I thought that I should flag for the new diagnostic tool, AddInSpy, from MSFT. I have only started out to test it but I already like what I see. It can be a valuable source to detect present status for individual COM add-ins of all kind, i.e. managed, VSTO and unmanaged and provide a great number of values.
The below screen shot shows a report that gives a detailed overview (it’s rather wide):
For more information please see: