Calendar invitations for Mail part of the app.

Wino.Authentication/OutlookAuthenticator.cs

@@ -98,7 +98,8 @@ public class OutlookAuthenticator : BaseAuthenticator, IOutlookAuthenticator
         catch (MsalUiRequiredException)
         {
             // Somehow MSAL is not able to refresh the token silently.
-            // Force interactive login.
+            // Force interactive login which will include calendar scopes.
+            // The calling code should update account.IsCalendarAccessGranted = true after successful authentication.
 
             return await GenerateTokenInformationAsync(account);
         }

Wino.Calendar.ViewModels/CalendarAppShellViewModel.cs

@@ -27,17 +27,13 @@ public partial class CalendarAppShellViewModel : CalendarBaseViewModel,
     IRecipient<VisibleDateRangeChangedMessage>,
     IRecipient<CalendarEnableStatusChangedMessage>,
     IRecipient<NavigateManageAccountsRequested>,
-    IRecipient<CalendarDisplayTypeChangedMessage>,
-    IRecipient<DetailsPageStateChangedMessage>
+    IRecipient<CalendarDisplayTypeChangedMessage>
 {
     public IPreferencesService PreferencesService { get; }
     public IStatePersistanceService StatePersistenceService { get; }
     public IAccountCalendarStateService AccountCalendarStateService { get; }
     public INavigationService NavigationService { get; }
 
-    [ObservableProperty]
-    private bool _isEventDetailsPageActive;
-
     [ObservableProperty]
     private int _selectedMenuItemIndex = -1;
 
@@ -303,7 +299,6 @@ public partial class CalendarAppShellViewModel : CalendarBaseViewModel,
         Messenger.Register<CalendarEnableStatusChangedMessage>(this);
         Messenger.Register<NavigateManageAccountsRequested>(this);
         Messenger.Register<CalendarDisplayTypeChangedMessage>(this);
-        Messenger.Register<DetailsPageStateChangedMessage>(this);
     }
 
     protected override void UnregisterRecipients()
@@ -314,7 +309,6 @@ public partial class CalendarAppShellViewModel : CalendarBaseViewModel,
         Messenger.Unregister<CalendarEnableStatusChangedMessage>(this);
         Messenger.Unregister<NavigateManageAccountsRequested>(this);
         Messenger.Unregister<CalendarDisplayTypeChangedMessage>(this);
-        Messenger.Unregister<DetailsPageStateChangedMessage>(this);
     }
 
     public void Receive(VisibleDateRangeChangedMessage message) => HighlightedDateRange = message.DateRange;
@@ -369,16 +363,4 @@ public partial class CalendarAppShellViewModel : CalendarBaseViewModel,
     public void Receive(NavigateManageAccountsRequested message) => SelectedMenuItemIndex = 1;
 
     public void Receive(CalendarDisplayTypeChangedMessage message) => OnPropertyChanged(nameof(IsVerticalCalendar));
-
-    public async void Receive(DetailsPageStateChangedMessage message)
-    {
-        await ExecuteUIThread(() =>
-        {
-            IsEventDetailsPageActive = message.IsActivated;
-
-            // TODO: This is for Wino Mail. Generalize this later on.
-            StatePersistenceService.IsReaderNarrowed = message.IsActivated;
-            StatePersistenceService.IsReadingMail = message.IsActivated;
-        });
-    }
 }

Wino.Calendar.ViewModels/EventDetailsPageViewModel.cs

@@ -173,14 +173,29 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
     {
         base.OnNavigatedTo(mode, parameters);
 
-        Messenger.Send(new DetailsPageStateChangedMessage(true));
-
         if (parameters == null || parameters is not CalendarItemTarget args)
             return;
 
         await LoadCalendarItemTargetAsync(args);
     }
 
+    protected override async void OnCalendarItemUpdated(CalendarItem calendarItem)
+    {
+        base.OnCalendarItemUpdated(calendarItem);
+
+        // If the current event was updated, reload it
+        if (CurrentEvent?.CalendarItem?.Id == calendarItem.Id || CurrentEvent?.CalendarItem.RecurringCalendarItemId == calendarItem.Id)
+        {
+            // Refresh the current event data by reloading from service
+            var refreshedEvent = await _calendarService.GetCalendarItemAsync(calendarItem.Id);
+            if (refreshedEvent != null)
+            {
+                CurrentEvent = new CalendarItemViewModel(refreshedEvent);
+                await LoadAttendeesAsync(refreshedEvent.EventTrackingId, refreshedEvent);
+            }
+        }
+    }
+
     protected override void OnCalendarItemDeleted(CalendarItem calendarItem)
     {
         base.OnCalendarItemDeleted(calendarItem);
@@ -205,6 +220,9 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
 
             await LoadAttendeesAsync(currentEventItem.EventTrackingId, currentEventItem);
 
+            // Initialize SelectedShowAsOption based on current event's ShowAs
+            SelectedShowAsOption = ShowAsOptions.FirstOrDefault(o => o.ShowAs == currentEventItem.ShowAs) ?? ShowAsOptions[2];
+
             // Load reminders for this calendar item
             Reminders = await _calendarService.GetRemindersAsync(currentEventItem.EventTrackingId);
             InitializeReminderOptions();
@@ -221,15 +239,21 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
     private async Task LoadAttendeesAsync(Guid eventTrackingId, CalendarItem calendarItem)
     {
         CurrentEvent.Attendees.Clear();
-        
+
         var attendees = await _calendarService.GetAttendeesAsync(eventTrackingId);
 
-        // Check if organizer is in the attendees list
-        var hasOrganizerInList = attendees.Any(a => a.IsOrganizer);
+        // Separate organizer from other attendees to ensure organizer is always first
+        var organizer = attendees.FirstOrDefault(a => a.IsOrganizer);
+        var nonOrganizerAttendees = attendees.Where(a => !a.IsOrganizer).ToList();
 
-        // If the user is the organizer but not in attendees list, add them
-        if (!hasOrganizerInList && !string.IsNullOrEmpty(calendarItem.OrganizerEmail))
+        // If the organizer is in the list, add them first
+        if (organizer != null)
         {
+            CurrentEvent.Attendees.Add(organizer);
+        }
+        else if (!string.IsNullOrEmpty(calendarItem.OrganizerEmail))
+        {
+            // If the organizer is not in the attendees list, create and add them first
             var organizerAttendee = new CalendarEventAttendee
             {
                 Id = Guid.NewGuid(),
@@ -242,7 +266,8 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
             CurrentEvent.Attendees.Add(organizerAttendee);
         }
 
-        foreach (var item in attendees)
+        // Add all other attendees after the organizer
+        foreach (var item in nonOrganizerAttendees)
         {
             CurrentEvent.Attendees.Add(item);
         }
@@ -321,6 +346,10 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
 
         try
         {
+            // Capture original state BEFORE making any changes for potential revert
+            var originalItem = await _calendarService.GetCalendarItemAsync(CurrentEvent.CalendarItem.Id);
+            var originalAttendees = await _calendarService.GetAttendeesAsync(CurrentEvent.CalendarItem.EventTrackingId);
+
             // Get selected reminder options
             var selectedOptions = ReminderOptions.Where(o => o.IsSelected).ToList();
 
