When attempting to dismiss a reminder Microsoft Outlook errors with the message ‘Cannot turn off the reminder. You may be reminded again. The folder is full’


This occurred after upgrading an Outlook installation from Outlook 2007 to 2010 using an existing Outlook data file.

I resolved this by closing Outlook and launching Outlook.exe from the command line with the “cleanreminders” argument:

C:’Program Files’Microsoft Office’Office14’OUTLOOK.EXE /cleanreminders

Note: Office14 in this case links to Office 2010. The Office iteration is different by version.