How to troubleshoot a VSTO addin that does not load?

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Here’s a bit more detail on RobertG5’s solution (too long for a comment):

The problem was that the add-in had been hard disabled by Outlook. As I’ve learned, that’s something different than the “usual” not-loading scenario. The key to realizing this was to notice that the add-in did not show up under Inactive Application Add-Ins, but rather under Disabled Application Add-Ins. That makes a difference: In the latter case, just going to the COM-AddIn screen and ticking the check box just does nothing. (I guess a nice message box “You cannot load this add-in because it has been hard-disabled” would be too much to ask… sigh.)

So, how do I re-enable a hard disabled add-in?

  1. In the Manage box, change COM Add-ins to Disabled Add-ins, and then click Go.
  2. Select the add-in and click Enable. Click Close.

OK, now the add-in can be loaded again:

  1. In the Manage box, change Disabled Add-ins to COM Add-ins, and then click Go.
  2. select the check box next to the disabled add-in. Click OK.

Reference: http://msdn.microsoft.com/en-us/library/ms268871.aspx

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