VSTO for Outlook and setup project
When you create a new Outlook addin with VSTO support, you will get 2 project - the addin and installer.
I was having problems with an installer (some dependencies could not be determined) so I removed the setup project from solution and when I was finished I add a new setup project. Of course I didn't work because when the Outlook Addin project is created the setup project contains neccessary registry entries.
So, if you remove the original setup project don't forget to add registry entries and set the policy correctly (see my previous post).