See http://www.howto-outlook.com/faq/messagestuckinoutbox.htm

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Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more
http://www.msoutlook.info/
Real World Questions, Real World Answers
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> I have a message sitting in my outbox that will not go thru, however, it
> keeps trying and it's not allowing my other e-mail to be sent... help
> I've
> tried to delete it but can't get it to go away...