After checking the issue, it seems this is a general Outlook 2007 related issue. As this forum focuses on Windows 7 specific issues, this inquiry would best be posted to Outlook forum:
http://social.technet.microsoft.com/Forums/en/outlook/threads
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
Also, for your information, I'd like to include the following articles regarding the issue:
How to find and run the Inbox Repair tool in Outlook
http://support.microsoft.com/kb/272227/en-us
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