Display the calendar in a table view like Appointments and add the reminder column to the view. Then sort by that column and examine each entry until you find the damaged one. Hightlight it (don't open) and press delete.

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Milly Staples [MVP - Outlook]

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After furious head scratching, RudyCardenas asked:

| One of my clients has a problem with a reminder for which there is no
| longer a corresponding appointment. When he tries to dismiss it
| Outlook generates an error message stating The appointment cannot be
| opened. Recurrence information coould not be found.
|
| I ran Outlook commandline switches cleanreminders and cleanfreebusy
| with negative results.
|
| What, short of wiping the machine clean, can I do to resolve this
| annoyying issue?