@@ -344,12 +373,35 @@ public partial class EventDetailsPageViewModel : CalendarBaseViewModel
             await _calendarService.SaveRemindersAsync(CurrentEvent.CalendarItem.EventTrackingId, newReminders);
             Reminders = newReminders;
 
+            // Update ShowAs if changed
+            if (SelectedShowAsOption != null)
+            {
+                CurrentEvent.CalendarItem.ShowAs = SelectedShowAsOption.ShowAs;
+            }
+
+            // Update the calendar item and attendees in database
+            await _calendarService.UpdateCalendarItemAsync(CurrentEvent.CalendarItem, CurrentEvent.Attendees.ToList());
+
+            // Queue the update request to synchronizer with original state for revert capability
+            var preparationRequest = new CalendarOperationPreparationRequest(
+                CalendarSynchronizerOperation.UpdateEvent,
+                CurrentEvent.CalendarItem,
+                CurrentEvent.Attendees.ToList(),
+                ResponseMessage: null,
+                OriginalItem: originalItem,
+                OriginalAttendees: originalAttendees);
+
+            await _winoRequestDelegator.ExecuteAsync(preparationRequest);
+
             _navigationService.GoBack();
-            // TODO: Implement saving other event details
         }
         catch (Exception ex)
         {
             Debug.WriteLine($"Error saving event: {ex.Message}");
+            _dialogService.InfoBarMessage(
+                Translator.Info_AttachmentSaveFailedTitle,
+                ex.Message,
+                InfoBarMessageType.Error);
         }
     }
 

Wino.Core.Domain/Entities/Calendar/CalendarItem.cs

@@ -140,6 +140,12 @@ public class CalendarItem : ICalendarItem
     public string HtmlLink { get; set; }
     public CalendarItemStatus Status { get; set; }
     public CalendarItemVisibility Visibility { get; set; }
+    
+    /// <summary>
+    /// Indicates how the event should be shown in the calendar (Free, Busy, Tentative, etc.).
+    /// </summary>
+    public CalendarItemShowAs ShowAs { get; set; } = CalendarItemShowAs.Busy;
+    
     public DateTimeOffset CreatedAt { get; set; }
     public DateTimeOffset UpdatedAt { get; set; }
     public Guid CalendarId { get; set; }

Wino.Core.Domain/Entities/Mail/MailCopy.cs

@@ -103,6 +103,11 @@ public class MailCopy
     /// </summary>
     public bool HasAttachments { get; set; }
 
+    /// <summary>
+    /// Type of mail item (regular mail, calendar invitation, calendar response, etc.).
+    /// </summary>
+    public MailItemType ItemType { get; set; } = MailItemType.Mail;
+
     /// <summary>
     /// Assigned draft id.
     /// </summary>

Wino.Core.Domain/Entities/Shared/MailAccount.cs

@@ -78,6 +78,14 @@ public class MailAccount
     /// </summary>
     public SpecialImapProvider SpecialImapProvider { get; set; }
 
+    /// <summary>
+    /// Gets or sets whether calendar access is granted for this account.
+    /// When false, synchronizers will not process EventMessages or calendar invitations.
+    /// Default is false for existing accounts to prevent scope issues.
+    /// New accounts created after this feature will have this set to true.
+    /// </summary>
+    public bool IsCalendarAccessGranted { get; set; }
+
     /// <summary>
     /// Contains the merged inbox this account belongs to.
     /// Ignored for all SQLite operations.

Wino.Core.Domain/Enums/MailItemType.cs

@@ -0,0 +1,27 @@
+namespace Wino.Core.Domain.Enums;
+
+/// <summary>
+/// Represents the type of mail item.
+/// </summary>
+public enum MailItemType
+{
+    /// <summary>
+    /// Regular mail message.
+    /// </summary>
+    Mail = 0,
+
+    /// <summary>
+    /// Calendar invitation (meeting request).
+    /// </summary>
+    CalendarInvitation = 1,
+
+    /// <summary>
+    /// Calendar response (meeting accepted, tentatively accepted, or declined).
+    /// </summary>
+    CalendarResponse = 2,
+
+    /// <summary>
+    /// Calendar cancellation (meeting cancelled).
+    /// </summary>
+    CalendarCancellation = 3
+}

Wino.Core.Domain/Models/Calendar/CalendarOperationPreparationRequest.cs

@@ -11,4 +11,12 @@ namespace Wino.Core.Domain.Models.Calendar;
 /// <param name="CalendarItem">Calendar item to operate on.</param>
 /// <param name="Attendees">List of attendees for the calendar event.</param>
 /// <param name="ResponseMessage">Optional message to include with event responses (Accept, Decline, Tentative).</param>
-public record CalendarOperationPreparationRequest(CalendarSynchronizerOperation Operation, CalendarItem CalendarItem, List<CalendarEventAttendee> Attendees, string ResponseMessage = null);
+/// <param name="OriginalItem">Original calendar item state before update (for revert capability).</param>
+/// <param name="OriginalAttendees">Original attendees list before update (for revert capability).</param>
+public record CalendarOperationPreparationRequest(
+    CalendarSynchronizerOperation Operation,
+    CalendarItem CalendarItem,
+    List<CalendarEventAttendee> Attendees,
+    string ResponseMessage = null,
+    CalendarItem OriginalItem = null,
+    List<CalendarEventAttendee> OriginalAttendees = null);

Wino.Core/Extensions/OutlookIntegratorExtensions.cs

@@ -60,7 +60,8 @@ public static class OutlookIntegratorExtensions
             FromName = outlookMessage.From?.EmailAddress?.Name,
             FromAddress = outlookMessage.From?.EmailAddress?.Address,
             Subject = outlookMessage.Subject,
-            FileId = Guid.NewGuid()
+            FileId = Guid.NewGuid(),
+            ItemType = MailItemType.Mail // ItemType will be set by caller if calendar access is granted
         };
 
         if (mailCopy.IsDraft)
@@ -69,6 +70,51 @@ public static class OutlookIntegratorExtensions
         return mailCopy;
     }
 
