that screen edge by comparing the actual screen bounds with the visual ones.
+	 * <p>
+	 * If the screen does not have a system bar, the bottom placement is returned.
+	 * If the screen does have multiple system bars, the first in following priority is returned:
+	 * LEFT, TOP, RIGHT, BOTTOM.
+	 *
+	 * @param screen a {@link Screen} where an OS bar exists
+	 * @return {@link Placement} indicating the screen edge.
+	 */
+	public static Placement getPlacementOfSystembar(Screen screen) {
+		var bounds = screen.getBounds();
+		var vBounds = screen.getVisualBounds();
+		//assumption: the system bar fills a whole screen side
+		if (bounds.getMinX() != vBounds.getMinX()) {
+			return Placement.LEFT;
+		} else if (bounds.getMinY() != vBounds.getMinY()) {
+			return Placement.TOP;
+		} else if (bounds.getMaxX() != vBounds.getMaxX()) {
+			return Placement.RIGHT;
+		} else {
+			return Placement.BOTTOM;
+		}
+	}
+}
--- a/src/main/java/org/cryptomator/ui/controls/FontAwesome5Icon.java
+++ b/src/main/java/org/cryptomator/ui/controls/FontAwesome5Icon.java
@@ -12,6 +12,8 @@ public enum FontAwesome5Icon {
 	CARET_DOWN("\uF0D7"), //
 	CARET_RIGHT("\uF0Da"), //
 	CHECK("\uF00C"), //
+	CHEVRON_LEFT("\uF053"), //
+	CHEVRON_RIGHT("\uF054"), //
 	CLOCK("\uF017"), //
 	CLIPBOARD("\uF328"), //
 	COG("\uF013"), //
@@ -60,6 +62,7 @@ public enum FontAwesome5Icon {
 	TRASH("\uF1F8"), //
 	UNLINK("\uf127"), //
 	USER_COG("\uf4fe"), //
+	USER_LOCK("\uf502"), //
 	WRENCH("\uF0AD"), //
 	WINDOW_MINIMIZE("\uF2D1"), //
 	;
--- a/src/main/java/org/cryptomator/ui/eventview/EventListCellController.java
+++ b/src/main/java/org/cryptomator/ui/eventview/EventListCellController.java
@@ -1,5 +1,8 @@
 package org.cryptomator.ui.eventview;

+import org.apache.commons.lang3.SystemUtils;
+import org.cryptomator.common.Constants;
+import org.cryptomator.cryptofs.event.FileIsInUseEvent;
 import org.cryptomator.event.FSEventBucket;
 import org.cryptomator.event.FSEventBucketContent;
 import org.cryptomator.event.FileSystemEventAggregator;
@@ -115,7 +118,7 @@ public class EventListCellController implements FxController {
 		eventActionsMenu.hide();
 		eventActionsMenu.getItems().clear();
 		eventTooltip.setText(item.getKey().vault().getDisplayName());
-		addAction("generic.action.dismiss", () -> {
+		addLocalizedAction("generic.action.dismiss", () -> {
 			fileSystemEventAggregator.remove(item.getKey());
 		});
 		switch (item.getValue().mostRecentEvent()) {
@@ -124,20 +127,41 @@ public class EventListCellController implements FxController {
 			case DecryptionFailedEvent fse -> this.adjustToDecryptionFailedEvent(fse);
 			case BrokenDirFileEvent fse -> this.adjustToBrokenDirFileEvent(fse);
 			case BrokenFileNodeEvent fse -> this.adjustToBrokenFileNodeEvent(fse);
+			case FileIsInUseEvent fse -> this.adjustToFileInUseEvent(fse);
 		}
 	}

+	private void adjustToFileInUseEvent(FileIsInUseEvent fiiue) {
+		eventIcon.setValue(FontAwesome5Icon.USER_LOCK);
+		eventMessage.setValue(resourceBundle.getString("eventView.entry.inUse.message"));
+		var indexFileName = fiiue.cleartextPath().lastIndexOf("/");
+		eventDescription.setValue(fiiue.cleartextPath().substring(indexFileName + 1));
+		if (revealService != null) {
+			addLocalizedAction("eventView.entry.inUse.showDecrypted", () -> reveal(revealService, convertVaultPathToSystemPath(fiiue.cleartextPath())));
+			addLocalizedAction("eventView.entry.inUse.showEncrypted", () -> reveal(revealService, fiiue.ciphertextPath()));
+		} else {
+			addLocalizedAction("eventView.entry.inUse.copyDecrypted", () -> copyToClipboard(convertVaultPathToSystemPath(fiiue.cleartextPath()).toString()));
+			addLocalizedAction("eventView.entry.inUse.copyEncrypted", () -> copyToClipboard(fiiue.ciphertextPath().toString()));
+		}
+
+		var userAndDevice = fiiue.owner().split(Constants.HUB_USER_DEVICE_SEPARATOR);
+		var user = userAndDevice[0];
+		var device = userAndDevice.length == 1 ? userAndDevice[0] : userAndDevice[1];
+		addLocalizedAction("eventView.entry.inUse.copyUserAndDevice", () -> copyToClipboard(user + ", " + device));
+		addLocalizedAction("eventView.entry.inUse.ignoreLock", fiiue.ignoreMethod());
+	}
+

 	private void adjustToBrokenFileNodeEvent(BrokenFileNodeEvent bfe) {
 		eventIcon.setValue(FontAwesome5Icon.TIMES);
 		eventMessage.setValue(resourceBundle.getString("eventView.entry.brokenFileNode.message"));
 		eventDescription.setValue(bfe.ciphertextPath().getFileName().toString());
 		if (revealService != null) {
-			addAction("eventView.entry.brokenFileNode.showEncrypted", () -> reveal(revealService, bfe.ciphertextPath()));
+			addLocalizedAction("eventView.entry.brokenFileNode.showEncrypted", () -> reveal(revealService, bfe.ciphertextPath()));
 		} else {
-			addAction("eventView.entry.brokenFileNode.copyEncrypted", () -> copyToClipboard(bfe.ciphertextPath().toString()));
+			addLocalizedAction("eventView.entry.brokenFileNode.copyEncrypted", () -> copyToClipboard(bfe.ciphertextPath().toString()));
 		}
-		addAction("eventView.entry.brokenFileNode.copyDecrypted", () -> copyToClipboard(convertVaultPathToSystemPath(bfe.cleartextPath()).toString()));
+		addLocalizedAction("eventView.entry.brokenFileNode.copyDecrypted", () -> copyToClipboard(convertVaultPathToSystemPath(bfe.cleartextPath()).toString()));
 	}

 	private void adjustToConflictResolvedEvent(ConflictResolvedEvent cre) {
@@ -145,9 +169,9 @@ public class EventListCellController implements FxController {
 		eventMessage.setValue(resourceBundle.getString("eventView.entry.conflictResolved.message"));
 		eventDescription.setValue(cre.resolvedCiphertextPath().getFileName().toString());
 		if (revealService != null) {
-			addAction("eventView.entry.conflictResolved.showDecrypted", () -> reveal(revealService, convertVaultPathToSystemPath(cre.resolvedCleartextPath())));
+			addLocalizedAction("eventView.entry.conflictResolved.showDecrypted", () -> reveal(revealService, convertVaultPathToSystemPath(cre.resolvedCleartextPath())));
 		} else {
-			addAction("eventView.entry.conflictResolved.copyDecrypted", () -> copyToClipboard(convertVaultPathToSystemPath(cre.resolvedCleartextPath()).toString()));
+			addLocalizedAction("eventView.entry.conflictResolved.copyDecrypted", () -> copyToClipboard(convertVaultPathToSystemPath(cre.resolvedCleartextPath()).toString()));
 		}
 	}

