Messages may be stuck in the Outbox when you use Windows Mail on a computer that is running Windows Vista

SYMPTOMS

On a computer that is running Windows Vista, some messages may be stuck in the Outbox when you use Windows Mail. You cannot send or delete these messages. Additionally, every time that you close Windows Mail, you are prompted that there are unsent messages in your Outbox.

The complete Knowledge Base article is available at: http://support.microsoft.com/kb/941090/

A utility that can solve this and other problems, programmed by MVP Stephen L. Cochran, is available at: http://www.oehelp.com/WMUtil/