+    public static MailItemType GetMailItemType(this Message message)
+    {
+        // Check if the message is an EventMessage (calendar-related)
+        if (message is EventMessage eventMessage)
+        {
+            // Try to get MeetingMessageType from the property
+            if (eventMessage.MeetingMessageType.HasValue)
+            {
+                return eventMessage.MeetingMessageType.Value switch
+                {
+                    MeetingMessageType.MeetingRequest => MailItemType.CalendarInvitation,
+                    MeetingMessageType.MeetingCancelled => MailItemType.CalendarCancellation,
+                    MeetingMessageType.MeetingAccepted or
+                    MeetingMessageType.MeetingTenativelyAccepted or
+                    MeetingMessageType.MeetingDeclined => MailItemType.CalendarResponse,
+                    _ => MailItemType.Mail
+                };
+            }
+
+            // Fallback: Check @odata.type in AdditionalData to determine specific type
+            if (message.AdditionalData?.TryGetValue("@odata.type", out var odataType) == true)
+            {
+                var odataTypeString = odataType?.ToString();
+                if (odataTypeString != null)
+                {
+                    // eventMessageRequest -> CalendarInvitation
+                    if (odataTypeString.Contains("eventMessageRequest", StringComparison.OrdinalIgnoreCase))
+                        return MailItemType.CalendarInvitation;
+
+                    // eventMessageResponse -> CalendarResponse
+                    if (odataTypeString.Contains("eventMessageResponse", StringComparison.OrdinalIgnoreCase))
+                        return MailItemType.CalendarResponse;
+
+                    // Generic eventMessage without specific type - assume invitation
+                    if (odataTypeString.Contains("eventMessage", StringComparison.OrdinalIgnoreCase))
+                        return MailItemType.CalendarInvitation;
+                }
+            }
+
+            return MailItemType.CalendarInvitation;
+        }
+
+        return MailItemType.Mail;
+    }
+
     public static Message AsOutlookMessage(this MimeMessage mime, bool includeInternetHeaders, string conversationId = null)
     {
         var fromAddress = GetRecipients(mime.From).ElementAt(0);
@@ -286,7 +332,7 @@ public static class OutlookIntegratorExtensions
     public static CalendarEventAttendee CreateAttendee(this Attendee attendee, Guid calendarItemId, string organizerEmail = null)
     {
         // Check if this attendee is the organizer by comparing email addresses
-        bool isOrganizer = !string.IsNullOrEmpty(organizerEmail) && 
+        bool isOrganizer = !string.IsNullOrEmpty(organizerEmail) &&
                           !string.IsNullOrEmpty(attendee?.EmailAddress?.Address) &&
                           string.Equals(attendee.EmailAddress.Address, organizerEmail, StringComparison.OrdinalIgnoreCase);
 

Wino.Core/Integration/Processors/GmailChangeProcessor.cs

@@ -111,6 +111,7 @@ public class GmailChangeProcessor : DefaultChangeProcessor, IGmailChangeProcesso
                     Title = string.IsNullOrEmpty(calendarEvent.Summary) ? parentRecurringEvent.Title : calendarEvent.Summary,
                     UpdatedAt = DateTimeOffset.UtcNow,
                     Visibility = string.IsNullOrEmpty(calendarEvent.Visibility) ? parentRecurringEvent.Visibility : GetVisibility(calendarEvent.Visibility),
+                    ShowAs = string.IsNullOrEmpty(calendarEvent.Transparency) ? parentRecurringEvent.ShowAs : GetShowAs(calendarEvent.Transparency),
                     HtmlLink = string.IsNullOrEmpty(calendarEvent.HtmlLink) ? parentRecurringEvent.HtmlLink : calendarEvent.HtmlLink,
                     RemoteEventId = calendarEvent.Id,
                     IsLocked = calendarEvent.Locked.GetValueOrDefault(),
@@ -148,6 +149,7 @@ public class GmailChangeProcessor : DefaultChangeProcessor, IGmailChangeProcesso
                     Title = calendarEvent.Summary,
                     UpdatedAt = DateTimeOffset.UtcNow,
                     Visibility = GetVisibility(calendarEvent.Visibility),
+                    ShowAs = GetShowAs(calendarEvent.Transparency),
                     HtmlLink = calendarEvent.HtmlLink,
                     RemoteEventId = calendarEvent.Id,
                     IsLocked = calendarEvent.Locked.GetValueOrDefault(),
@@ -429,6 +431,20 @@ public class GmailChangeProcessor : DefaultChangeProcessor, IGmailChangeProcesso
         };
     }
 
+    private CalendarItemShowAs GetShowAs(string transparency)
+    {
+        /// Google Calendar uses "transparent" for free time (event doesn't block time) 
+        /// and "opaque" for busy time (event blocks time on the calendar).
+        /// If not specified, defaults to opaque (busy).
+
+        return transparency switch
+        {
+            "transparent" => CalendarItemShowAs.Free,
+            "opaque" => CalendarItemShowAs.Busy,
+            _ => CalendarItemShowAs.Busy
+        };
+    }
+
     public Task<bool> HasAccountAnyDraftAsync(Guid accountId)
         => MailService.HasAccountAnyDraftAsync(accountId);
 

Wino.Core/Integration/Processors/OutlookChangeProcessor.cs

@@ -135,6 +135,24 @@ public class OutlookChangeProcessor(IDatabaseService databaseService,
             savingItem.Visibility = CalendarItemVisibility.Public;
         }
 
+        // Set ShowAs status
+        if (calendarEvent.ShowAs != null)
+        {
+            savingItem.ShowAs = calendarEvent.ShowAs.Value switch
+            {
+                Microsoft.Graph.Models.FreeBusyStatus.Free => CalendarItemShowAs.Free,
+                Microsoft.Graph.Models.FreeBusyStatus.Tentative => CalendarItemShowAs.Tentative,
+                Microsoft.Graph.Models.FreeBusyStatus.Busy => CalendarItemShowAs.Busy,
+                Microsoft.Graph.Models.FreeBusyStatus.Oof => CalendarItemShowAs.OutOfOffice,
+                Microsoft.Graph.Models.FreeBusyStatus.WorkingElsewhere => CalendarItemShowAs.WorkingElsewhere,
+                _ => CalendarItemShowAs.Busy
+            };
+        }
+        else
+        {
+            savingItem.ShowAs = CalendarItemShowAs.Busy;
+        }
+
         // Set IsLocked based on whether the user is the organizer
         // Read-only events are those where the current user is not the organizer
         savingItem.IsLocked = calendarEvent.IsOrganizer.HasValue && !calendarEvent.IsOrganizer.Value;

Wino.Core/Requests/Calendar/UpdateCalendarEventRequest.cs

@@ -0,0 +1,53 @@
+using System.Collections.Generic;
+using CommunityToolkit.Mvvm.Messaging;
+using Wino.Core.Domain.Entities.Calendar;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Models.Requests;
+using Wino.Messaging.Client.Calendar;
+
+namespace Wino.Core.Requests.Calendar;
+
+/// <summary>
+/// Request to update an existing calendar event on the server.
+/// The calendar item should be already updated in the local database before queuing this request.
+/// </summary>
+public record UpdateCalendarEventRequest(CalendarItem Item, List<CalendarEventAttendee> Attendees) : CalendarRequestBase(Item)
+{
+    /// <summary>
+    /// Original attendees before the update, used for reverting changes if the update fails.
+    /// </summary>
+    public List<CalendarEventAttendee> OriginalAttendees { get; init; }
+
+    /// <summary>
+    /// Original calendar item state before the update, used for reverting changes if the update fails.
+    /// </summary>
+    public CalendarItem OriginalItem { get; init; }
+
+    public override CalendarSynchronizerOperation Operation => CalendarSynchronizerOperation.UpdateEvent;
+
+    /// <summary>
+    /// After successful update, we need to resync to ensure changes are properly reflected.
+    /// </summary>
+    public override int ResynchronizationDelay => 2000;
+
+    public override void ApplyUIChanges()
+    {
+        // Notify UI that the event was updated locally
+        WeakReferenceMessenger.Default.Send(new CalendarItemUpdated(Item));
+    }
+
+    public override void RevertUIChanges()
+    {
+        // If update fails, restore the original state
+        if (OriginalItem != null && OriginalAttendees != null)
+        {
+            // Send the original item back to restore UI state
+            WeakReferenceMessenger.Default.Send(new CalendarItemUpdated(OriginalItem));
+        }
+        else
+        {
+            // Fallback: just notify with current item to trigger refresh
+            WeakReferenceMessenger.Default.Send(new CalendarItemUpdated(Item));
+        }
+    }
+}