@@ -156,11 +180,11 @@ public class EventListCellController implements FxController {
 		eventMessage.setValue(resourceBundle.getString("eventView.entry.conflict.message"));
 		eventDescription.setValue(cfe.conflictingCiphertextPath().getFileName().toString());
 		if (revealService != null) {
-			addAction("eventView.entry.conflict.showDecrypted", () -> reveal(revealService, convertVaultPathToSystemPath(cfe.canonicalCleartextPath())));
-			addAction("eventView.entry.conflict.showEncrypted", () -> reveal(revealService, cfe.conflictingCiphertextPath()));
+			addLocalizedAction("eventView.entry.conflict.showDecrypted", () -> reveal(revealService, convertVaultPathToSystemPath(cfe.canonicalCleartextPath())));
+			addLocalizedAction("eventView.entry.conflict.showEncrypted", () -> reveal(revealService, cfe.conflictingCiphertextPath()));
 		} else {
-			addAction("eventView.entry.conflict.copyDecrypted", () -> copyToClipboard(convertVaultPathToSystemPath(cfe.canonicalCleartextPath()).toString()));
-			addAction("eventView.entry.conflict.copyEncrypted", () -> copyToClipboard(cfe.conflictingCiphertextPath().toString()));
+			addLocalizedAction("eventView.entry.conflict.copyDecrypted", () -> copyToClipboard(convertVaultPathToSystemPath(cfe.canonicalCleartextPath()).toString()));
+			addLocalizedAction("eventView.entry.conflict.copyEncrypted", () -> copyToClipboard(cfe.conflictingCiphertextPath().toString()));
 		}
 	}

@@ -169,9 +193,9 @@ public class EventListCellController implements FxController {
 		eventMessage.setValue(resourceBundle.getString("eventView.entry.decryptionFailed.message"));
 		eventDescription.setValue(dfe.ciphertextPath().getFileName().toString());
 		if (revealService != null) {
-			addAction("eventView.entry.decryptionFailed.showEncrypted", () -> reveal(revealService, dfe.ciphertextPath()));
+			addLocalizedAction("eventView.entry.decryptionFailed.showEncrypted", () -> reveal(revealService, dfe.ciphertextPath()));
 		} else {
-			addAction("eventView.entry.decryptionFailed.copyEncrypted", () -> copyToClipboard(dfe.ciphertextPath().toString()));
+			addLocalizedAction("eventView.entry.decryptionFailed.copyEncrypted", () -> copyToClipboard(dfe.ciphertextPath().toString()));
 		}
 	}

@@ -180,14 +204,19 @@ public class EventListCellController implements FxController {
 		eventMessage.setValue(resourceBundle.getString("eventView.entry.brokenDirFile.message"));
 		eventDescription.setValue(bde.ciphertextPath().getParent().getFileName().toString());
 		if (revealService != null) {
-			addAction("eventView.entry.brokenDirFile.showEncrypted", () -> reveal(revealService, bde.ciphertextPath()));
+			addLocalizedAction("eventView.entry.brokenDirFile.showEncrypted", () -> reveal(revealService, bde.ciphertextPath()));
 		} else {
-			addAction("eventView.entry.brokenDirFile.copyEncrypted", () -> copyToClipboard(bde.ciphertextPath().toString()));
+			addLocalizedAction("eventView.entry.brokenDirFile.copyEncrypted", () -> copyToClipboard(bde.ciphertextPath().toString()));
 		}
 	}

-	private void addAction(String localizationKey, Runnable action) {
-		var entry = new MenuItem(resourceBundle.getString(localizationKey));
+	private void addLocalizedAction(String localizationKey, Runnable action) {
+		var entryText = resourceBundle.getString(localizationKey);
+		addAction(entryText, action);
+	}
+
+	private void addAction(String entryText, Runnable action) {
+		var entry = new MenuItem(entryText);
 		entry.getStyleClass().addLast("dropdown-button-context-menu-item");
 		entry.setOnAction(_ -> action.run());
 		eventActionsMenu.getItems().addLast(entry);
@@ -234,18 +263,17 @@ public class EventListCellController implements FxController {
 		}
 	}

-	private Path convertVaultPathToSystemPath(Path p) {
-		if (!(p instanceof CryptoPath)) {
-			throw new IllegalArgumentException("Path " + p + " is not a vault path");
-		}
+	private Path convertVaultPathToSystemPath(String vaultInternalPath) {
 		var v = eventEntry.getValue().getKey().vault();
 		if (!v.isUnlocked()) {
 			return Path.of(System.getProperty("user.home"));
 		}

-		var mountUri = v.getMountPoint().uri();
-		var internalPath = p.toString().substring(1);
-		return Path.of(mountUri.getPath().concat(internalPath).substring(1));
+		var mountPoint = v.getMountPoint().uri().getPath();
+		if(SystemUtils.IS_OS_WINDOWS) {
+			mountPoint = mountPoint.substring(1); //strip away any leading "/", otherwise there are errors
+		}
+		return Path.of(mountPoint, vaultInternalPath.substring(1)); //vaultPaths are always absolute
 	}

 	private void reveal(RevealPathService s, Path p) {
--- a/src/main/java/org/cryptomator/ui/fxapp/FxApplication.java
+++ b/src/main/java/org/cryptomator/ui/fxapp/FxApplication.java
@@ -30,9 +30,20 @@ public class FxApplication {
 	private final FxApplicationTerminator applicationTerminator;
 	private final AutoUnlocker autoUnlocker;
 	private final FxFSEventList fxFSEventList;
+	private final FxNotificationManager notificationManager;

 	@Inject
-	FxApplication(@Named("startupTime") long startupTime, Environment environment, Settings settings, AppLaunchEventHandler launchEventHandler, Lazy<TrayMenuComponent> trayMenu, FxApplicationWindows appWindows, FxApplicationStyle applicationStyle, FxApplicationTerminator applicationTerminator, AutoUnlocker autoUnlocker, FxFSEventList fxFSEventList) {
+	FxApplication(@Named("startupTime") long startupTime, //
+				  Environment environment, //
+				  Settings settings, //
+				  AppLaunchEventHandler launchEventHandler, //
+				  Lazy<TrayMenuComponent> trayMenu, //
+				  FxApplicationWindows appWindows, //
+				  FxApplicationStyle applicationStyle, //
+				  FxApplicationTerminator applicationTerminator, //
+				  AutoUnlocker autoUnlocker, //
+				  FxFSEventList fxFSEventList, //
+				  FxNotificationManager notificationManager) {
 		this.startupTime = startupTime;
 		this.environment = environment;
 		this.settings = settings;
@@ -43,6 +54,7 @@ public class FxApplication {
 		this.applicationTerminator = applicationTerminator;
 		this.autoUnlocker = autoUnlocker;
 		this.fxFSEventList = fxFSEventList;
+		this.notificationManager = notificationManager;
 	}

 	public void start() {
@@ -88,6 +100,7 @@ public class FxApplication {

 		launchEventHandler.startHandlingLaunchEvents();
 		fxFSEventList.schedulePollForUpdates();
+		notificationManager.schedulePollForUpdates();
 		autoUnlocker.tryUnlockForTimespan(2, TimeUnit.MINUTES);
 	}

