Whenever I open Outlook 2007 SP2, I'll get a username/password prompt that has our Sharepoint server's address. No matter which known-valid set of credentials I enter, it doesn't seem to accept them. I've tried including the domain in my username and omitting it, and going through past passwords just to be sure.
If I hit ESC or just close the prompt, it will go away for awhile. However, it still re-appears from time to time.
The one thing I can think of that may be causing this, would be some sort of link to some Sharepoint content that has been removed from Sharepoint. But, I can't think of when or where this link would have been made or what to.
How can I easily troubleshoot and resolve this as an end-user?