Wino.Core/Services/WinoRequestDelegator.cs

@@ -145,8 +145,11 @@ public class WinoRequestDelegator : IWinoRequestDelegator
             CalendarSynchronizerOperation.AcceptEvent => new AcceptEventRequest(calendarPreparationRequest.CalendarItem, calendarPreparationRequest.ResponseMessage),
             CalendarSynchronizerOperation.DeclineEvent => CreateDeclineRequest(calendarPreparationRequest.CalendarItem, calendarPreparationRequest.ResponseMessage),
             CalendarSynchronizerOperation.TentativeEvent => new TentativeEventRequest(calendarPreparationRequest.CalendarItem, calendarPreparationRequest.ResponseMessage),
-            // Future support for update operations
-            // CalendarSynchronizerOperation.UpdateEvent => new UpdateCalendarEventRequest(calendarPreparationRequest.CalendarItem, calendarPreparationRequest.Attendees),
+            CalendarSynchronizerOperation.UpdateEvent => new UpdateCalendarEventRequest(calendarPreparationRequest.CalendarItem, calendarPreparationRequest.Attendees)
+            {
+                OriginalItem = calendarPreparationRequest.OriginalItem,
+                OriginalAttendees = calendarPreparationRequest.OriginalAttendees
+            },
             _ => throw new NotImplementedException($"Calendar operation {calendarPreparationRequest.Operation} is not implemented yet.")
         };
 

Wino.Core/Synchronizers/GmailSynchronizer.cs

@@ -1561,6 +1561,9 @@ public class GmailSynchronizer : WinoSynchronizer<IClientServiceRequest, Message
         var fromHeaderValue = gmailMessage.Payload?.Headers?.FirstOrDefault(h => h.Name.Equals("From", StringComparison.OrdinalIgnoreCase))?.Value ?? "";
         var (fromName, fromAddress) = ExtractNameAndEmailFromHeader(fromHeaderValue);
 
+        // Detect calendar invitation by checking Content-Type header (only if calendar access granted)
+        var itemType = Account.IsCalendarAccessGranted ? GetMailItemTypeFromHeaders(gmailMessage.Payload?.Headers) : MailItemType.Mail;
+
         var copy = new MailCopy()
         {
             CreationDate = creationDate,
@@ -1579,7 +1582,8 @@ public class GmailSynchronizer : WinoSynchronizer<IClientServiceRequest, Message
             InReplyTo = gmailMessage.Payload?.Headers?.FirstOrDefault(h => h.Name.Equals("In-Reply-To", StringComparison.OrdinalIgnoreCase))?.Value,
             MessageId = gmailMessage.Payload?.Headers?.FirstOrDefault(h => h.Name.Equals("Message-Id", StringComparison.OrdinalIgnoreCase))?.Value,
             References = gmailMessage.Payload?.Headers?.FirstOrDefault(h => h.Name.Equals("References", StringComparison.OrdinalIgnoreCase))?.Value,
-            FileId = Guid.NewGuid()
+            FileId = Guid.NewGuid(),
+            ItemType = itemType
         };
 
         // Set DraftId if this is a draft
@@ -1589,6 +1593,47 @@ public class GmailSynchronizer : WinoSynchronizer<IClientServiceRequest, Message
         return Task.FromResult(copy);
     }
 
+    /// <summary>
+    /// Determines MailItemType based on Gmail message headers.
+    /// Gmail doesn't have EventMessage type like Outlook, but calendar invitations can be detected
+    /// by checking Content-Type header for text/calendar or multipart/alternative with text/calendar part.
+    /// </summary>
+    private static MailItemType GetMailItemTypeFromHeaders(IList<MessagePartHeader> headers)
+    {
+        if (headers == null) return MailItemType.Mail;
+
+        // Check Content-Type header for text/calendar
+        var contentTypeHeader = headers.FirstOrDefault(h => h.Name.Equals("Content-Type", StringComparison.OrdinalIgnoreCase))?.Value;
+        
+        if (!string.IsNullOrEmpty(contentTypeHeader))
+        {
+            // Check if it's a calendar message (text/calendar or multipart with calendar)
+            if (contentTypeHeader.Contains("text/calendar", StringComparison.OrdinalIgnoreCase))
+            {
+                // Check the METHOD parameter to determine invitation type
+                var methodMatch = System.Text.RegularExpressions.Regex.Match(contentTypeHeader, @"method=([^;\s]+)", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
+                
+                if (methodMatch.Success)
+                {
+                    var method = methodMatch.Groups[1].Value.Trim('"').ToUpperInvariant();
+                    
+                    return method switch
+                    {
+                        "REQUEST" => MailItemType.CalendarInvitation,
+                        "CANCEL" => MailItemType.CalendarCancellation,
+                        "REPLY" => MailItemType.CalendarResponse,
+                        _ => MailItemType.Mail
+                    };
+                }
+                
+                // If no method specified, assume it's an invitation
+                return MailItemType.CalendarInvitation;
+            }
+        }
+
+        return MailItemType.Mail;
+    }
+
     /// <summary>
     /// Extracts name and email address from a header value like "Name <email@domain.com>" or "email@domain.com"
     /// </summary>
@@ -1849,6 +1894,87 @@ public class GmailSynchronizer : WinoSynchronizer<IClientServiceRequest, Message
         return [new HttpRequestBundle<IClientServiceRequest>(patchRequest, request)];
     }
 