--- a/src/main/java/org/cryptomator/ui/fxapp/FxApplicationModule.java
+++ b/src/main/java/org/cryptomator/ui/fxapp/FxApplicationModule.java
@@ -13,6 +13,7 @@ import org.cryptomator.ui.eventview.EventViewComponent;
 import org.cryptomator.ui.health.HealthCheckComponent;
 import org.cryptomator.ui.lock.LockComponent;
 import org.cryptomator.ui.mainwindow.MainWindowComponent;
+import org.cryptomator.ui.notification.NotificationComponent;
 import org.cryptomator.ui.preferences.PreferencesComponent;
 import org.cryptomator.ui.quit.QuitComponent;
 import org.cryptomator.ui.recoverykey.RecoveryKeyComponent;
@@ -39,7 +40,8 @@ import java.io.InputStream;
 		UpdateReminderComponent.class, //
 		ShareVaultComponent.class, //
 		EventViewComponent.class, //
-		RecoveryKeyComponent.class})
+		RecoveryKeyComponent.class, //
+		NotificationComponent.class })
 abstract class FxApplicationModule {

 	private static Image createImageFromResource(String resourceName) throws IOException {
@@ -78,4 +80,10 @@ abstract class FxApplicationModule {
 		return factory.create();
 	}

+	@Provides
+	@FxApplicationScoped
+	static NotificationComponent provideNotificationComponent(NotificationComponent.Factory factory) {
+		return factory.create();
+	}
+
 }
--- a/src/main/java/org/cryptomator/ui/fxapp/FxApplicationWindows.java
+++ b/src/main/java/org/cryptomator/ui/fxapp/FxApplicationWindows.java
@@ -11,6 +11,7 @@ import org.cryptomator.ui.error.ErrorComponent;
 import org.cryptomator.ui.eventview.EventViewComponent;
 import org.cryptomator.ui.lock.LockComponent;
 import org.cryptomator.ui.mainwindow.MainWindowComponent;
+import org.cryptomator.ui.notification.NotificationComponent;
 import org.cryptomator.ui.preferences.PreferencesComponent;
 import org.cryptomator.ui.preferences.SelectedPreferencesTab;
 import org.cryptomator.ui.quit.QuitComponent;
@@ -54,6 +55,7 @@ public class FxApplicationWindows {
 	private final LockComponent.Factory lockWorkflowFactory;
 	private final ErrorComponent.Factory errorWindowFactory;
 	private final Lazy<EventViewComponent> eventViewWindow;
+	private final Lazy<NotificationComponent> notificationWindow;
 	private final ExecutorService executor;
 	private final VaultOptionsComponent.Factory vaultOptionsWindow;
 	private final ShareVaultComponent.Factory shareVaultWindow;
@@ -73,6 +75,7 @@ public class FxApplicationWindows {
 								VaultOptionsComponent.Factory vaultOptionsWindow, //
 								ShareVaultComponent.Factory shareVaultWindow, //
 								Lazy<EventViewComponent> eventViewWindow, //
+								Lazy<NotificationComponent> notificationWindow,
 								ExecutorService executor, //
 								Dialogs dialogs) {
 		this.primaryStage = primaryStage;
@@ -85,6 +88,7 @@ public class FxApplicationWindows {
 		this.lockWorkflowFactory = lockWorkflowFactory;
 		this.errorWindowFactory = errorWindowFactory;
 		this.eventViewWindow = eventViewWindow;
+		this.notificationWindow = notificationWindow;
 		this.executor = executor;
 		this.vaultOptionsWindow = vaultOptionsWindow;
 		this.shareVaultWindow = shareVaultWindow;
@@ -193,6 +197,10 @@ public class FxApplicationWindows {
 		return CompletableFuture.supplyAsync(() -> eventViewWindow.get().showEventViewerWindow(), Platform::runLater).whenComplete(this::reportErrors);
 	}

+	public CompletionStage<Stage> showNotification() {
+		return CompletableFuture.supplyAsync(() -> notificationWindow.get().showNotification(), Platform::runLater).whenComplete(this::reportErrors);
+	}
+
 	/**
 	 * Displays the generic error scene in the given window.
 	 *
--- a/src/main/java/org/cryptomator/ui/fxapp/FxNotificationManager.java
+++ b/src/main/java/org/cryptomator/ui/fxapp/FxNotificationManager.java
@@ -0,0 +1,57 @@
+package org.cryptomator.ui.fxapp;
+
+import org.cryptomator.event.NotificationManager;
+import org.cryptomator.event.VaultEvent;
+
+import javax.inject.Inject;
+import javafx.application.Platform;
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Notification manager inside the UI domain.
+ * <p>
+ * Polls the {@link NotificationManager} for pending events every {@value POLL_INTERVAL_SECONDS } seconds and
+ * triggers the notification window display when events are available.
+ * Returns an observable list of events requiring a user notification with {@link #getEventsRequiringNotification()}.
+ *
+ * @see NotificationManager
+ */
+@FxApplicationScoped
+public class FxNotificationManager {
+
+	private static final int POLL_INTERVAL_SECONDS = 1;
+
+	private final NotificationManager notificationManager;
+	private final ScheduledExecutorService scheduler;
+	private final FxApplicationWindows applicationWindows;
+	private final ObservableList<VaultEvent> eventsRequiringNotification;
+
+	@Inject
+	public FxNotificationManager(NotificationManager notificationManager, ScheduledExecutorService scheduler, FxApplicationWindows applicationWindows) {
+		this.notificationManager = notificationManager;
+		this.scheduler = scheduler;
+		this.applicationWindows = applicationWindows;
+		this.eventsRequiringNotification = FXCollections.observableArrayList();
+	}
+
+	public void schedulePollForUpdates() {
+		scheduler.scheduleAtFixedRate(this::checkForPendingNotifications, 0, POLL_INTERVAL_SECONDS, TimeUnit.SECONDS);
+	}
+
+	private void checkForPendingNotifications() {
+		Platform.runLater(() -> {
+			if (notificationManager.appendToAndClear(eventsRequiringNotification)) {
+				applicationWindows.showNotification();
+			}
+		});
+
+	}
+
+	public ObservableList<VaultEvent> getEventsRequiringNotification() {
+		return eventsRequiringNotification;
+	}
+
+}
--- a/src/main/java/org/cryptomator/ui/health/HealthCheckModule.java
+++ b/src/main/java/org/cryptomator/ui/health/HealthCheckModule.java
@@ -63,8 +63,8 @@ abstract class HealthCheckModule {
 	@Provides
 	@HealthCheckWindow
 	@HealthCheckScoped
-	static KeyLoadingStrategy provideKeyLoadingStrategy(KeyLoadingComponent.Builder compBuilder, @HealthCheckWindow Vault vault, @Named("unlockWindow") Stage window ) {
-		return compBuilder.vault(vault).window(window).build().keyloadingStrategy();
+	static KeyLoadingStrategy provideKeyLoadingStrategy(KeyLoadingComponent.Factory compFactory, @HealthCheckWindow Vault vault, @Named("unlockWindow") Stage window ) {
+		return compFactory.create(vault, window).keyloadingStrategy();
 	}

 	@Provides
--- a/src/main/java/org/cryptomator/ui/keyloading/KeyLoadingComponent.java
+++ b/src/main/java/org/cryptomator/ui/keyloading/KeyLoadingComponent.java
@@ -3,11 +3,8 @@ package org.cryptomator.ui.keyloading;
 import dagger.BindsInstance;
 import dagger.Subcomponent;
 import org.cryptomator.common.vaults.Vault;
-import org.cryptomator.cryptolib.api.MasterkeyLoader;

 import javafx.stage.Stage;
-import java.util.Map;
-import java.util.function.Supplier;

@KeyLoadingScoped
@Subcomponent(modules = {KeyLoadingModule.class})
@@ -16,16 +13,10 @@ public interface KeyLoadingComponent {
 	@KeyLoading
 	KeyLoadingStrategy keyloadingStrategy();

-	@Subcomponent.Builder
-	interface Builder {
+	@Subcomponent.Factory
+	interface Factory {

-		@BindsInstance
-		Builder vault(@KeyLoading Vault vault);
-
-		@BindsInstance
-		Builder window(@KeyLoading Stage window);
-
-		KeyLoadingComponent build();
+		KeyLoadingComponent create(@BindsInstance @KeyLoading Vault vault, @KeyLoading @BindsInstance Stage window);
 	}

 }
--- a/src/main/java/org/cryptomator/ui/keyloading/hub/HubKeyLoadingModule.java
+++ b/src/main/java/org/cryptomator/ui/keyloading/hub/HubKeyLoadingModule.java
@@ -66,6 +66,13 @@ public abstract class HubKeyLoadingModule {
 		return new AtomicReference<>();
 	}

+	@Provides
+	@Named("filesystemOwnerId")
+	@KeyLoadingScoped
+	static AtomicReference<String> provideFilesystemOwnerIdRef() {
+		return new AtomicReference<>();
+	}
+
 	@Provides
 	@KeyLoadingScoped
 	static CompletableFuture<ReceivedKey> provideResult() {
--- a/src/main/java/org/cryptomator/ui/keyloading/hub/HubKeyLoadingStrategy.java
+++ b/src/main/java/org/cryptomator/ui/keyloading/hub/HubKeyLoadingStrategy.java
@@ -2,6 +2,7 @@ package org.cryptomator.ui.keyloading.hub;

 import com.google.common.base.Preconditions;
 import dagger.Lazy;
+import org.cryptomator.common.FilesystemOwnerSupplier;
 import org.cryptomator.common.keychain.KeychainManager;
 import org.cryptomator.common.keychain.NoKeychainAccessProviderException;
 import org.cryptomator.common.settings.DeviceKey;
@@ -23,25 +24,28 @@ import java.net.URI;
 import java.util.concurrent.CancellationException;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutionException;
+import java.util.concurrent.atomic.AtomicReference;

@KeyLoading
-public class HubKeyLoadingStrategy implements KeyLoadingStrategy {
+public class HubKeyLoadingStrategy implements KeyLoadingStrategy, FilesystemOwnerSupplier {

-	private static final String SCHEME_PREFIX = "hub+";
+	public static final String SCHEME_PREFIX = "hub+";
 	public static final String SCHEME_HUB_HTTP = SCHEME_PREFIX + "http";
 	public static final String SCHEME_HUB_HTTPS = SCHEME_PREFIX + "https";

 	private final Stage window;
 	private final KeychainManager keychainManager;
+	private final AtomicReference<String> fsOwnerId;
 	private final Lazy<Scene> authFlowScene;
 	private final Lazy<Scene> noKeychainScene;
 	private final CompletableFuture<ReceivedKey> result;
 	private final DeviceKey deviceKey;

 	@Inject
-	public HubKeyLoadingStrategy(@KeyLoading Stage window, @FxmlScene(FxmlFile.HUB_AUTH_FLOW) Lazy<Scene> authFlowScene, @FxmlScene(FxmlFile.HUB_NO_KEYCHAIN) Lazy<Scene> noKeychainScene, CompletableFuture<ReceivedKey> result, DeviceKey deviceKey, KeychainManager keychainManager, @Named("windowTitle") String windowTitle) {
+	public HubKeyLoadingStrategy(@KeyLoading Stage window, @FxmlScene(FxmlFile.HUB_AUTH_FLOW) Lazy<Scene> authFlowScene, @FxmlScene(FxmlFile.HUB_NO_KEYCHAIN) Lazy<Scene> noKeychainScene, CompletableFuture<ReceivedKey> result, DeviceKey deviceKey, KeychainManager keychainManager, @Named("windowTitle") String windowTitle, @Named("filesystemOwnerId") AtomicReference<String> fsOwnerId) {
 		this.window = window;
 		this.keychainManager = keychainManager;
+		this.fsOwnerId = fsOwnerId;
 		window.setTitle(windowTitle);
 		window.setOnCloseRequest(_ -> result.cancel(true));
 		this.authFlowScene = authFlowScene;
@@ -90,4 +94,13 @@ public class HubKeyLoadingStrategy implements KeyLoadingStrategy {
 		});
 	}

+	@Override
+	public String getOwner() {
+		var name = fsOwnerId.get();
+		if (name == null) {
+			throw new IllegalStateException("Owner is not yet determined");
+		}
+		return name;
+	}
+
 }
--- a/src/main/java/org/cryptomator/ui/keyloading/hub/ReceiveKeyController.java
+++ b/src/main/java/org/cryptomator/ui/keyloading/hub/ReceiveKeyController.java
@@ -6,6 +6,7 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.base.Preconditions;
 import com.nimbusds.jose.JWEObject;
 import dagger.Lazy;
+import org.cryptomator.common.Constants;
 import org.cryptomator.common.vaults.Vault;
 import org.cryptomator.ui.common.FxController;
 import org.cryptomator.ui.common.FxmlFile;
@@ -41,7 +42,6 @@ import java.util.concurrent.atomic.AtomicReference;
 public class ReceiveKeyController implements FxController {

 	private static final Logger LOG = LoggerFactory.getLogger(ReceiveKeyController.class);
-	private static final String SCHEME_PREFIX = "hub+";
 	private static final ObjectMapper JSON = new ObjectMapper().setDefaultLeniency(true);
 	private static final Duration REQ_TIMEOUT = Duration.ofSeconds(10);

@@ -50,6 +50,7 @@ public class ReceiveKeyController implements FxController {
 	private final String vaultId;
 	private final String deviceId;
 	private final String bearerToken;
+	private final AtomicReference<String> fsOwnerId;
 	private final CompletableFuture<ReceivedKey> result;
 	private final Lazy<Scene> registerDeviceScene;
 	private final Lazy<Scene> legacyRegisterDeviceScene;
@@ -59,12 +60,25 @@ public class ReceiveKeyController implements FxController {
 	private final HttpClient httpClient;

 	@Inject
-	public ReceiveKeyController(@KeyLoading Vault vault, ExecutorService executor, @KeyLoading Stage window, HubConfig hubConfig, @Named("deviceId") String deviceId, @Named("bearerToken") AtomicReference<String> tokenRef, CompletableFuture<ReceivedKey> result, @FxmlScene(FxmlFile.HUB_REGISTER_DEVICE) Lazy<Scene> registerDeviceScene, @FxmlScene(FxmlFile.HUB_LEGACY_REGISTER_DEVICE) Lazy<Scene> legacyRegisterDeviceScene, @FxmlScene(FxmlFile.HUB_UNAUTHORIZED_DEVICE) Lazy<Scene> unauthorizedScene, @FxmlScene(FxmlFile.HUB_REQUIRE_ACCOUNT_INIT) Lazy<Scene> accountInitializationScene, @FxmlScene(FxmlFile.HUB_INVALID_LICENSE) Lazy<Scene> invalidLicenseScene) {
+	public ReceiveKeyController(@KeyLoading Vault vault, //
+								ExecutorService executor, //
+								@KeyLoading Stage window, //
+								HubConfig hubConfig, //
+								@Named("deviceId") String deviceId, //
+								@Named("bearerToken") AtomicReference<String> tokenRef, //
+								@Named("filesystemOwnerId") AtomicReference<String> fsOwnerId, //
+								CompletableFuture<ReceivedKey> result, //
+								@FxmlScene(FxmlFile.HUB_REGISTER_DEVICE) Lazy<Scene> registerDeviceScene, //
+								@FxmlScene(FxmlFile.HUB_LEGACY_REGISTER_DEVICE) Lazy<Scene> legacyRegisterDeviceScene, //
+								@FxmlScene(FxmlFile.HUB_UNAUTHORIZED_DEVICE) Lazy<Scene> unauthorizedScene, //
+								@FxmlScene(FxmlFile.HUB_REQUIRE_ACCOUNT_INIT) Lazy<Scene> accountInitializationScene, //
+								@FxmlScene(FxmlFile.HUB_INVALID_LICENSE) Lazy<Scene> invalidLicenseScene) {
 		this.window = window;
 		this.hubConfig = hubConfig;
 		this.vaultId = extractVaultId(vault.getVaultConfigCache().getUnchecked().getKeyId()); // TODO: access vault config's JTI directly (requires changes in cryptofs)
 		this.deviceId = deviceId;
 		this.bearerToken = Objects.requireNonNull(tokenRef.get());
+		this.fsOwnerId = fsOwnerId;
 		this.result = result;
 		this.registerDeviceScene = registerDeviceScene;
 		this.legacyRegisterDeviceScene = legacyRegisterDeviceScene;
@@ -81,7 +95,34 @@ public class ReceiveKeyController implements FxController {
 	}

