I have an HTC Desire phone which is great apart from the incessant recurring meeting calendar reminders from my former company. I have deleted the Exchange account and these recurring meetings no longer show up in my regular calendar, but the reminders keep coming!
How do I clear out these reminders?
Try clearing your calendar data (Settings -> Applications -> Calendar -> Clear Data).
If that doesn't work then you might have to resort to a factory reset.
(If you have to go this route then there are lots of options for backing up your data before hand to minimize the pain)