Live Meeting Add-in Pack created a meeting automatically.
 

I had a crazy problem with a meeting being created and the e-mail being put
in my deleted items folder upon every login of Outlook. The meeting was
never put in my calendar and didn't have a subject. After quite a bit of
time, and some expert help, I uninstalled the Live Meeting Add-in Pack and
the problem was solved. This is a bug that you need to look into and
resolve. Thanks!

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http://www.microsoft.com/office/comm....calendari ng