 	public void receiveKey() {
-		requestApiConfig();
+		requestUserData();
+	}
+
+	private void requestUserData() {
+		var userUri = hubConfig.URIs.API.resolve("users/me?withDevices=false");
+		var request = HttpRequest.newBuilder(userUri) //
+				.header("Authorization", "Bearer " + bearerToken) //
+				.GET() //
+				.timeout(REQ_TIMEOUT) //
+				.build();
+		httpClient.sendAsync(request, HttpResponse.BodyHandlers.ofString(StandardCharsets.UTF_8)) //
+				.thenAcceptAsync(this::receivedUserData) //
+				.exceptionally(this::retrievalFailed);
+	}
+
+	private void receivedUserData(HttpResponse<String> response) {
+		LOG.debug("GET {} -> Status Code {}", response.request().uri(), response.statusCode());
+		try {
+			if (response.statusCode() == 200) {
+				var user = JSON.reader().readValue(response.body(), UserDto.class);
+				fsOwnerId.set(user.name);
+				requestApiConfig();
+			} else {
+				throw new IllegalStateException("Unexpected response " + response.statusCode());
+			}
+		} catch (IOException e) {
+			throw new UncheckedIOException(e);
+		}
 	}

 	/**
@@ -144,6 +185,7 @@ public class ReceiveKeyController implements FxController {
 			switch (response.statusCode()) {
 				case 200 -> {
 					var device = JSON.reader().readValue(response.body(), DeviceDto.class);
+					fsOwnerId.accumulateAndGet(device.name, (s1, s2) -> s1 + Constants.HUB_USER_DEVICE_SEPARATOR + s2);
 					requestVaultMasterkey(device.userPrivateKey);
 				}
 				case 404 -> Platform.runLater(this::needsDeviceRegistration);
@@ -289,13 +331,16 @@ public class ReceiveKeyController implements FxController {
 	}

 	private static String extractVaultId(URI vaultKeyUri) {
-		assert vaultKeyUri.getScheme().startsWith(SCHEME_PREFIX);
+		assert vaultKeyUri.getScheme().startsWith(HubKeyLoadingStrategy.SCHEME_PREFIX);
 		var path = vaultKeyUri.getPath();
 		return path.substring(path.lastIndexOf('/') + 1);
 	}

 	@JsonIgnoreProperties(ignoreUnknown = true)
-	private record DeviceDto(@JsonProperty(value = "userPrivateKey", required = true) String userPrivateKey) {}
+	private record UserDto(@JsonProperty(value = "name", required = true) String name) {}
+
+	@JsonIgnoreProperties(ignoreUnknown = true)
+	private record DeviceDto(@JsonProperty(value = "name", required = true) String name, @JsonProperty(value = "userPrivateKey", required = true) String userPrivateKey) {}

 	@JsonIgnoreProperties(ignoreUnknown = true)
 	private record ConfigDto(@JsonProperty(value = "apiLevel") int apiLevel) {}
--- a/src/main/java/org/cryptomator/ui/mainwindow/VaultListController.java
+++ b/src/main/java/org/cryptomator/ui/mainwindow/VaultListController.java
@@ -15,8 +15,8 @@ import org.cryptomator.ui.addvaultwizard.AddVaultWizardComponent;
 import org.cryptomator.ui.common.FxController;
 import org.cryptomator.ui.common.VaultService;
 import org.cryptomator.ui.dialogs.Dialogs;
-import org.cryptomator.ui.fxapp.FxFSEventList;
 import org.cryptomator.ui.fxapp.FxApplicationWindows;
+import org.cryptomator.ui.fxapp.FxFSEventList;
 import org.cryptomator.ui.preferences.SelectedPreferencesTab;
 import org.cryptomator.ui.recoverykey.RecoveryKeyComponent;
 import org.slf4j.Logger;
@@ -139,8 +139,8 @@ public class VaultListController implements FxController {
 		vaultList.setItems(vaults);
 		vaultList.setCellFactory(cellFactory);

-		vaultList.prefHeightProperty().bind(
-				vaultList.fixedCellSizeProperty().multiply(Bindings.size(vaultList.getItems()))
+		vaultList.prefHeightProperty().bind( //
+				vaultList.fixedCellSizeProperty().multiply(Bindings.size(vaultList.getItems())) //
 		);

