diff --git a/Wino.Core.Domain/Interfaces/ISynchronizationManager.cs b/Wino.Core.Domain/Interfaces/ISynchronizationManager.cs
index 86ec5cce..bfacad73 100644
--- a/Wino.Core.Domain/Interfaces/ISynchronizationManager.cs
+++ b/Wino.Core.Domain/Interfaces/ISynchronizationManager.cs
@@ -81,6 +81,11 @@ public interface ISynchronizationManager
     /// </summary>
     IWinoSynchronizerBase CreateSynchronizerForAccount(MailAccount account);
 
+    /// <summary>
+    /// Cancels ongoing synchronizations for the given account.
+    /// </summary>
+    Task CancelSynchronizationsAsync(Guid accountId);
+
     /// <summary>
     /// Destroys the synchronizer for the given account.
     /// </summary>
diff --git a/Wino.Core/Services/SynchronizationManager.cs b/Wino.Core/Services/SynchronizationManager.cs
index cadaadda..108a08ea 100644
--- a/Wino.Core/Services/SynchronizationManager.cs
+++ b/Wino.Core/Services/SynchronizationManager.cs
@@ -26,6 +26,7 @@ public class SynchronizationManager : ISynchronizationManager
     public static SynchronizationManager Instance => _instance.Value;
 
     private readonly ConcurrentDictionary<Guid, IWinoSynchronizerBase> _synchronizerCache = new();
+    private readonly ConcurrentDictionary<Guid, CancellationTokenSource> _accountSynchronizationCancellationSources = new();
     private readonly SemaphoreSlim _initializationSemaphore = new(1, 1);
     private readonly ILogger _logger = Log.ForContext<SynchronizationManager>();
 
@@ -141,9 +142,14 @@ public class SynchronizationManager : ISynchronizationManager
         _logger.Information("Starting mail synchronization for account {AccountId} with type {SyncType}",
                           options.AccountId, options.Type);
 
+        var accountCancellationSource = _accountSynchronizationCancellationSources.GetOrAdd(options.AccountId, _ => new CancellationTokenSource());
+        using var linkedCancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(
+            cancellationToken,
+            accountCancellationSource.Token);
+
         try
         {
-            var result = await synchronizer.SynchronizeMailsAsync(options, cancellationToken);
+            var result = await synchronizer.SynchronizeMailsAsync(options, linkedCancellationTokenSource.Token);
 
             _logger.Information("Mail synchronization completed for account {AccountId} with state {State}",
                               options.AccountId, result.CompletedState);
@@ -156,6 +162,11 @@ public class SynchronizationManager : ISynchronizationManager
 
             return result;
         }
+        catch (OperationCanceledException)
+        {
+            _logger.Information("Mail synchronization canceled for account {AccountId}", options.AccountId);
+            return MailSynchronizationResult.Canceled;
+        }
         catch (AuthenticationAttentionException authEx)
         {
             _logger.Warning("Account {AccountId} requires attention due to authentication issues", options.AccountId);
@@ -350,9 +361,14 @@ public class SynchronizationManager : ISynchronizationManager
         _logger.Information("Starting calendar synchronization for account {AccountId} with type {SyncType}",
                           options.AccountId, options.Type);
 
+        var accountCancellationSource = _accountSynchronizationCancellationSources.GetOrAdd(options.AccountId, _ => new CancellationTokenSource());
+        using var linkedCancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(
+            cancellationToken,
+            accountCancellationSource.Token);
+
         try
         {
-            var result = await synchronizer.SynchronizeCalendarEventsAsync(options, cancellationToken);
+            var result = await synchronizer.SynchronizeCalendarEventsAsync(options, linkedCancellationTokenSource.Token);
 
             _logger.Information("Calendar synchronization completed for account {AccountId} with state {State}",
                               options.AccountId, result.CompletedState);
@@ -363,6 +379,11 @@ public class SynchronizationManager : ISynchronizationManager
 
             return result;
         }
+        catch (OperationCanceledException)
+        {
+            _logger.Information("Calendar synchronization canceled for account {AccountId}", options.AccountId);
+            return CalendarSynchronizationResult.Canceled;
+        }
         catch (AuthenticationAttentionException authEx)
         {
             _logger.Warning("Account {AccountId} requires attention due to authentication issues", options.AccountId);
@@ -491,6 +512,38 @@ public class SynchronizationManager : ISynchronizationManager
         }
     }
 
