Article ID: 950774 - View products that this article applies to.
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When you use Group Policy to add multiple versions of an add-in as Office Outlook 2007 trusted add-ins, you may receive the following error message:
The name you entered has already been used. You need to enter a unique name.
To resolve this problem, apply the hotfix that is described in Microsoft Knowledge Base article 950282. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/950282/ )Description of the Office Outlook 2007 hotfix package: March 20, 2008
The inability to add two add-ins that have the same name for the GPO entry is a limitation of the Windows registry. This is because each .dll file name is stored as a registry key, and Windows does not let two registry keys have the same name. Therefore, you cannot use the same name for two add-ins.
The hotfix that is described in the "Resolution" section provides a solution to this problem by using the question mark character (?) as a delimiter. In Outlook 2007, any characters after the question mark are ignored and are not used in the add-in name. This behavior lets you use the characters after the question mark as a comment to help document the add-in. For example, consider the following scenario: