There are some limitations when you using Outlook 2007 in a Citrix or Microsoft Terminal Services environment.
Microsoft Outlook 2007 has features that are disabled went installed on a Citrix or on Terminal Services environment, these are as follows.
Offline store (OST) files.
Features that rely on the OST (for example, Cached Exchange Mode and Offline mode) are not supported with Terminal Services.
Forms Designer and the Microsoft Visual Basic Scripting Edition (VBScript) editor.
You can view a custom form, but you cannot design a new form or revise an existing form.
Changing the Time Zone from within Outlook.
Changing this setting in Outlook updates a system setting.
Changing Zone security settings from within Outlook.
Changing this setting in Outlook updates a system setting.
Changing the status of a Microsoft Exchange Client Extension.
You cannot change the status; however, if the Exchange Client Extension is already on, the extension should work correctly.
Adding stationery that was not included with Outlook as part of the Terminal Services installation.
Outlook animations are disabled.
Examples of Outlook animations include Send/Receive animation and the Search Folder creation icon.
Unlocking registry settings
By default, Windows Terminal Services clients do not have write access to the registry on the Windows Terminal Services computer, except to the registry hive under HKEY_CURRENT_USER.
To run some Outlook features, you might want to give users write access to some keys and subkeys.
For example, unlock the subkey HKEY_CLASSES_ROOT\CLSID to allow users to use the custom MAPI forms for Office Outlook 2007.