+    public override List<IRequestBundle<IClientServiceRequest>> UpdateCalendarEvent(UpdateCalendarEventRequest request)
+    {
+        var calendarItem = request.Item;
+        var attendees = request.Attendees;
+
+        // Get the calendar for this event
+        var calendar = calendarItem.AssignedCalendar;
+        if (calendar == null)
+        {
+            throw new InvalidOperationException("Calendar item must have an assigned calendar");
+        }
+
+        if (string.IsNullOrEmpty(calendarItem.RemoteEventId))
+        {
+            throw new InvalidOperationException("Cannot update event without remote event ID");
+        }
+
+        // Convert CalendarItem to Google Event for update
+        var googleEvent = new Event
+        {
+            Summary = calendarItem.Title,
+            Description = calendarItem.Description,
+            Location = calendarItem.Location,
+            Status = calendarItem.Status == CalendarItemStatus.Accepted ? "confirmed" : "tentative",
+            Transparency = calendarItem.ShowAs == CalendarItemShowAs.Free ? "transparent" : "opaque"
+        };
+
+        // Set start and end time with proper timezone handling
+        // CalendarItem stores dates in the event's timezone (StartTimeZone/EndTimeZone)
+        // When user edits in local timezone, the dates are already converted and stored correctly
+        if (calendarItem.IsAllDayEvent)
+        {
+            // All-day events use Date instead of DateTime
+            googleEvent.Start = new EventDateTime
+            {
+                Date = calendarItem.StartDate.ToString("yyyy-MM-dd")
+            };
+            googleEvent.End = new EventDateTime
+            {
+                Date = calendarItem.EndDate.ToString("yyyy-MM-dd")
+            };
+        }
+        else
+        {
+            // Regular events with time
+            // StartDate and EndDate are stored in the event's timezone
+            // We preserve the timezone information during update
+            googleEvent.Start = new EventDateTime
+            {
+                DateTimeDateTimeOffset = new DateTimeOffset(calendarItem.StartDate, TimeSpan.Zero),
+                TimeZone = calendarItem.StartTimeZone ?? TimeZoneInfo.Local.Id
+            };
+            googleEvent.End = new EventDateTime
+            {
+                DateTimeDateTimeOffset = new DateTimeOffset(calendarItem.EndDate, TimeSpan.Zero),
+                TimeZone = calendarItem.EndTimeZone ?? TimeZoneInfo.Local.Id
+            };
+        }
+
+        // Add attendees if any
+        if (attendees != null && attendees.Count > 0)
+        {
+            googleEvent.Attendees = attendees.Select(a => new EventAttendee
+            {
+                Email = a.Email,
+                DisplayName = a.Name,
+                Optional = a.IsOptionalAttendee
+            }).ToList();
+        }
+
+        // Update the event using Google Calendar API
+        var updateRequest = _calendarService.Events.Update(googleEvent, calendar.RemoteCalendarId, calendarItem.RemoteEventId);
+
+        // Send notifications to attendees if the event has attendees
+        updateRequest.SendUpdates = (attendees != null && attendees.Count > 0) 
+            ? Google.Apis.Calendar.v3.EventsResource.UpdateRequest.SendUpdatesEnum.All 
+            : Google.Apis.Calendar.v3.EventsResource.UpdateRequest.SendUpdatesEnum.None;
+
+        return [new HttpRequestBundle<IClientServiceRequest>(updateRequest, request)];
+    }
+
     #endregion
 
     public override async Task KillSynchronizerAsync()

Wino.Core/Synchronizers/OutlookSynchronizer.cs

@@ -210,6 +210,17 @@ public class OutlookSynchronizer : WinoSynchronizer<RequestInformation, Message,
             config.QueryParameters.Select = outlookMessageSelectParameters;
         }, cancellationToken).ConfigureAwait(false);
 
+        // Check if this is an EventMessage and fetch it separately if needed (only if calendar access granted)
+        if (Account.IsCalendarAccessGranted && message is EventMessage)
+        {
+            message = await FetchEventMessageAsync(message.Id, cancellationToken).ConfigureAwait(false);
+            if (message == null)
+            {
+                _logger.Warning("Failed to fetch EventMessage {MessageId}, skipping", messageId);
+                return;
+            }
+        }
+
         var mailPackages = await CreateNewMailPackagesAsync(message, assignedFolder, cancellationToken).ConfigureAwait(false);
 
         if (mailPackages == null) return;
@@ -291,6 +302,16 @@ public class OutlookSynchronizer : WinoSynchronizer<RequestInformation, Message,
 
                     if (!IsResourceDeleted(message.AdditionalData) && !IsNotRealMessageType(message))
                     {
+                        // Check if this is an EventMessage and fetch it separately if needed (only if calendar access granted)
+                        if (Account.IsCalendarAccessGranted && message is EventMessage)
+                        {
+                            message = await FetchEventMessageAsync(message.Id, cancellationToken).ConfigureAwait(false);
+                            if (message == null)
+                            {
+                                return true; // Skip this message if fetch failed
+                            }
+                        }
+
                         // Check if message already exists
                         bool mailExists = await _outlookChangeProcessor.IsMailExistsInFolderAsync(message.Id, folder.Id).ConfigureAwait(false);
 
@@ -567,6 +588,12 @@ public class OutlookSynchronizer : WinoSynchronizer<RequestInformation, Message,
         mailCopy.UniqueId = Guid.NewGuid();
         mailCopy.FileId = Guid.NewGuid();
 
+        // Set ItemType based on calendar access permissions
+        if (Account.IsCalendarAccessGranted && message is EventMessage)
+        {
+            mailCopy.ItemType = message.GetMailItemType();
+        }
+
         // Check for draft mapping if this is a draft with WinoLocalDraftHeader
         if (message.IsDraft.GetValueOrDefault() && message.InternetMessageHeaders != null)
         {
@@ -604,6 +631,28 @@ public class OutlookSynchronizer : WinoSynchronizer<RequestInformation, Message,
     private string GetDeltaTokenFromDeltaLink(string deltaLink)
         => Regex.Split(deltaLink, "deltatoken=")[1];
 
+    /// <summary>
+    /// Determines MailItemType based on EventMessage's MeetingMessageType.
+    /// </summary>
+    private static MailItemType GetMailItemType(EventMessage eventMessage)
+    {
+        if (eventMessage.MeetingMessageType.HasValue)
+        {
+            return eventMessage.MeetingMessageType.Value switch
+            {
+                MeetingMessageType.MeetingRequest => MailItemType.CalendarInvitation,
+                MeetingMessageType.MeetingCancelled => MailItemType.CalendarCancellation,
+                MeetingMessageType.MeetingAccepted or
+                MeetingMessageType.MeetingTenativelyAccepted or
+                MeetingMessageType.MeetingDeclined => MailItemType.CalendarResponse,
+                _ => MailItemType.Mail
+            };
+        }
+
+        // Fallback to CalendarInvitation if type is unknown
+        return MailItemType.CalendarInvitation;
+    }
+
     protected override async Task<MailCopy> CreateMinimalMailCopyAsync(Message message, MailItemFolder assignedFolder, CancellationToken cancellationToken = default)
     {
         // Use centralized method
@@ -614,10 +663,18 @@ public class OutlookSynchronizer : WinoSynchronizer<RequestInformation, Message,
     {
         try
         {
-            return await _graphClient.Me.Messages[messageId].GetAsync((config) =>
+            var message = await _graphClient.Me.Messages[messageId].GetAsync((config) =>
             {
                 config.QueryParameters.Select = outlookMessageSelectParameters;
             }, cancellationToken).ConfigureAwait(false);
+
+            // Check if this is an EventMessage and fetch it separately if needed (only if calendar access granted)
+            if (Account.IsCalendarAccessGranted && message is EventMessage)
+            {
+                message = await FetchEventMessageAsync(message.Id, cancellationToken).ConfigureAwait(false);
+            }
+
+            return message;
         }
         catch (ServiceException serviceException)
         {
@@ -738,6 +795,36 @@ public class OutlookSynchronizer : WinoSynchronizer<RequestInformation, Message,
     private bool IsResourceDeleted(IDictionary<string, object> additionalData)
         => additionalData != null && additionalData.ContainsKey("@removed");
 
