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Message: [QUOTE="Ken Slovak - [MVP - Outlook], post: 4815438"] A VSTO addin or a shared addin? If VSTO, are you setting the trust on the assemblies to full trust? Are you strong naming your addin assemblies? Take a look at the information about debugging managed code addins at [URL]http://blogs.msdn.com/vsod/archive/2008/04/22/Troubleshooting-com-add-in-load-failures.aspx[/URL]. You most likely will have to review the Fusion logs to see where and why the addin is failing to load (Fusion is the managed code loader). [/QUOTE]