diff --git a/LiamWorkflowDiagnostics/MainWindow.xaml b/LiamWorkflowDiagnostics/MainWindow.xaml
index de63eda..afeebef 100644
--- a/LiamWorkflowDiagnostics/MainWindow.xaml
+++ b/LiamWorkflowDiagnostics/MainWindow.xaml
@@ -455,6 +455,12 @@
         </GroupBox>
 
         <StackPanel Grid.Row="5" Orientation="Horizontal" HorizontalAlignment="Right" Margin="0,0,0,8">
+            <CheckBox x:Name="WhatIfCheckBox"
+                      Content="WhatIf aktiv (Schreibaktionen nur simulieren)"
+                      Margin="0,0,16,0"
+                      VerticalAlignment="Center"
+                      IsChecked="True"
+                      Click="WhatIfCheckBox_Click"/>
             <Button x:Name="LoadJsonButton" Content="Load JSON" Width="110" Margin="0,0,8,0" Click="LoadJsonButton_Click"/>
             <Button x:Name="ExportJsonButton" Content="Export Sanitized JSON" Width="170" Margin="0,0,8,0" Click="ExportJsonButton_Click"/>
             <Button x:Name="InitializeButton" Content="Initialize Provider" Width="160" Margin="0,0,8,0" Click="InitializeButton_Click"/>
diff --git a/LiamWorkflowDiagnostics/MainWindow.xaml.cs b/LiamWorkflowDiagnostics/MainWindow.xaml.cs
index 83329df..016673a 100644
--- a/LiamWorkflowDiagnostics/MainWindow.xaml.cs
+++ b/LiamWorkflowDiagnostics/MainWindow.xaml.cs
@@ -113,6 +113,7 @@ namespace LiamWorkflowDiagnostics
             MsTeamsVisibilityComboBox.SelectedValue = MsTeamsVisibilityPrivate;
             MsTeamsCloneSettingsCheckBox.IsChecked = true;
             MsTeamsCloneChannelsCheckBox.IsChecked = true;
+            WhatIfCheckBox.IsChecked = true;
 
             FetchDataAreasButton.IsEnabled = false;
             FetchSecurityGroupsButton.IsEnabled = false;
@@ -240,6 +241,18 @@ namespace LiamWorkflowDiagnostics
             AppendLog("Log gelöscht.", LogLevels.Debug);
         }
 
+        private void WhatIfCheckBox_Click(object sender, RoutedEventArgs e)
+        {
+            if (_isInitializingUi)
+                return;
+
+            UpdateActionHint();
+            SaveSettings();
+            AppendLog(IsWhatIfEnabled
+                ? "WhatIf aktiviert. Schreibende Aktionen im Diagnostics Tool werden nur simuliert."
+                : "WhatIf deaktiviert. Schreibende Aktionen im Diagnostics Tool werden real ausgeführt.", LogLevels.Warning);
+        }
+
         private void LogListBox_KeyDown(object sender, KeyEventArgs e)
         {
             if ((Keyboard.Modifiers & ModifierKeys.Control) != ModifierKeys.Control)
@@ -327,6 +340,7 @@ namespace LiamWorkflowDiagnostics
             ServerNameTextBox.Text = settings.ServerName ?? string.Empty;
             UseHttpsCheckBox.IsChecked = settings.UseHttps;
             LicenseTextBox.Text = settings.License ?? string.Empty;
+            WhatIfCheckBox.IsChecked = settings.EnableWhatIf;
             NtfsCreateFolderPathTextBox.Text = settings.NtfsCreateFolderPath ?? string.Empty;
             NtfsCreateParentPathTextBox.Text = settings.NtfsCreateParentPath ?? string.Empty;
             NtfsCreateOwnerSidsTextBox.Text = settings.NtfsCreateOwnerSids ?? string.Empty;
@@ -405,6 +419,7 @@ namespace LiamWorkflowDiagnostics
                     ServerName = ServerNameTextBox.Text ?? string.Empty,
                     UseHttps = UseHttpsCheckBox.IsChecked ?? false,
                     License = LicenseTextBox.Text ?? string.Empty,
+                    EnableWhatIf = WhatIfCheckBox.IsChecked ?? true,
                     GroupStrategy = GroupStrategyCombo.SelectedItem is eLiamGroupStrategies gs ? (int)gs : (int)eLiamGroupStrategies.Ntfs_AGDLP,
                     NtfsCreateFolderPath = NtfsCreateFolderPathTextBox.Text ?? string.Empty,
                     NtfsCreateParentPath = NtfsCreateParentPathTextBox.Text ?? string.Empty,
@@ -522,9 +537,13 @@ namespace LiamWorkflowDiagnostics
                     break;
             }
 
