diff --git a/SharepointToolbox/App.xaml.cs b/SharepointToolbox/App.xaml.cs
index bbaf1c4..2348393 100644
--- a/SharepointToolbox/App.xaml.cs
+++ b/SharepointToolbox/App.xaml.cs
@@ -119,12 +119,38 @@ public partial class App : Application
         services.AddTransient<Func<TenantProfile, SitePickerDialog>>(sp =>
             profile => new SitePickerDialog(sp.GetRequiredService<ISiteListService>(), profile));
 
+        // Phase 4: Bulk Operations Infrastructure
+        var templatesDir = Path.Combine(appData, "templates");
+        services.AddSingleton(_ => new TemplateRepository(templatesDir));
+        services.AddSingleton<GraphClientFactory>();
+        services.AddTransient<ICsvValidationService, CsvValidationService>();
+        services.AddTransient<BulkResultCsvExportService>();
+
         // Phase 4: File Transfer
         services.AddTransient<IFileTransferService, FileTransferService>();
-        services.AddTransient<BulkResultCsvExportService>();
         services.AddTransient<TransferViewModel>();
         services.AddTransient<TransferView>();
 
+        // Phase 4: Bulk Members
+        services.AddTransient<IBulkMemberService, BulkMemberService>();
+        services.AddTransient<BulkMembersViewModel>();
+        services.AddTransient<BulkMembersView>();
+
+        // Phase 4: Bulk Sites
+        services.AddTransient<IBulkSiteService, BulkSiteService>();
+        services.AddTransient<BulkSitesViewModel>();
+        services.AddTransient<BulkSitesView>();
+
+        // Phase 4: Templates
+        services.AddTransient<ITemplateService, TemplateService>();
+        services.AddTransient<TemplatesViewModel>();
+        services.AddTransient<TemplatesView>();
+
+        // Phase 4: Folder Structure
+        services.AddTransient<IFolderStructureService, FolderStructureService>();
+        services.AddTransient<FolderStructureViewModel>();
+        services.AddTransient<FolderStructureView>();
+
         services.AddSingleton<MainWindow>();
     }
 }
diff --git a/SharepointToolbox/MainWindow.xaml b/SharepointToolbox/MainWindow.xaml
index a7fe28c..8598300 100644
--- a/SharepointToolbox/MainWindow.xaml
+++ b/SharepointToolbox/MainWindow.xaml
@@ -53,14 +53,20 @@
       <TabItem x:Name="DuplicatesTabItem"
                Header="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[tab.duplicates]}">
       </TabItem>
-      <TabItem Header="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[tab.templates]}">
-        <controls:FeatureTabBase />
+      <TabItem x:Name="TransferTabItem"
+               Header="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[tab.transfer]}">
       </TabItem>
-      <TabItem Header="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[tab.bulk]}">
-        <controls:FeatureTabBase />
+      <TabItem x:Name="BulkMembersTabItem"
+               Header="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[tab.bulkMembers]}">
       </TabItem>
-      <TabItem Header="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[tab.structure]}">
-        <controls:FeatureTabBase />
+      <TabItem x:Name="BulkSitesTabItem"
+               Header="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[tab.bulkSites]}">
+      </TabItem>
+      <TabItem x:Name="FolderStructureTabItem"
+               Header="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[tab.folderStructure]}">
+      </TabItem>
+      <TabItem x:Name="TemplatesTabItem"
+               Header="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[tab.templates]}">
       </TabItem>
       <!-- Settings tab: content set from code-behind via DI-resolved SettingsView -->
       <TabItem x:Name="SettingsTabItem"
diff --git a/SharepointToolbox/MainWindow.xaml.cs b/SharepointToolbox/MainWindow.xaml.cs
index 630f971..e8fd37e 100644
--- a/SharepointToolbox/MainWindow.xaml.cs
+++ b/SharepointToolbox/MainWindow.xaml.cs
@@ -32,6 +32,13 @@ public partial class MainWindow : Window
         // Replace Duplicates tab placeholder with the DI-resolved DuplicatesView
         DuplicatesTabItem.Content = serviceProvider.GetRequiredService<DuplicatesView>();
 
+        // Phase 4: Replace stub tabs with DI-resolved Views
+        TransferTabItem.Content = serviceProvider.GetRequiredService<TransferView>();
+        BulkMembersTabItem.Content = serviceProvider.GetRequiredService<BulkMembersView>();
+        BulkSitesTabItem.Content = serviceProvider.GetRequiredService<BulkSitesView>();
+        FolderStructureTabItem.Content = serviceProvider.GetRequiredService<FolderStructureView>();
+        TemplatesTabItem.Content = serviceProvider.GetRequiredService<TemplatesView>();
+
         // Replace Settings tab placeholder with the DI-resolved SettingsView
         SettingsTabItem.Content = serviceProvider.GetRequiredService<SettingsView>();