it's related to netfolders
http://support.microsoft.com/default.aspx?scid=kb;FR;q266732

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Diane Poremsky [MVP - Outlook]
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> My Outlook keeps shutting down every 2 minutes with a
> message stating: "This program has performed an illegal
[quoted text clipped - 18 lines]
> to no avail. Can someone help. It shuts down regarding
> of whether the program is idle or in use. Thank you.