+            var modeHint = IsWhatIfEnabled
+                ? " WhatIf ist aktiv: Schreibende Diagnostics-Aktionen werden nur simuliert."
+                : " WhatIf ist deaktiviert: Schreibende Diagnostics-Aktionen werden real ausgeführt.";
+
             ActionHintTextBlock.Text = providerReady
-                ? providerHint
-                : $"Initialisiere zuerst einen Provider. {providerHint}";
+                ? providerHint + modeHint
+                : $"Initialisiere zuerst einen Provider. {providerHint}{modeHint}";
         }
 
         private async void FetchDataAreasButton_Click(object sender, RoutedEventArgs e)
@@ -583,6 +602,8 @@ namespace LiamWorkflowDiagnostics
                 var ownerSids = ParseIdentifierList(NtfsCreateOwnerSidsTextBox.Text, "Owner SIDs");
                 if (ownerSids.Count == 0)
                     throw new InvalidOperationException("Owner SIDs: mindestens ein Eintrag ist fuer die Ordneranlage erforderlich.");
+                var readerSids = ParseIdentifierList(NtfsCreateReaderSidsTextBox.Text, "Reader SIDs");
+                var writerSids = ParseIdentifierList(NtfsCreateWriterSidsTextBox.Text, "Writer SIDs");
 
                 var result = await LiamWorkflowRuntime.CreateDataAreaAsync(
                     provider,
@@ -590,14 +611,41 @@ namespace LiamWorkflowDiagnostics
                     parentPath,
                     null,
                     ownerSids,
-                    ParseIdentifierList(NtfsCreateReaderSidsTextBox.Text, "Reader SIDs"),
-                    ParseIdentifierList(NtfsCreateWriterSidsTextBox.Text, "Writer SIDs"));
+                    readerSids,
+                    writerSids);
 
                 return new
                 {
                     result.Success,
                     ResultToken = MapResultToken(result.ResultToken)
                 };
+            }, () =>
+            {
+                var provider = EnsureInitializedProvider<cLiamProviderNtfs>("NTFS");
+                var folderPath = GetRequiredText(NtfsCreateFolderPathTextBox.Text, "New Folder Path");
+                var parentPath = NormalizeOptionalText(NtfsCreateParentPathTextBox.Text);
+                if (string.IsNullOrWhiteSpace(parentPath))
+                {
+                    parentPath = Directory.GetParent(folderPath)?.FullName;
+                }
+                if (string.IsNullOrWhiteSpace(parentPath))
+                    throw new InvalidOperationException("Parent Folder Path konnte nicht ermittelt werden.");
+                var ownerSids = ParseIdentifierList(NtfsCreateOwnerSidsTextBox.Text, "Owner SIDs");
+                if (ownerSids.Count == 0)
+                    throw new InvalidOperationException("Owner SIDs: mindestens ein Eintrag ist fuer die Ordneranlage erforderlich.");
+
+                return CreateWhatIfResult(
+                    "NTFS Folder Create",
+                    "Wuerde einen Ordner anlegen und fehlende Gruppen sowie ACLs sicherstellen. Es wurden keine Aenderungen ausgefuehrt.",
+                    new
+                    {
+                        ProviderRootPath = provider.RootPath,
+                        NewFolderPath = folderPath,
+                        ParentFolderPath = parentPath,
+                        OwnerSids = ownerSids,
+                        ReaderSids = ParseIdentifierList(NtfsCreateReaderSidsTextBox.Text, "Reader SIDs"),
+                        WriterSids = ParseIdentifierList(NtfsCreateWriterSidsTextBox.Text, "Writer SIDs")
+                    });
             });
         }
 