 		selectedVault.bind(vaultList.getSelectionModel().selectedItemProperty());
@@ -157,11 +157,11 @@ public class VaultListController implements FxController {
 		//unlock vault on double click
 		vaultList.addEventFilter(MouseEvent.MOUSE_CLICKED, click -> {
 			if (click.getClickCount() >= 2) {
-				Optional.ofNullable(selectedVault.get())
-						.filter(Vault::isLocked)
+				Optional.ofNullable(selectedVault.get()) //
+						.filter(Vault::isLocked) //
 						.ifPresent(vault -> appWindows.startUnlockWorkflow(vault, mainWindow));
-				Optional.ofNullable(selectedVault.get())
-						.filter(Vault::isUnlocked)
+				Optional.ofNullable(selectedVault.get()) //
+						.filter(Vault::isUnlocked) //
 						.ifPresent(vaultService::reveal);
 			}
 		});
--- a/src/main/java/org/cryptomator/ui/notification/NotificationComponent.java
+++ b/src/main/java/org/cryptomator/ui/notification/NotificationComponent.java
@@ -0,0 +1,35 @@
+package org.cryptomator.ui.notification;
+
+import dagger.Lazy;
+import dagger.Subcomponent;
+import org.cryptomator.ui.common.FxmlFile;
+import org.cryptomator.ui.common.FxmlScene;
+
+import javafx.scene.Scene;
+import javafx.stage.Stage;
+
+@NotificationScoped
+@Subcomponent(modules = {NotificationModule.class})
+public interface NotificationComponent {
+
+	@NotificationWindow
+	Stage window();
+
+	@FxmlScene(FxmlFile.NOTIFICATION)
+	Lazy<Scene> scene();
+
+	default Stage showNotification() {
+		var window = window();
+		window.setScene(scene().get());
+		window.sizeToScene();
+		window.show();
+		window.requestFocus();
+		return window;
+	}
+
+	@Subcomponent.Factory
+	interface Factory {
+		NotificationComponent create();
+	}
+
+}
--- a/src/main/java/org/cryptomator/ui/notification/NotificationController.java
+++ b/src/main/java/org/cryptomator/ui/notification/NotificationController.java
@@ -0,0 +1,245 @@
+package org.cryptomator.ui.notification;
+
+import org.cryptomator.common.Constants;
+import org.cryptomator.common.settings.Settings;
+import org.cryptomator.cryptofs.event.FileIsInUseEvent;
+import org.cryptomator.event.VaultEvent;
+import org.cryptomator.ui.common.FxController;
+import org.cryptomator.ui.fxapp.FxNotificationManager;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.inject.Inject;
+import javafx.beans.binding.Bindings;
+import javafx.beans.property.IntegerProperty;
+import javafx.beans.property.ObjectProperty;
+import javafx.beans.property.SimpleIntegerProperty;
+import javafx.beans.property.SimpleListProperty;
+import javafx.beans.property.SimpleObjectProperty;
+import javafx.beans.property.SimpleStringProperty;
+import javafx.beans.property.StringProperty;
+import javafx.beans.value.ObservableStringValue;
+import javafx.beans.value.ObservableValue;
+import javafx.fxml.FXML;
+import javafx.stage.Stage;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.time.format.FormatStyle;
+import java.util.Locale;
+import java.util.Objects;
+import java.util.ResourceBundle;
+import java.util.concurrent.ExecutorService;
+
+@NotificationScoped
+public class NotificationController implements FxController {
+
+	private static final Logger LOG = LoggerFactory.getLogger(NotificationController.class);
+	private static final DateTimeFormatter LOCAL_TIME_FORMATTER_TEMPLATE = DateTimeFormatter.ofLocalizedTime(FormatStyle.SHORT).withZone(ZoneId.systemDefault());
+	private static final String BUG_MSG = "If you see this message, please report it on the Cryptomator issue tracker.";
+
+	private final Stage window;
+	private final SimpleListProperty<VaultEvent> events;
+	private final ResourceBundle resourceBundle;
+	private final IntegerProperty selectionIndex;
+	private final ObservableStringValue paging;
+	private final ObjectProperty<VaultEvent> selectedEvent;
+	private final ObservableValue<Boolean> singleEvent;
+	private final StringProperty fileName;
+	private final StringProperty vaultName;
+	private final StringProperty eventTimestamp;
+	private final StringProperty message;
+	private final StringProperty description;
+	private final StringProperty actionText;
+	private final ExecutorService executorService;
+	private final DateTimeFormatter localizedTimeFormatter;
+
+	@Inject
+	public NotificationController(@NotificationWindow Stage window, FxNotificationManager notificationManager, ExecutorService executorService, ResourceBundle resourceBundle, Settings settings) {
+		this.window = window;
+		var preferredLanguage = settings.language.get();
+		this.localizedTimeFormatter = LOCAL_TIME_FORMATTER_TEMPLATE.withLocale(preferredLanguage == null ? Locale.getDefault() : Locale.forLanguageTag(preferredLanguage));
+		this.events = new SimpleListProperty<>(notificationManager.getEventsRequiringNotification());
+		this.resourceBundle = resourceBundle;
+		this.selectionIndex = new SimpleIntegerProperty(-1);
+		this.selectedEvent = new SimpleObjectProperty<>();
+		this.singleEvent = events.sizeProperty().map(size -> size.intValue() == 1);
+		this.paging = Bindings.createStringBinding(() -> selectionIndex.get() + 1 + "/" + events.size(), selectionIndex, events);
+		this.vaultName = new SimpleStringProperty();
+		this.eventTimestamp = new SimpleStringProperty();
+		this.message = new SimpleStringProperty();
+		this.fileName = new SimpleStringProperty("");
+		this.description = new SimpleStringProperty();
+		this.actionText = new SimpleStringProperty();
+		this.executorService = executorService;
+	}
+
+	@FXML
+	public void initialize() {
+		window.setOnShowing(_ -> selectionIndex.set(0));
+		selectionIndex.addListener((_, _, n) -> {
+			if (!events.isEmpty()) {
+				selectedEvent.setValue(events.get(n.intValue()));
+			}
+		});
+		selectedEvent.addListener(this::selectTexts);
+	}
+
+	private void selectTexts(ObservableValue<? extends VaultEvent> observable, VaultEvent oldEvent, VaultEvent newEvent) {
+		if (newEvent == null) {
+			vaultName.set("");
+			message.set("NO CONTENT");
+			description.set(BUG_MSG);
+			actionText.set(null);
+			return;
+		}
+
+		vaultName.set(newEvent.v().getDisplayName());
+		switch (newEvent.actualEvent()) {
+			case FileIsInUseEvent fiiue -> {
+				var userAndDevice = fiiue.owner().split(Constants.HUB_USER_DEVICE_SEPARATOR);
+				var user = userAndDevice[0];
+				var device = userAndDevice.length == 1 ? userAndDevice[0] : userAndDevice[1];
+				var cleartextFileName = fiiue.cleartextPath().substring(fiiue.cleartextPath().lastIndexOf('/') + 1);
+				eventTimestamp.set(localizedTimeFormatter.format(fiiue.lastUpdated()));
+				message.set("File is locked by another device");
+				fileName.set(cleartextFileName);
+				description.set("The file is opened by %s on device %s. Ask the user to close the file and sync again. Otherwise, you can ignore the lock and open it anyway.".formatted(user, device));
+				actionText.set("Ignore Lock");
+				/* TODO: Once feature is out of beta, activate translations
+				message.set(resourceBundle.getString("notification.inUse.message"));
+				description.set(resourceBundle.getString("notification.inUse.description").formatted(fiiue.cleartextPath(), user, device));
+				actionText.set(resourceBundle.getString("notification.inUse.action"));
+				 */
+			}
+			default -> {
+				message.set("NO CONTENT");
+				description.set(BUG_MSG);
+				actionText.set(null);
+			}
+		}
+	}
+
+	@FXML
+	public void processSelectedEvent() {
+		try {
+			var ev = selectedEvent.get();
+			switch (ev.actualEvent()) {
+				case FileIsInUseEvent fiiue -> {
+					executorService.submit(fiiue.ignoreMethod());
+				}
+				default -> {
+				} //normally nothing
+			}
+		} finally {
