From time to time I run into issues of removing reminders from my Outlook because I would remove it via my handheld device. When this happens its a bit annoying because it becomes a challenge to remove it. A little Google-ing finally came up with a solid answer.
Issue:
Past Reminders keep firing with below errors every time Outlook is opened.
while dismiss them- "Cannot turn off the reminder. You may be reminded again. the end date you entered occurs before the start date"
Here is the solution for future reference:
Download MFCMAPI tool from http://support.microsoft.com/?ID=291794
1. Run MFCMAPI on the desktop
2. Go to Session->Logon and Display Store Table
3. Select your profile
4. Select Mailbox
5. Expand "Root Container"
6. Right click “Reminders" and select "Open Contents Table"
7. New Window Launches with Title Reminders
8. Select all the reminder items listed there, Right click and select "Delete Message"
9. Close MFCMAPI
Ø Reopened Outlook and don't find the past Reminders firing again. The issue got resolved.