Start->Run->Outlook.exe /cleanreminders.

Signature
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Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. Due to
the (insert latest virus name here) virus, all mail sent to my personal
account will be deleted without reading.
After furious head scratching, Taedo1 asked:
| I keep getting a reminder every morning for a recurring appointment
| that has been deleted. When I click on the "Open Item" button when
| the reminder comes up it says " Cannot open the item for this
| reminder. You changed one of the recurrences of this item, and this
| instance no longer exists. Close any open items and try again.