cant shut down outlook

Does anyone know why the following code doesnt shut down outlook. I
have an app that auotmatically starts up outlook, using this code

NmSpace := Outlook.GetNamespace('MAPI');

NmSpace.Logon('', '', False, False);

Folder := NmSpace.GetDefaultFolder(olFolderInBox);

this code is in the destroy event of my main form




after shutting down my app and pressing Ctrl+alt+delete, outlook is
still listed in the task manager.

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