+			removeSelectedEvent();
+		}
+	}
+
+	private void removeSelectedEvent() {
+		int i = selectionIndex.get();
+		var size = events.size();
+		if (i < 0 || i >= size) {
+			LOG.error("Selection index {} is out of bounds of list size {} during event removal. Closing Window.", i, size);
+			window.close();
+			return;
+		}
+
+		events.remove(i);
+		if (events.isEmpty()) {
+			window.close(); //no more events
+		} else if (events.size() == i) {
+			selectionIndex.set(i - 1); //triggers event update
+		} else {
+			selectedEvent.set(events.get(i));
+		}
+	}
+
+	@FXML
+	public void previousNotification() {
+		int i = selectionIndex.get();
+		if (i != 0) {
+			selectionIndex.set(i - 1);
+		}
+	}
+
+	@FXML
+	public void nextNotification() {
+		int i = selectionIndex.get();
+		if (i != events.size() - 1) {
+			selectionIndex.set(i + 1);
+		}
+	}
+
+	@FXML
+	public void close() {
+		events.clear();
+		window.close();
+	}
+
+
+	//FXML bindings
+	public ObservableValue<String> eventTimeProperty() {
+		return eventTimestamp;
+	}
+
+	public String getEventTime() {
+		return eventTimestamp.get();
+	}
+
+	public ObservableValue<String> vaultNameProperty() {
+		return vaultName;
+	}
+
+	public String getVaultName() {
+		return vaultName.get();
+	}
+
+	public ObservableValue<String> fileNameProperty() {
+		return fileName;
+	}
+
+	public String getFileName() {
+		return fileName.get();
+	}
+
+	public ObservableValue<String> messageProperty() {
+		return message;
+	}
+
+	public String getMessage() {
+		return message.get();
+	}
+
+	public ObservableValue<String> descriptionProperty() {
+		return description;
+	}
+
+	public String getDescription() {
+		return description.get();
+	}
+
+	public StringProperty actionTextProperty() {
+		return actionText;
+	}
+
+	public String getActionText() {
+		return Objects.requireNonNullElse(actionText.get(), "");
+	}
+
+	public ObservableStringValue pagingProperty() {
+		return paging;
+	}
+
+	public String getPaging() {
+		return paging.get();
+	}
+
+	public ObservableValue<Boolean> singleEventProperty() {
+		return singleEvent;
+	}
+
+	public boolean isSingleEvent() {
+		return singleEvent.getValue();
+	}
+
+}
--- a/src/main/java/org/cryptomator/ui/notification/NotificationModule.java
+++ b/src/main/java/org/cryptomator/ui/notification/NotificationModule.java
@@ -0,0 +1,99 @@
+package org.cryptomator.ui.notification;
+
+import dagger.Binds;
+import dagger.Module;
+import dagger.Provides;
+import dagger.multibindings.IntoMap;
+import org.apache.commons.lang3.SystemUtils;
+import org.cryptomator.ui.common.DefaultSceneFactory;
+import org.cryptomator.ui.common.FxController;
+import org.cryptomator.ui.common.FxControllerKey;
+import org.cryptomator.ui.common.FxmlFile;
+import org.cryptomator.ui.common.FxmlLoaderFactory;
+import org.cryptomator.ui.common.FxmlScene;
+import org.cryptomator.ui.common.StageInitializer;
+import org.cryptomator.ui.common.SystemBarUtil;
+
+import javax.inject.Provider;
+import javafx.scene.Scene;
+import javafx.stage.Modality;
+import javafx.stage.Screen;
+import javafx.stage.Stage;
+import javafx.stage.StageStyle;
+import java.util.Map;
+import java.util.ResourceBundle;
+
+@Module
+abstract class NotificationModule {
+
+	@Provides
+	@NotificationWindow
+	@NotificationScoped
+	static Stage provideStage(StageInitializer initializer) {
+		Stage stage = new Stage(StageStyle.TRANSPARENT);
+		stage.setTitle("Filesystem notification"); //TODO: translate
+		stage.setResizable(false);
+		stage.initModality(Modality.NONE);
+		stage.setAlwaysOnTop(true);
+		initializer.accept(stage);
+		stage.setOnShown(_ -> placeWindow(stage));
+		return stage;
+	}
+
+	/**
+	 * Places the notification window on the screen according to some heuristic based on operating system and system bar placement.
+	 * <p>
+	 * On macOS, the window is placed in the top-right corner of the primary screen, following platform conventions.
+	 * On other operating systems, the window placement depends on the location of the system bar:
+	 * <ul>
+	 *   <li>If the system bar is at the top, the window is centered horizontally at the top of the screen.</li>
+	 *   <li>Otherwise (e.g., system bar at the bottom or elsewhere), the window is placed in the bottom-right corner.</li>
+	 * </ul>
+	 * <p>
+	 * The method uses the visual bounds of the primary screen to avoid overlapping with system UI elements.
+	 * Assumes the window size has already been set before calling this method.
+	 *
+	 * @param window the Stage representing the notification window to be placed
+	 */
+	static void placeWindow(Stage window) {
+		var screen = Screen.getPrimary();
+		var vBounds = screen.getVisualBounds();
+		if (SystemUtils.IS_OS_MAC) { //place to right top
+			window.setX(vBounds.getMaxX() - window.getWidth());
+			window.setY(vBounds.getMinY());
+		} else {
+			switch (SystemBarUtil.getPlacementOfSystembar(screen)) {
+				case TOP -> { //place to middle top
+					window.setX(vBounds.getMinX() + (vBounds.getWidth() - window.getWidth()) / 2.0);
+					window.setY(vBounds.getMinY());
+				}
+				default -> { //place to right bottom
+					window.setX(vBounds.getMaxX() - window.getWidth());
+					window.setY(vBounds.getMaxY() - window.getHeight());
+				}
+			}
+		}
+	}
+
+	// javafx setup
+
+	@Provides
+	@FxmlScene(FxmlFile.NOTIFICATION)
+	@NotificationScoped
+	static Scene provideNotificationScene(@NotificationWindow FxmlLoaderFactory fxmlLoaders) {
+		return fxmlLoaders.createScene(FxmlFile.NOTIFICATION);
+	}
+
+	@Provides
+	@NotificationScoped
+	@NotificationWindow
+	static FxmlLoaderFactory provideFxmlLoaderFactory(Map<Class<? extends FxController>, Provider<FxController>> factories, DefaultSceneFactory sceneFactory, ResourceBundle resourceBundle) {
+		return new FxmlLoaderFactory(factories, sceneFactory, resourceBundle);
+	}
+
+	@Binds
+	@IntoMap
+	@FxControllerKey(NotificationController.class)
+	abstract FxController bindNotificationController(NotificationController controller);
+
+}
--- a/src/main/java/org/cryptomator/ui/notification/NotificationScoped.java
+++ b/src/main/java/org/cryptomator/ui/notification/NotificationScoped.java
@@ -0,0 +1,11 @@
+package org.cryptomator.ui.notification;
+
+import javax.inject.Scope;
+import java.lang.annotation.Documented;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+@Scope
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+public @interface NotificationScoped {}
--- a/src/main/java/org/cryptomator/ui/notification/NotificationWindow.java
+++ b/src/main/java/org/cryptomator/ui/notification/NotificationWindow.java
@@ -0,0 +1,12 @@
+package org.cryptomator.ui.notification;
+
+import javax.inject.Qualifier;
+import java.lang.annotation.Documented;
+import java.lang.annotation.Retention;
+
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+@Qualifier
+@Documented
+@Retention(RUNTIME)
+public @interface NotificationWindow {}
--- a/src/main/java/org/cryptomator/ui/unlock/UnlockModule.java
+++ b/src/main/java/org/cryptomator/ui/unlock/UnlockModule.java
@@ -57,8 +57,8 @@ abstract class UnlockModule {
 	@Provides
 	@UnlockWindow
 	@UnlockScoped
-	static KeyLoadingStrategy provideKeyLoadingStrategy(KeyLoadingComponent.Builder compBuilder, @UnlockWindow Vault vault, @UnlockWindow Stage window) {
-		return compBuilder.vault(vault).window(window).build().keyloadingStrategy();
+	static KeyLoadingStrategy provideKeyLoadingStrategy(KeyLoadingComponent.Factory compFactory, @UnlockWindow Vault vault, @UnlockWindow Stage window) {
+		return compFactory.create(vault, window).keyloadingStrategy();
 	}

