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A 2007 Office system application does not load an add-in that is developed by using VSTO
Article ID: 976811 - View products that this article applies to.
A 2007 Office system application does not load an add-in that is developed by using Visual Studio Tools for Office (VSTO).
Note VSTO add-ins are registered under the HKEY_LOCAL_MACHINE key.
To resolve this issue, apply hotfix package 976477, and then enable the hotfix package. To do this, follow these steps:
For more information about the DontDisplayHKLMAddins registry entry, click the following article number to view the article in the Microsoft Knowledge Base:
929590When you deploy both the EnableLocalMachineVSTO and DontDisplayHKLMAddins registry entries, the add-ins are listed in the Trust Center of a 2007 Office system. Additionally, you cannot remove the add-ins because they do not appear in the COM Add-ins window.
(http://support.microsoft.com/kb/929590/ )Known issues when you develop custom solutions for Office Outlook 2007
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 976811 - Last Review: November 24, 2009 - Revision: 1.0