Display your calendar in a table view, such as by recurrence, and scroll
through the events until you find the broken one and then delete it.

--
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, Steve Muzig wrote:

| I have a reminder that keeps on opening every time I start Outlook. I
| attempt to dismiss it, but it tells me that it cannot find the
| occurrence and that the reminder can't be deleted. I have tried
| /cleanreminders to no avail.