@@ -607,20 +655,40 @@ namespace LiamWorkflowDiagnostics
             {
                 var provider = EnsureInitializedProvider<cLiamProviderNtfs>("NTFS");
                 var folderPath = GetRequiredText(NtfsEnsureFolderPathTextBox.Text, "Folder Path");
+                var ownerSids = ParseIdentifierList(NtfsEnsureOwnerSidsTextBox.Text, "Owner SIDs");
+                var readerSids = ParseIdentifierList(NtfsEnsureReaderSidsTextBox.Text, "Reader SIDs");
+                var writerSids = ParseIdentifierList(NtfsEnsureWriterSidsTextBox.Text, "Writer SIDs");
+                var ensureTraverse = NtfsEnsureTraverseCheckBox.IsChecked ?? false;
                 var result = await LiamWorkflowRuntime.EnsureNtfsPermissionGroupsAsync(
                     provider,
                     folderPath,
                     null,
-                    ParseIdentifierList(NtfsEnsureOwnerSidsTextBox.Text, "Owner SIDs"),
-                    ParseIdentifierList(NtfsEnsureReaderSidsTextBox.Text, "Reader SIDs"),
-                    ParseIdentifierList(NtfsEnsureWriterSidsTextBox.Text, "Writer SIDs"),
-                    NtfsEnsureTraverseCheckBox.IsChecked ?? false);
+                    ownerSids,
+                    readerSids,
+                    writerSids,
+                    ensureTraverse);
 
                 return new
                 {
                     result.Success,
                     ResultToken = MapResultToken(result.ResultToken)
                 };
+            }, () =>
+            {
+                var provider = EnsureInitializedProvider<cLiamProviderNtfs>("NTFS");
+                var folderPath = GetRequiredText(NtfsEnsureFolderPathTextBox.Text, "Folder Path");
+                return CreateWhatIfResult(
+                    "NTFS Ensure Groups / ACLs",
+                    "Wuerde fehlende NTFS-Berechtigungsgruppen und ACLs additiv sicherstellen. Es wurden keine Aenderungen ausgefuehrt.",
+                    new
+                    {
+                        ProviderRootPath = provider.RootPath,
+                        FolderPath = folderPath,
+                        OwnerSids = ParseIdentifierList(NtfsEnsureOwnerSidsTextBox.Text, "Owner SIDs"),
+                        ReaderSids = ParseIdentifierList(NtfsEnsureReaderSidsTextBox.Text, "Reader SIDs"),
+                        WriterSids = ParseIdentifierList(NtfsEnsureWriterSidsTextBox.Text, "Writer SIDs"),
+                        EnsureTraverseGroups = NtfsEnsureTraverseCheckBox.IsChecked ?? false
+                    });
             });
         }
 
@@ -650,6 +718,30 @@ namespace LiamWorkflowDiagnostics
                     memberSids));
 
                 return result;
+            }, () =>
+            {
+                _ = EnsureInitializedProvider<cLiamProviderAD>("Active Directory");
+                var serviceName = GetRequiredText(AdServiceNameTextBox.Text, "Service Name");
+                var description = NormalizeOptionalText(AdDescriptionTextBox.Text);
+                var scope = AdScopeComboBox.SelectedItem is eLiamAccessRoleScopes selectedScope
+                    ? selectedScope
+                    : eLiamAccessRoleScopes.Universal;
+                var groupType = AdGroupTypeComboBox.SelectedItem is ADServiceGroupCreator.ADGroupType selectedType
+                    ? selectedType
+                    : ADServiceGroupCreator.ADGroupType.Distribution;
+
+                return CreateWhatIfResult(
+                    "AD Ensure Service Groups",
+                    "Wuerde Service-Gruppen im Active Directory anhand der Namenskonvention sicherstellen. Es wurden keine Aenderungen ausgefuehrt.",
+                    new
+                    {
+                        ServiceName = serviceName,
+                        Description = description,
+                        Scope = scope.ToString(),
+                        GroupType = groupType.ToString(),
+                        OwnerSids = ParseIdentifierList(AdOwnerSidsTextBox.Text, "Owner SIDs"),
+                        MemberSids = ParseIdentifierList(AdMemberSidsTextBox.Text, "Member SIDs")
+                    });
             });
         }
 
@@ -661,6 +753,8 @@ namespace LiamWorkflowDiagnostics
                 var sourceTeamId = GetRequiredText(MsTeamsSourceTeamIdTextBox.Text, "Source Team ID");
                 var newTeamName = GetRequiredText(MsTeamsNewNameTextBox.Text, "New Team Name");
                 var visibility = GetSelectedMsTeamsVisibility();
+                var additionalMembers = ParseIdentifierList(MsTeamsAdditionalMembersTextBox.Text, "Additional Members");
+                var additionalOwners = ParseIdentifierList(MsTeamsAdditionalOwnersTextBox.Text, "Additional Owners");
 
                 var result = await LiamWorkflowRuntime.CloneTeamAsync(
                     provider,
@@ -669,10 +763,29 @@ namespace LiamWorkflowDiagnostics
                     NormalizeOptionalText(MsTeamsDescriptionTextBox.Text),
                     visibility,
                     GetSelectedCloneParts(),
-                    string.Join(";", ParseIdentifierList(MsTeamsAdditionalMembersTextBox.Text, "Additional Members")),
-                    string.Join(";", ParseIdentifierList(MsTeamsAdditionalOwnersTextBox.Text, "Additional Owners")));
+                    string.Join(";", additionalMembers),
+                    string.Join(";", additionalOwners));
 
                 return result;
+            }, () =>
+            {
+                _ = EnsureInitializedProvider<cLiamProviderMsTeams>("MsTeams");
+                var sourceTeamId = GetRequiredText(MsTeamsSourceTeamIdTextBox.Text, "Source Team ID");
+                var newTeamName = GetRequiredText(MsTeamsNewNameTextBox.Text, "New Team Name");
+
+                return CreateWhatIfResult(
+                    "MsTeams Clone Team",
+                    "Wuerde ein Team anhand der gewaehlten Clone-Bestandteile klonen. Es wurden keine Aenderungen ausgefuehrt.",
+                    new
+                    {
+                        SourceTeamId = sourceTeamId,
+                        NewTeamName = newTeamName,
+                        Description = NormalizeOptionalText(MsTeamsDescriptionTextBox.Text),
+                        Visibility = GetSelectedMsTeamsVisibility(),
+                        PartsToClone = GetSelectedCloneParts(),
+                        AdditionalMembers = ParseIdentifierList(MsTeamsAdditionalMembersTextBox.Text, "Additional Members"),
+                        AdditionalOwners = ParseIdentifierList(MsTeamsAdditionalOwnersTextBox.Text, "Additional Owners")
+                    });
             });
         }
 
@@ -693,6 +806,19 @@ namespace LiamWorkflowDiagnostics
                     primarySmtp));
 
                 return result;
+            }, () =>
+            {
+                _ = EnsureInitializedProvider<cLiamProviderExchange>("Exchange");
+                return CreateWhatIfResult(
+                    "Exchange Create Shared Mailbox",
+                    "Wuerde eine Shared Mailbox inklusive Ownership-Gruppen erzeugen. Es wurden keine Aenderungen ausgefuehrt.",
+                    new
+                    {
+                        Name = GetRequiredText(ExchangeMailboxNameTextBox.Text, "Name"),
+                        Alias = GetRequiredText(ExchangeMailboxAliasTextBox.Text, "Alias"),
+                        DisplayName = NormalizeOptionalText(ExchangeMailboxDisplayNameTextBox.Text),
+                        PrimarySmtpAddress = NormalizeOptionalText(ExchangeMailboxPrimarySmtpTextBox.Text)
+                    });
             });
         }
 
