Short URL: http://slipstick.me/reminder
When reminders just won't dismiss, there are several things you can try to get rid of it:
Use the Cleanreminders switch. This works most of the time.
When cleanreminders doesn't work, look for the appointment the reminder belongs to and delete it.
When you can't find the appointment, you need to use MFCMAPI to browse "inside" the message store and delete the reminders. Outlook will then rebuild the list with just the valid reminders.
The easiest way to try to get rid of corrupt
reminders is by closing Outlook and reopening it
using the /cleanreminders switch. To do this,
press Windows key + R to open the Run dialog.
type
outlook /cleanreminders
in the field and press Ok.
Make sure you have a space between Outlook and the slash. Using 'outlook.exe' is optional - just the program name should work. A (very) few people will need to use the full path to outlook.exe. Click Browse and look under C:\Program Files\Microsoft Office\ (C:\Program Files (x86)\Microsoft Office\ if using 64-bit Windows).
Outlook will rebuild the valid reminders.