+    /// <summary>
+    /// Cancels all in-flight synchronizations for the given account.
+    /// </summary>
+    /// <param name="accountId">Account ID to cancel synchronizations for</param>
+    public Task CancelSynchronizationsAsync(Guid accountId)
+    {
+        EnsureInitialized();
+
+        if (_accountSynchronizationCancellationSources.TryRemove(accountId, out var cancellationSource))
+        {
+            try
+            {
+                if (!cancellationSource.IsCancellationRequested)
+                {
+                    cancellationSource.Cancel();
+                }
+            }
+            catch (ObjectDisposedException)
+            {
+                // no-op
+            }
+            finally
+            {
+                cancellationSource.Dispose();
+            }
+
+            _logger.Information("Canceled ongoing synchronizations for account {AccountId}", accountId);
+        }
+
+        return Task.CompletedTask;
+    }
+
     /// <summary>
     /// Destroys the synchronizer for the given account.
     /// </summary>
@@ -498,6 +551,7 @@ public class SynchronizationManager : ISynchronizationManager
     public async Task DestroySynchronizerAsync(Guid accountId)
     {
         EnsureInitialized();
+        await CancelSynchronizationsAsync(accountId);
 
         if (_synchronizerCache.TryRemove(accountId, out var synchronizer))
         {
@@ -506,6 +560,10 @@ public class SynchronizationManager : ISynchronizationManager
                 await synchronizer.KillSynchronizerAsync();
                 _logger.Information("Destroyed synchronizer for account {AccountId}", accountId);
             }
+            catch (OperationCanceledException)
+            {
+                _logger.Information("Synchronizer destruction canceled for account {AccountId}", accountId);
+            }
             catch (Exception ex)
             {
                 _logger.Error(ex, "Failed to destroy synchronizer for account {AccountId}", accountId);
diff --git a/Wino.Mail.WinUI/App.xaml.cs b/Wino.Mail.WinUI/App.xaml.cs
index 35965c35..a711a7e4 100644
--- a/Wino.Mail.WinUI/App.xaml.cs
+++ b/Wino.Mail.WinUI/App.xaml.cs
@@ -1,6 +1,8 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.Messaging;
 using Microsoft.Extensions.DependencyInjection;
@@ -32,7 +34,13 @@ public partial class App : WinoApplication,
     IRecipient<NewMailSynchronizationRequested>,
     IRecipient<NewCalendarSynchronizationRequested>
 {
+    private const int InboxSyncsPerFullSync = 20;
     private ISynchronizationManager? _synchronizationManager;
+    private IPreferencesService? _preferencesService;
+    private IAccountService? _accountService;
+    private CancellationTokenSource? _autoSynchronizationLoopCts;
+    private readonly SemaphoreSlim _autoSynchronizationSemaphore = new(1, 1);
+    private readonly Dictionary<Guid, int> _inboxSyncCounters = [];
 
     public App()
     {
@@ -136,6 +144,12 @@ public partial class App : WinoApplication,
         await InitializeServicesAsync();
 
         _synchronizationManager = Services.GetRequiredService<ISynchronizationManager>();
+        _preferencesService = Services.GetRequiredService<IPreferencesService>();
+        _accountService = Services.GetRequiredService<IAccountService>();
+
+        _preferencesService.PreferenceChanged -= PreferencesServiceChanged;
+        _preferencesService.PreferenceChanged += PreferencesServiceChanged;
+        RestartAutoSynchronizationLoop();
 
         // Check if launched from toast notification.
         if (IsNotificationActivation(out AppNotificationActivatedEventArgs toastArgs))
@@ -463,6 +477,132 @@ public partial class App : WinoApplication,
         };
     }
 