+    /// <summary>
+    /// Fetches an EventMessage with full details including MeetingMessageType from the Messages endpoint.
+    /// This is necessary because MeetingMessageType is not available when fetching as Message type.
+    /// </summary>
+    private async Task<EventMessage> FetchEventMessageAsync(string messageId, CancellationToken cancellationToken)
+    {
+        try
+        {
+            var requestInfo = _graphClient.Me.Messages[messageId].ToGetRequestInformation((config) =>
+            {
+                config.QueryParameters.Select = outlookMessageSelectParameters.Concat(["MeetingMessageType"]).ToArray();
+            });
+
+            var eventMessage = await _graphClient.Me.Messages[messageId].GetAsync(cancellationToken: cancellationToken).ConfigureAwait(false);
+
+            var odataType = eventMessage?.AdditionalData?.ContainsKey("@odata.type") == true
+                ? eventMessage.AdditionalData["@odata.type"]?.ToString()
+                : "unknown";
+
+            _logger.Debug("Fetched EventMessage {MessageId} with type {ODataType}", messageId, odataType);
+
+            return eventMessage as EventMessage;
+        }
+        catch (Exception ex)
+        {
+            _logger.Error(ex, "Failed to fetch EventMessage {MessageId}", messageId);
+            return null;
+        }
+    }
+
     private async Task<bool> HandleFolderRetrievedAsync(MailFolder folder, OutlookSpecialFolderIdInformation outlookSpecialFolderIdInformation, CancellationToken cancellationToken = default)
     {
         if (IsResourceDeleted(folder.AdditionalData))
@@ -785,11 +872,12 @@ public class OutlookSynchronizer : WinoSynchronizer<RequestInformation, Message,
     /// Basically deleted item retention items are stored as Message object in Deleted Items folder.
     /// Suprisingly, odatatype will also be the same as Message.
     /// In order to differentiate them from regular messages, we need to check the addresses in the message.
+    /// EventMessage types (calendar invitations/responses) are now processed as regular mail items with appropriate ItemType.
     /// </summary>
     /// <param name="item">Retrieved message.</param>
     /// <returns>Whether the item is non-Message type or not.</returns>
     private bool IsNotRealMessageType(Message item)
-        => item is EventMessage || item.From?.EmailAddress == null;
+        => item.From?.EmailAddress == null;
 
     private async Task<bool> HandleItemRetrievedAsync(Message item, MailItemFolder folder, IList<string> downloadedMessageIds, CancellationToken cancellationToken = default)
     {
@@ -802,6 +890,16 @@ public class OutlookSynchronizer : WinoSynchronizer<RequestInformation, Message,
         }
         else
         {
+            // Check if this is an EventMessage and fetch it separately if needed (only if calendar access granted)
+            if (Account.IsCalendarAccessGranted && item is EventMessage)
+            {
+                item = await FetchEventMessageAsync(item.Id, cancellationToken).ConfigureAwait(false);
+                if (item == null)
+                {
+                    return true; // Skip this message if fetch failed
+                }
+            }
+
             // If the item exists in the local database, it means that it's already downloaded. Process as an Update.
 
             var isMailExists = await _outlookChangeProcessor.IsMailExistsInFolderAsync(item.Id, folder.Id);
@@ -828,15 +926,9 @@ public class OutlookSynchronizer : WinoSynchronizer<RequestInformation, Message,
             {
                 if (IsNotRealMessageType(item))
                 {
-                    if (item is EventMessage eventMessage)
-                    {
-                        Log.Warning("Recieved event message. This is not supported yet. {Id}", eventMessage.Id);
-                    }
-                    else
-                    {
-                        Log.Warning("Recieved either contact or todo item as message This is not supported yet. {Id}", item.Id);
-                    }
-
+                    // EventMessages are handled above if calendar access is granted
+                    // This catches non-message types like contacts or todo items
+                    Log.Warning("Received non-message item type (contact/todo). This is not supported yet. {Id}", item.Id);
                     return true;
                 }
 
@@ -1914,16 +2006,18 @@ public class OutlookSynchronizer : WinoSynchronizer<RequestInformation, Message,
         else
         {
             // Regular events with time
+            // StartDate and EndDate are stored in the event's timezone
+            // We preserve the timezone information during creation
             outlookEvent.IsAllDay = false;
             outlookEvent.Start = new Microsoft.Graph.Models.DateTimeTimeZone
             {
                 DateTime = calendarItem.StartDate.ToString("yyyy-MM-ddTHH:mm:ss"),
-                TimeZone = calendarItem.StartTimeZone ?? "UTC"
+                TimeZone = calendarItem.StartTimeZone ?? TimeZoneInfo.Local.Id
             };
             outlookEvent.End = new Microsoft.Graph.Models.DateTimeTimeZone
             {
                 DateTime = calendarItem.EndDate.ToString("yyyy-MM-ddTHH:mm:ss"),
-                TimeZone = calendarItem.EndTimeZone ?? "UTC"
+                TimeZone = calendarItem.EndTimeZone ?? TimeZoneInfo.Local.Id
             };
         }
 
@@ -2021,6 +2115,96 @@ public class OutlookSynchronizer : WinoSynchronizer<RequestInformation, Message,
         return [new HttpRequestBundle<RequestInformation>(tentativelyAcceptRequestInfo, request)];
     }
 
+    public override List<IRequestBundle<RequestInformation>> UpdateCalendarEvent(UpdateCalendarEventRequest request)
+    {
+        var calendarItem = request.Item;
+        var attendees = request.Attendees;
+
+        // Get the calendar for this event
+        var calendar = calendarItem.AssignedCalendar;
+        if (calendar == null)
+        {
+            throw new InvalidOperationException("Calendar item must have an assigned calendar");
+        }
+
+        // Convert CalendarItem to Outlook Event for update
+        var outlookEvent = new Microsoft.Graph.Models.Event
+        {
+            Subject = calendarItem.Title,
+            Body = new Microsoft.Graph.Models.ItemBody
+            {
+                ContentType = Microsoft.Graph.Models.BodyType.Text,
+                Content = calendarItem.Description
+            },
+            Location = new Microsoft.Graph.Models.Location
+            {
+                DisplayName = calendarItem.Location
+            },
+            ShowAs = calendarItem.ShowAs switch
+            {
+                CalendarItemShowAs.Free => Microsoft.Graph.Models.FreeBusyStatus.Free,
+                CalendarItemShowAs.Tentative => Microsoft.Graph.Models.FreeBusyStatus.Tentative,
+                CalendarItemShowAs.Busy => Microsoft.Graph.Models.FreeBusyStatus.Busy,
+                CalendarItemShowAs.OutOfOffice => Microsoft.Graph.Models.FreeBusyStatus.Oof,
+                CalendarItemShowAs.WorkingElsewhere => Microsoft.Graph.Models.FreeBusyStatus.WorkingElsewhere,
+                _ => Microsoft.Graph.Models.FreeBusyStatus.Busy
+            }
+        };
+
+        // Set start and end time using DateTimeTimeZone
+        if (calendarItem.IsAllDayEvent)
+        {
+            // All-day events
+            outlookEvent.IsAllDay = true;
+            outlookEvent.Start = new Microsoft.Graph.Models.DateTimeTimeZone
+            {
+                DateTime = calendarItem.StartDate.ToString("yyyy-MM-dd"),
+                TimeZone = "UTC"
+            };
+            outlookEvent.End = new Microsoft.Graph.Models.DateTimeTimeZone
+            {
+                DateTime = calendarItem.EndDate.ToString("yyyy-MM-dd"),
+                TimeZone = "UTC"
+            };
+        }
+        else
+        {
+            // Regular events with time
+            // StartDate and EndDate are stored in the event's timezone
+            // We preserve the timezone information during update
+            outlookEvent.IsAllDay = false;
+            outlookEvent.Start = new Microsoft.Graph.Models.DateTimeTimeZone
+            {
+                DateTime = calendarItem.StartDate.ToString("yyyy-MM-ddTHH:mm:ss"),
+                TimeZone = calendarItem.StartTimeZone ?? TimeZoneInfo.Local.Id
+            };
+            outlookEvent.End = new Microsoft.Graph.Models.DateTimeTimeZone
+            {
+                DateTime = calendarItem.EndDate.ToString("yyyy-MM-ddTHH:mm:ss"),
+                TimeZone = calendarItem.EndTimeZone ?? TimeZoneInfo.Local.Id
+            };
+        }
+
+        // Add attendees if any
+        if (attendees != null && attendees.Count > 0)
+        {
+            outlookEvent.Attendees = attendees.Select(a => new Microsoft.Graph.Models.Attendee
+            {
+                EmailAddress = new Microsoft.Graph.Models.EmailAddress
+                {
+                    Address = a.Email,
+                    Name = a.Name
+                },
+                Type = a.IsOptionalAttendee ? Microsoft.Graph.Models.AttendeeType.Optional : Microsoft.Graph.Models.AttendeeType.Required
+            }).ToList();
+        }
+
+        // Update the event using Graph API
+        var updateRequest = _graphClient.Me.Events[calendarItem.RemoteEventId].ToPatchRequestInformation(outlookEvent);
+
+        return [new HttpRequestBundle<RequestInformation>(updateRequest, request)];
+    }
+
     #endregion
 