@@ -713,6 +839,19 @@ namespace LiamWorkflowDiagnostics
                     primarySmtp));
 
                 return result;
+            }, () =>
+            {
+                _ = EnsureInitializedProvider<cLiamProviderExchange>("Exchange");
+                return CreateWhatIfResult(
+                    "Exchange Create Distribution Group",
+                    "Wuerde eine Distribution Group inklusive Ownership-Gruppen erzeugen. Es wurden keine Aenderungen ausgefuehrt.",
+                    new
+                    {
+                        Name = GetRequiredText(ExchangeDistributionNameTextBox.Text, "Name"),
+                        Alias = GetRequiredText(ExchangeDistributionAliasTextBox.Text, "Alias"),
+                        DisplayName = NormalizeOptionalText(ExchangeDistributionDisplayNameTextBox.Text),
+                        PrimarySmtpAddress = NormalizeOptionalText(ExchangeDistributionPrimarySmtpTextBox.Text)
+                    });
             });
         }
 
@@ -777,7 +916,7 @@ namespace LiamWorkflowDiagnostics
             }
         }
 
-        private async Task ExecuteProviderActionAsync(string actionName, Func<Task<object>> action)
+        private async Task ExecuteProviderActionAsync(string actionName, Func<Task<object>> action, Func<object> whatIfAction = null)
         {
             if (action == null)
                 throw new ArgumentNullException(nameof(action));
@@ -786,11 +925,18 @@ namespace LiamWorkflowDiagnostics
             try
             {
                 SaveSettings();
-                AppendLog($"{actionName} gestartet.");
-                var result = await action();
+                var runInWhatIfMode = IsWhatIfEnabled && whatIfAction != null;
+                AppendLog(runInWhatIfMode
+                    ? $"{actionName} im WhatIf-Modus gestartet. Schreibende Aenderungen werden nur simuliert."
+                    : $"{actionName} gestartet.");
+                var result = runInWhatIfMode
+                    ? whatIfAction()
+                    : await action();
                 ResultTextBox.Text = JsonConvert.SerializeObject(result, Formatting.Indented);
                 if (TryGetSuccessFlag(result, out var success) && !success)
                     AppendLog($"{actionName} mit Fehlerstatus abgeschlossen.", LogLevels.Warning);
+                else if (runInWhatIfMode)
+                    AppendLog($"{actionName} im WhatIf-Modus simuliert abgeschlossen.", LogLevels.Warning);
                 else
                     AppendLog($"{actionName} erfolgreich abgeschlossen.");
             }
@@ -823,6 +969,21 @@ namespace LiamWorkflowDiagnostics
             return true;
         }
 
+        private bool IsWhatIfEnabled => WhatIfCheckBox.IsChecked ?? true;
+
+        private object CreateWhatIfResult(string actionName, string message, object input)
+        {
+            return new
+            {
+                Success = true,
+                WhatIf = true,
+                Operation = actionName,
+                Message = message ?? string.Empty,
+                TimestampUtc = DateTime.UtcNow.ToString("s") + "Z",
+                Input = input
+            };
+        }
+
         private TProvider EnsureInitializedProvider<TProvider>(string providerName) where TProvider : cLiamProviderBase
         {
             if (_session?.Provider == null)
@@ -1334,6 +1495,7 @@ namespace LiamWorkflowDiagnostics
             public string ServerName { get; set; } = string.Empty;
             public bool UseHttps { get; set; } = false;
             public string License { get; set; } = string.Empty;
+            public bool EnableWhatIf { get; set; } = true;
             public string NtfsCreateFolderPath { get; set; } = string.Empty;
             public string NtfsCreateParentPath { get; set; } = string.Empty;
             public string NtfsCreateOwnerSids { get; set; } = string.Empty;