[slodave]

Try this:

http://thetechieguy.wordpress.com/2008/05/13/email-is-stuck-outlook-2007-fix/

1.Firstly, Open Outlook 2007, Click on File menu and Select Work Offline. This stops outlook from trying to send anything.

2. Open the Outbox folder and now you can either simply Delete the message or you can drag the message out of the Outbox and drop it into your Drafts Folder (or any other folder).

3. Click on File and deselect Work Offline (this will now put Outlook into Online mode again to receive and send messages again)

4. If you moved your email to the Drafts folder, you will then need to go to that folder, open that email, and then press the Send button again.