Hi,
Check to see if you have any 3rd part add-ins enabled. Sometimes these add-ins will temporarily save the contents of the email which results in a copy being held in the Drafts folder. To easily test this, start Outlook on the command line with the "/safe" switch.
Mike Sperry
http://www.SperrySoftware.com
Find 37 Outlook add-ins that can make a difference!