     public override async Task KillSynchronizerAsync()

Wino.Core/Synchronizers/WinoSynchronizer.cs

@@ -381,7 +381,7 @@ public abstract class WinoSynchronizer<TBaseRequest, TMessageType, TCalendarEven
                             nativeRequests.AddRange(TentativeEvent(group.ElementAt(0) as TentativeEventRequest));
                             break;
                         case CalendarSynchronizerOperation.UpdateEvent:
-                            // TODO: Implement UpdateCalendarEvent
+                            nativeRequests.AddRange(UpdateCalendarEvent(group.ElementAt(0) as UpdateCalendarEventRequest));
                             break;
                         case CalendarSynchronizerOperation.DeleteEvent:
                             // TODO: Implement DeleteCalendarEvent
@@ -510,6 +510,7 @@ public abstract class WinoSynchronizer<TBaseRequest, TMessageType, TCalendarEven
     #region Calendar Operations
 
     public virtual List<IRequestBundle<TBaseRequest>> CreateCalendarEvent(CreateCalendarEventRequest request) => throw new NotSupportedException(string.Format(Translator.Exception_UnsupportedSynchronizerOperation, this.GetType()));
+    public virtual List<IRequestBundle<TBaseRequest>> UpdateCalendarEvent(UpdateCalendarEventRequest request) => throw new NotSupportedException(string.Format(Translator.Exception_UnsupportedSynchronizerOperation, this.GetType()));
     public virtual List<IRequestBundle<TBaseRequest>> AcceptEvent(AcceptEventRequest request) => throw new NotSupportedException(string.Format(Translator.Exception_UnsupportedSynchronizerOperation, this.GetType()));
     public virtual List<IRequestBundle<TBaseRequest>> DeclineEvent(DeclineEventRequest request) => throw new NotSupportedException(string.Format(Translator.Exception_UnsupportedSynchronizerOperation, this.GetType()));
     public virtual List<IRequestBundle<TBaseRequest>> OutlookDeclineEvent(OutlookDeclineEventRequest request) => throw new NotSupportedException(string.Format(Translator.Exception_UnsupportedSynchronizerOperation, this.GetType()));

Wino.Mail.ViewModels/AccountManagementViewModel.cs

@@ -109,7 +109,8 @@ public partial class AccountManagementViewModel : AccountManagementPageViewModel
                     Name = accountCreationDialogResult.AccountName,
                     SpecialImapProvider = accountCreationDialogResult.SpecialImapProviderDetails?.SpecialImapProvider ?? SpecialImapProvider.None,
                     Id = Guid.NewGuid(),
-                    AccountColorHex = accountCreationDialogResult.AccountColorHex
+                    AccountColorHex = accountCreationDialogResult.AccountColorHex,
+                    IsCalendarAccessGranted = true // New accounts have calendar scopes
                 };
 
                 await creationDialog.ShowDialogAsync(accountCreationCancellationTokenSource);

Wino.Mail.WinUI/Controls/ListView/WinoMailItemTemplateSelector.cs

@@ -1,6 +1,7 @@
 using System;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
+using Wino.Core.Domain.Enums;
 using Wino.Mail.ViewModels.Data;
 
 namespace Wino.Mail.WinUI.Controls.ListView;
@@ -9,11 +10,18 @@ public partial class WinoMailItemTemplateSelector : DataTemplateSelector
 {
     public DataTemplate? SingleMailItemTemplate { get; set; }
     public DataTemplate? ThreadMailItemTemplate { get; set; }
+    public DataTemplate? CalendarMailItemTemplate { get; set; }
 
     protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
     {
-        if (item is MailItemViewModel)
+        if (item is MailItemViewModel mailItemViewModel)
+        {
+            // Check if it's a calendar-related item
+            if (mailItemViewModel.MailCopy.ItemType != MailItemType.Mail && CalendarMailItemTemplate != null)
+                return CalendarMailItemTemplate;
+
             return SingleMailItemTemplate ?? throw new Exception($"Missing template for single mail items.");
+        }
         else if (item is ThreadMailItemViewModel)
             return ThreadMailItemTemplate ?? throw new Exception($"Missing template for thread mail items.");
 

Wino.Mail.WinUI/Services/StatePersistenceService.cs

@@ -59,6 +59,9 @@ public class StatePersistenceService : ObservableObject, IStatePersistanceServic
             if (SetProperty(ref isEventDetailsVisible, value))
             {
                 OnPropertyChanged(nameof(IsBackButtonVisible));
+
+                IsReaderNarrowed = value;
+                IsReadingMail = value;
             }
         }
     }

Wino.Mail.WinUI/Views/Calendar/CalendarAppShell.xaml

@@ -373,7 +373,7 @@
                         <Setter Target="CalendarHostListView.IsEnabled" Value="False" />
                     </VisualState.Setters>
                     <VisualState.StateTriggers>
-                        <StateTrigger IsActive="{x:Bind ViewModel.IsEventDetailsPageActive, Mode=OneWay}" />
+                        <StateTrigger IsActive="{x:Bind ViewModel.StatePersistenceService.IsEventDetailsVisible, Mode=OneWay}" />
                     </VisualState.StateTriggers>
                 </VisualState>
             </VisualStateGroup>

