Control Panel->Mail Icon->Accounts->View or Change. Delete the Exchange account.
This presumes you are using Outlook 2003/2007, which you decided was not important to include in your post. YMMV.
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Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact.
How to ask a question
http://support.microsoft.com/KB/555375
After furious head scratching, jillykins20 asked:
| Hi. I'm trying to remove a microsoft exchange account and leave
| myself with normal email accounts. However, despite creating a new
| location for the emails, any I create remain in the old location's
| outbox and don't get sent. Any ideas would be much appreciated.