1. Have you tried to create a new profile via control panel? 2. Have you tried opening outlook in safe mode? (http://www.howto-outlook.com/howto/commandlineswitches.htm) 3. Have you tried to a system restore to the day before it stopped working? 4. One article suggest that you will need to install the Windows Search 4.0 service, and then restart Outlook
Let me know how you get on.
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