+    private void PreferencesServiceChanged(object? sender, string propertyName)
+    {
+        if (propertyName != nameof(IPreferencesService.EmailSyncIntervalMinutes))
+            return;
+
+        RestartAutoSynchronizationLoop();
+    }
+
+    private void RestartAutoSynchronizationLoop()
+    {
+        if (_preferencesService == null)
+            return;
+
+        StopAutoSynchronizationLoop();
+
+        int intervalMinutes = Math.Max(1, _preferencesService.EmailSyncIntervalMinutes);
+        _autoSynchronizationLoopCts = new CancellationTokenSource();
+
+        _ = RunAutoSynchronizationLoopAsync(TimeSpan.FromMinutes(intervalMinutes), _autoSynchronizationLoopCts.Token);
+        LogActivation($"Automatic sync loop started. Interval: {intervalMinutes} minute(s).");
+    }
+
+    private void StopAutoSynchronizationLoop()
+    {
+        if (_autoSynchronizationLoopCts == null)
+            return;
+
+        _autoSynchronizationLoopCts.Cancel();
+        _autoSynchronizationLoopCts.Dispose();
+        _autoSynchronizationLoopCts = null;
+    }
+
+    private async Task RunAutoSynchronizationLoopAsync(TimeSpan interval, CancellationToken cancellationToken)
+    {
+        try
+        {
+            await ExecuteAutoSynchronizationAsync(cancellationToken).ConfigureAwait(false);
+
+            using var timer = new PeriodicTimer(interval);
+
+            while (await timer.WaitForNextTickAsync(cancellationToken).ConfigureAwait(false))
+            {
+                await ExecuteAutoSynchronizationAsync(cancellationToken).ConfigureAwait(false);
+            }
+        }
+        catch (OperationCanceledException)
+        {
+            // no-op
+        }
+        catch (Exception ex)
+        {
+            LogActivation($"Automatic sync loop failed: {ex.Message}");
+        }
+    }
+
+    private async Task ExecuteAutoSynchronizationAsync(CancellationToken cancellationToken)
+    {
+        if (_synchronizationManager == null || _accountService == null)
+            return;
+
+        bool lockTaken = false;
+
+        try
+        {
+            lockTaken = await _autoSynchronizationSemaphore.WaitAsync(0, cancellationToken).ConfigureAwait(false);
+            if (!lockTaken)
+                return;
+
+            var accounts = await _accountService.GetAccountsAsync().ConfigureAwait(false);
+            var currentAccountIds = accounts.Select(a => a.Id).ToHashSet();
+            _inboxSyncCounters.Keys.Where(a => !currentAccountIds.Contains(a)).ToList().ForEach(a => _inboxSyncCounters.Remove(a));
+
+            foreach (var account in accounts)
+            {
+                cancellationToken.ThrowIfCancellationRequested();
+
+                if (_synchronizationManager.IsAccountSynchronizing(account.Id))
+                    continue;
+
+                var inboxSyncOptions = new MailSynchronizationOptions()
+                {
+                    AccountId = account.Id,
+                    Type = MailSynchronizationType.InboxOnly
+                };
+
+                var inboxSyncResult = await _synchronizationManager.SynchronizeMailAsync(inboxSyncOptions, cancellationToken).ConfigureAwait(false);
+
+                if (inboxSyncResult.CompletedState is SynchronizationCompletedState.Success or SynchronizationCompletedState.PartiallyCompleted)
+                {
+                    _inboxSyncCounters.TryAdd(account.Id, 0);
+                    _inboxSyncCounters[account.Id]++;
+
+                    if (_inboxSyncCounters[account.Id] >= InboxSyncsPerFullSync)
+                    {
+                        var fullSyncOptions = new MailSynchronizationOptions()
+                        {
+                            AccountId = account.Id,
+                            Type = MailSynchronizationType.FullFolders
+                        };
+
+                        await _synchronizationManager.SynchronizeMailAsync(fullSyncOptions, cancellationToken).ConfigureAwait(false);
+                        _inboxSyncCounters[account.Id] = 0;
+                    }
+                }
+
+                if (!account.IsCalendarAccessGranted)
+                    continue;
+
+                var calendarOptions = new CalendarSynchronizationOptions()
+                {
+                    AccountId = account.Id,
+                    Type = CalendarSynchronizationType.CalendarMetadata
+                };
+
+                await _synchronizationManager.SynchronizeCalendarAsync(calendarOptions, cancellationToken).ConfigureAwait(false);
+            }
+        }
+        finally
+        {
+            if (lockTaken)
+            {
+                _autoSynchronizationSemaphore.Release();
+            }
+        }
+    }
+
     /// <summary>
     /// Handles activation redirected from another instance (single-instancing).
     /// This is called when a second instance tries to launch and redirects to this existing instance.
diff --git a/Wino.Mail.WinUI/Services/PreferencesService.cs b/Wino.Mail.WinUI/Services/PreferencesService.cs
index b6171b64..8b930750 100644
--- a/Wino.Mail.WinUI/Services/PreferencesService.cs
+++ b/Wino.Mail.WinUI/Services/PreferencesService.cs
@@ -50,12 +50,6 @@ public class PreferencesService(IConfigurationService configurationService) : Ob
         set => SetPropertyAndSave(nameof(MailItemDisplayMode), value);
     }
 
-    public bool IsSemanticZoomEnabled
-    {
-        get => _configurationService.Get(nameof(IsSemanticZoomEnabled), true);
-        set => SetPropertyAndSave(nameof(IsSemanticZoomEnabled), value);
-    }
-
     public bool IsHardDeleteProtectionEnabled
     {
         get => _configurationService.Get(nameof(IsHardDeleteProtectionEnabled), true);