I don't know some changes....

Wino.Mail.WinUI/App.xaml.cs

@@ -1,78 +1,50 @@
-using System.Text;
-using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Controls.Primitives;
+using Microsoft.UI.Xaml.Data;
+using Microsoft.UI.Xaml.Input;
 using Microsoft.UI.Xaml.Media;
-using Windows.Storage;
-using Wino.Core.Domain.Interfaces;
-using Wino.Core.Services;
-using Wino.Core.WinUI.Services;
-using Wino.Views;
-using WinUIEx;
-namespace Wino
+using Microsoft.UI.Xaml.Navigation;
+using Microsoft.UI.Xaml.Shapes;
+using Windows.ApplicationModel;
+using Windows.ApplicationModel.Activation;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+
+// To learn more about WinUI, the WinUI project structure,
+// and more about our project templates, see: http://aka.ms/winui-project-info.
+
+namespace Wino.Mail.WinUI
 {
+    /// <summary>
+    /// Provides application-specific behavior to supplement the default Application class.
+    /// </summary>
     public partial class App : Application
     {
-        private WindowEx m_Window;
-        private Frame m_ShellFrame;
-
-        private readonly IApplicationConfiguration _applicationFolderConfiguration;
-
+        /// <summary>
+        /// Initializes the singleton application object.  This is the first line of authored code
+        /// executed, and as such is the logical equivalent of main() or WinMain().
+        /// </summary>
         public App()
         {
-            if (WebAuthenticator.CheckOAuthRedirectionActivation()) return;
-
-            InitializeComponent();
-
-            Services = ConfigureServices();
-
-            _applicationFolderConfiguration = Services.GetService<IApplicationConfiguration>();
-            _logInitializer = Services.GetService<ILogInitializer>();
-
-            ConfigureLogger();
-            ConfigureAppCenter();
-            ConfigurePrelaunch();
-            ConfigureXbox();
-
-            // Make sure the paths are setup on app start.
-            _applicationFolderConfiguration.ApplicationDataFolderPath = ApplicationData.Current.LocalFolder.Path;
-            _applicationFolderConfiguration.PublisherSharedFolderPath = ApplicationData.Current.GetPublisherCacheFolder(ApplicationConfiguration.SharedFolderName).Path;
-
-            _themeService = Services.GetService<IThemeService>();
-            _databaseService = Services.GetService<IDatabaseService>();
-            _translationService = Services.GetService<ITranslationService>();
-            _appShellService = Services.GetService<IAppShellService>();
-
-            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
+            this.InitializeComponent();
         }
 
-        protected override async void OnLaunched(LaunchActivatedEventArgs args)
+        /// <summary>
+        /// Invoked when the application is launched.
+        /// </summary>
+        /// <param name="args">Details about the launch request and process.</param>
+        protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
         {
-            ConfigureWindow();
-
-            _appShellService.AppWindow = m_Window;
-
-            foreach (var service in initializeServices)
-            {
-                await service.InitializeAsync();
-            }
-
-            m_ShellFrame.Navigate(typeof(AppShell));
-            m_Window.Activate();
+            m_window = new MainWindow();
+            m_window.Activate();
         }
 
-        private void ConfigureWindow()
-        {
-            m_Window = new WindowEx
-            {
-                SystemBackdrop = new MicaBackdrop(),
-                ExtendsContentIntoTitleBar = true,
-                MinWidth = 420
-            };
-
-            m_ShellFrame = new Frame();
-
-            m_Window.Content = m_ShellFrame;
-        }
+        private Window m_window;
     }
 }