A few thoughts:
A) You may have a corrupted Outlook folder or file; try one or both of the following:
* Run the Inbox Repair Tool. A short tutorial can be found here:
http://www.emailaddressmanager.com/outlook/repair.html
* Use the MS Office "Detect and Repair" tool: http://support.microsoft.com/?scid=kb;en-us;822238&spid=2522&sid=24
B) Scan for viruses. Before doing so, make sure that your anti-virus program has the absolutely most current updates/virus definition files installed.
C) If your anti-virus program has an email-scanning feature (most do), turn off that feature and see if doing so has any effect on the problem.
DMR
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