Have you tried opening Outlook with the cleanreminders switch?
http://www.outlook-tips.net/beginner/switches.htm

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Diane Poremsky [MVP - Outlook]
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> I have recently upgraded Office 2003 Sp2, to Sp3 and other downloadable
> patches after running microsoft update process.
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>
> Any help would be much appreciated.
Amit - 26 Mar 2008 07:31 GMT
Yes, I tried cleanreminders switch also multiple times. Still the same problem.

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Amit
> Have you tried opening Outlook with the cleanreminders switch?
> http://www.outlook-tips.net/beginner/switches.htm
[quoted text clipped - 12 lines]
> >
> > Any help would be much appreciated.