Wino.Mail.WinUI/Views/Mail/MailListPage.xaml

@@ -121,8 +121,32 @@
 
         </DataTemplate>
 
+        <!--  Calendar Mail Item Template (Placeholder for calendar invitations/responses)  -->
+        <DataTemplate x:Key="CalendarMailItemTemplate" x:DataType="viewModelData:MailItemViewModel">
+            <Grid>
+                <TextBlock Text="Calendar invitation" />
+            </Grid>
+            <!--<controls:MailItemDisplayInformationControl
+                x:DefaultBindMode="OneWay"
+                ActionItem="{x:Bind}"
+                Base64ContactPicture="{x:Bind MailCopy.SenderContact.Base64ContactPicture, Mode=OneWay, TargetNullValue=''}"
+                ContextRequested="MailItemContextRequested"
+                CreationDate="{x:Bind CreationDate}"
+                FromAddress="{x:Bind FromAddress}"
+                FromName="{x:Bind FromName}"
+                HasAttachments="{x:Bind HasAttachments, Mode=OneWay}"
+                HoverActionExecuted="MailItemDisplayInformationControl_HoverActionExecuted"
+                IsDraft="{x:Bind IsDraft, Mode=OneWay}"
+                IsFlagged="{x:Bind IsFlagged, Mode=OneWay}"
+                IsRead="{x:Bind IsRead, Mode=OneWay}"
+                IsThumbnailUpdated="{x:Bind ThumbnailUpdatedEvent, Mode=OneWay}"
+                PreviewText="{x:Bind PreviewText, Mode=OneWay}"
+                Subject="{x:Bind Subject, Mode=OneWay}" />-->
+        </DataTemplate>
+
         <listview:WinoMailItemTemplateSelector
             x:Key="MailItemTemplateSelector"
+            CalendarMailItemTemplate="{StaticResource CalendarMailItemTemplate}"
             SingleMailItemTemplate="{StaticResource SingleMailItemTemplate}"
             ThreadMailItemTemplate="{StaticResource ThreadMailItemTemplate}" />
 

Wino.Messages/Client/Calendar/DetailsPageStateChangedMessage.cs

@@ -1,6 +0,0 @@
-namespace Wino.Messaging.Client.Calendar;
-
-/// <summary>
-/// When event details page is activated or deactivated.
-/// </summary>
-public record DetailsPageStateChangedMessage(bool IsActivated);

Wino.Services/AccountService.cs

@@ -12,7 +12,6 @@ using Wino.Core.Domain.Interfaces;
 using Wino.Core.Domain.Models.Accounts;
 using Wino.Messaging.Client.Accounts;
 using Wino.Messaging.UI;
-using Wino.Services.Extensions;
 
 namespace Wino.Services;
 
@@ -21,6 +20,7 @@ public class AccountService : BaseDatabaseService, IAccountService
     public IAuthenticator ExternalAuthenticationAuthenticator { get; set; }
 
     private readonly ISignatureService _signatureService;
+    private readonly IAuthenticationProvider _authenticationProvider;
     private readonly IMimeFileService _mimeFileService;
     private readonly IPreferencesService _preferencesService;
 
@@ -28,10 +28,12 @@ public class AccountService : BaseDatabaseService, IAccountService
 
     public AccountService(IDatabaseService databaseService,
                           ISignatureService signatureService,
+                          IAuthenticationProvider authenticationProvider,
                           IMimeFileService mimeFileService,
                           IPreferencesService preferencesService) : base(databaseService)
     {
         _signatureService = signatureService;
+        _authenticationProvider = authenticationProvider;
         _mimeFileService = mimeFileService;
         _preferencesService = preferencesService;
     }
@@ -59,7 +61,7 @@ public class AccountService : BaseDatabaseService, IAccountService
         var sql = $"UPDATE MailAccount SET MergedInboxId = ? WHERE Id IN ({placeholders})";
         var parameters = new List<object> { mergedInboxId };
         parameters.AddRange(accountIdList.Cast<object>());
-        
+
         await Connection.ExecuteAsync(sql, parameters.ToArray());
 
         WeakReferenceMessenger.Default.Send(new AccountsMenuRefreshRequested());
@@ -193,13 +195,18 @@ public class AccountService : BaseDatabaseService, IAccountService
 
         if (account == null) return;
 
-        //var authenticator = _authenticationProvider.GetAuthenticator(account.ProviderType);
+        var authenticator = _authenticationProvider.GetAuthenticator(account.ProviderType);
 
-        //// This will re-generate token.
-        //var token = await authenticator.GenerateTokenInformationAsync(account);
+        // This will re-generate token with interactive authentication
+        // New authentication will include calendar scopes
+        var token = await authenticator.GenerateTokenInformationAsync(account);
 
-        // TODO: Rest?
-        // Guard.IsNotNull(token);
+        Guard.IsNotNull(token);
+
+        // Enable calendar access since new token includes calendar scopes
+        account.IsCalendarAccessGranted = true;
+
+        await UpdateAccountAsync(account);
     }
 
     private Task<MailAccountPreferences> GetAccountPreferencesAsync(Guid accountId)

Wino.Services/Extensions/MailkitClientExtensions.cs

@@ -111,6 +111,9 @@ public static class MailkitClientExtensions
         // Use InternalDate (server received date) if available, otherwise fall back to Date header (sent date)
         var creationDate = messageSummary.InternalDate?.UtcDateTime ?? mime.Date.UtcDateTime;
 
+        // Detect calendar invitation based on MIME content type
+        var itemType = GetMailItemTypeFromMime(mime);
+
         var copy = new MailCopy()
         {
             Id = messageUid,
@@ -128,12 +131,49 @@ public static class MailkitClientExtensions
             References = mime.References?.GetReferences(),
             InReplyTo = mime.GetInReplyTo(),
             HasAttachments = mime.Attachments.Any(),
-            FileId = Guid.NewGuid()
+            FileId = Guid.NewGuid(),
+            ItemType = itemType
         };
 
         return copy;
     }
 
+    /// <summary>
+    /// Determines MailItemType based on MIME message content type.
+    /// Calendar invitations have text/calendar content type with METHOD parameter.
+    /// </summary>
+    private static MailItemType GetMailItemTypeFromMime(MimeMessage mime)
+    {
+        if (mime == null) return MailItemType.Mail;
+
+        // Check if the message contains text/calendar content
+        var calendarPart = mime.BodyParts.OfType<MimePart>()
+            .FirstOrDefault(p => p.ContentType?.MimeType?.Equals("text/calendar", StringComparison.OrdinalIgnoreCase) == true);
+
+        if (calendarPart != null)
+        {
+            // Check the METHOD parameter to determine invitation type
+            var method = calendarPart.ContentType.Parameters
+                .FirstOrDefault(p => p.Name.Equals("method", StringComparison.OrdinalIgnoreCase))?.Value?.ToUpperInvariant();
+
+            if (!string.IsNullOrEmpty(method))
+            {
+                return method switch
+                {
+                    "REQUEST" => MailItemType.CalendarInvitation,
+                    "CANCEL" => MailItemType.CalendarCancellation,
+                    "REPLY" => MailItemType.CalendarResponse,
+                    _ => MailItemType.Mail
+                };
+            }
+
+            // If no method specified, assume it's an invitation
+            return MailItemType.CalendarInvitation;
+        }
+
+        return MailItemType.Mail;
+    }
+
     // TODO: Name and Address parsing should be handled better.
     // At some point Wino needs better contact management.