Either start Outlook one time with the /cleanreminders option (posted here
hundreds if not thousands of times) or use a table view of your calendar and
delete the obvious.

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Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.
After furious head scratching, Gordon asked:
| When one opens the Outlook Calenda an vague message appears that
| tells us that there is a problem with one of our reminders and that
[quoted text clipped - 13 lines]
| button, follow this link to open the suggestion in the Microsoft
| Web-based Newsreader and then click "I Agree" in the message pane.
http://www.microsoft.com/office/community/en-us/default.mspx?mid=e265dd25-4ae7-4
c0a-8cbf-ec35c6b3d36e&dg=microsoft.public.outlook.calendaring