 	@Provides
--- a/src/main/resources/css/dark_theme.css
+++ b/src/main/resources/css/dark_theme.css
@@ -113,6 +113,11 @@
 	-fx-font-size: 1.2em;
 }

+.label-window-title {
+	-fx-font-family: 'Open Sans SemiBold';
+	-fx-font-size: 1.0em;
+}
+
 .label-small {
 	-fx-font-size: 0.8em;
 }
@@ -1186,3 +1191,32 @@
    -fx-background-color: MAIN_BG;
    -fx-font-size: 1.166667em; /* 14pt - 2 more than the default font */
 }
+/*******************************************************************************
+ *                                                                             *
+ * Notification Window
+ *                                                                             *
+ ******************************************************************************/
+.notification-window {
+	-fx-background-color: MAIN_BG;
+	-fx-background-radius: 8px;
+	-fx-border-radius: 8px;
+	-fx-background-insets: 0;
+	-fx-border-color: MUTED_BG;
+	-fx-border-width: 1px;
+	-fx-effect: dropshadow(gaussian, rgba(0, 0, 0, 0.2), 28, 0.35, 0, 6);
+}
+
+.notification-window .dialog-header {
+	-fx-alignment: center-left;
+}
+
+.notification-window .window-bar-button {
+	-fx-background-color: transparent;
+	-fx-border-color: transparent;
+	-fx-padding: 6 8 6 8;
+}
+
+.notification-window .window-bar-button:armed {
+	-fx-background-color: CONTROL_BG_ARMED;
+	-fx-background-radius: 8;
+}
--- a/src/main/resources/css/light_theme.css
+++ b/src/main/resources/css/light_theme.css
@@ -113,6 +113,11 @@
 	-fx-font-size: 1.2em;
 }

+.label-window-title {
+	-fx-font-family: 'Open Sans SemiBold';
+	-fx-font-size: 1.0em;
+}
+
 .label-small {
 	-fx-font-size: 0.8em;
 }
@@ -1186,3 +1191,33 @@
    -fx-background-color: MAIN_BG;
    -fx-font-size: 1.166667em; /* 14pt - 2 more than the default font */
 }
+
+/*******************************************************************************
+ *                                                                             *
+ * Notification Window
+ *                                                                             *
+ ******************************************************************************/
+.notification-window {
+	-fx-background-color: MAIN_BG;
+	-fx-background-radius: 8px;
+	-fx-border-radius: 8px;
+	-fx-background-insets: 0;
+	-fx-border-color: MUTED_BG;
+	-fx-border-width: 1px;
+	-fx-effect: dropshadow(gaussian, rgba(0, 0, 0, 0.2), 28, 0.35, 0, 6);
+}
+
+.notification-window .dialog-header {
+	-fx-alignment: center-left;
+}
+
+.notification-window .window-bar-button {
+	-fx-background-color: transparent;
+	-fx-border-color: transparent;
+	-fx-padding: 6 8 6 8;
+}
+
+.notification-window .window-bar-button:armed {
+	-fx-background-color: CONTROL_BG_ARMED;
+	-fx-background-radius: 8;
+}
--- a/src/main/resources/fxml/notification.fxml
+++ b/src/main/resources/fxml/notification.fxml
@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import org.cryptomator.ui.controls.FontAwesome5IconView?>
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.control.Button?>
+<?import javafx.scene.control.Separator?>
+<?import javafx.scene.control.Label?>
+<?import javafx.scene.image.Image?>
+<?import javafx.scene.image.ImageView?>
+<?import javafx.scene.layout.BorderPane?>
+<?import javafx.scene.layout.HBox?>
+<?import javafx.scene.layout.Region?>
+<?import javafx.scene.layout.VBox?>
+<?import javafx.scene.control.ScrollPane?>
+<BorderPane xmlns="http://javafx.com/javafx"
+			xmlns:fx="http://javafx.com/fxml"
+			fx:controller="org.cryptomator.ui.notification.NotificationController"
+			prefHeight="200.0" prefWidth="400.0" maxHeight="200.0" maxWidth="400.0"
+			styleClass="notification-window">
+	<padding>
+		<Insets top="12" right="12" bottom="12" left="12"/>
+	</padding>
+	<top>
+		<VBox >
+			<HBox spacing="6" styleClass="dialog-header" alignment="CENTER_LEFT">
+				<ImageView fitHeight="12" preserveRatio="true" cache="true">
+					<Image url="@../img/logo64.png"/>
+				</ImageView>
+				<Label text="Cryptomator" styleClass="label-window-title"/>
+				<Region HBox.hgrow="ALWAYS"/>
+				<HBox styleClass="dialog-header" alignment="CENTER_LEFT" visible="${!controller.singleEvent}">
+					<Button contentDisplay="GRAPHIC_ONLY" styleClass="window-bar-button" onAction="#previousNotification" accessibleText="%generic.button.previous">
+						<graphic>
+							<FontAwesome5IconView glyph="CHEVRON_LEFT" glyphSize="12"/>
+						</graphic>
+					</Button>
+					<Label text="${controller.paging}" styleClass="label-window-title"/>
+					<Button contentDisplay="GRAPHIC_ONLY" styleClass="window-bar-button" onAction="#nextNotification" accessibleText="%generic.button.next">
+						<graphic>
+							<FontAwesome5IconView glyph="CHEVRON_RIGHT" glyphSize="12"/>
+						</graphic>
+					</Button>
+				</HBox>
+				<Button contentDisplay="GRAPHIC_ONLY" onAction="#close" styleClass="window-bar-button" accessibleText="%generic.button.close">
+					<graphic>
+						<FontAwesome5IconView glyph="TIMES" glyphSize="12"/>
+					</graphic>
+				</Button>
+			</HBox>
+			<Separator orientation="HORIZONTAL"/>
+		</VBox>
+	</top>
+
+	<center>
+		<VBox>
+			<padding>
+				<Insets top="6"/>
+			</padding>
+			<HBox>
+				<Label text="${controller.vaultName}" styleClass="label-small" wrapText="true"/>
+				<Region minWidth="12" HBox.hgrow="ALWAYS"/>
+				<Label text="${controller.eventTime}" styleClass="label-small" />
+			</HBox>
+			<Label text="${controller.message}" styleClass="label-large" wrapText="true"/>
+			<Label  text="${controller.fileName}" styleClass="label" textOverrun="CENTER_ELLIPSIS" visible="${!controller.fileName.empty}" managed="${!controller.fileName.empty}"/>
+			<Region minHeight="6"/>
+			<ScrollPane minViewportWidth="370" minViewportHeight="50">
+				<Label text="${controller.description}" styleClass="label" wrapText="true" maxWidth="370"/>
+			</ScrollPane>
+			<Region VBox.vgrow="ALWAYS"/>
+			<Button text="${controller.actionText}" onAction="#processSelectedEvent"
+					visible="${!controller.actionText.empty}" managed="${!controller.actionText.empty}"/>
+		</VBox>
+	</center>
+</BorderPane>
--- a/src/main/resources/i18n/strings.properties
+++ b/src/main/resources/i18n/strings.properties
@@ -13,6 +13,7 @@ generic.button.close=Close
 generic.button.copy=Copy
 generic.button.copied=Copied!
 generic.button.done=Done
+generic.button.previous=Previous
 generic.button.next=Next
 generic.button.print=Print
 generic.button.remove=Remove
@@ -695,3 +696,17 @@ eventView.entry.brokenFileNode.message=Broken filesystem node
 eventView.entry.brokenFileNode.showEncrypted=Show broken, encrypted node
 eventView.entry.brokenFileNode.copyEncrypted=Copy path of broken, encrypted node
 eventView.entry.brokenFileNode.copyDecrypted=Copy decrypted path
+eventView.entry.inUse.message=Locked File
+eventView.entry.inUse.showDecrypted=Show decrypted file
+eventView.entry.inUse.copyDecrypted=Copy decrypted path
+eventView.entry.inUse.showEncrypted=Show encrypted file
+eventView.entry.inUse.copyEncrypted=Copy encrypted path
+eventView.entry.inUse.copyUserAndDevice=Copy locking user and device name
+eventView.entry.inUse.ignoreLock=Ignore Lock
+
+
+# Notifications
+## FileIsInUse Notification
+#notification.inUse.message=File is locked
+#notification.inUse.description=File %s is opened by user %s (%s). Ask the user to close the file. Otherwise, you can ignore the lock and open it anyway, but be aware of the data loss risk.
+#notification.inUse.action=Ignore Lock