IPhone 4 calendar entries get duplicated for all day events

Hi all,
A new one, I have an iPhone 4 which is duplicating all day events for no reason. You can delete one of the events and then it promptly shows up again. The other two all day events for the same item can not be edited or deleted. They originally where doing the same thing on the Mac but I resolved that by following Apple's support info on deleting the cache and resetting sync history. The Mac shows the correct calendar info just the iPhone is doing the duplicates. I've removed the iPhone calendar and then added it back to the iPhone to have the same thing happen. I've also copied all calendar info to a new calendar, removed the old one from iCal and the phone and synced the new one to have the same thing happen again. I am not using Mobile Me, never have and don't have an account so it's not that.

Angus,
I've found a solution that worked for me. I hope it works for you too:
1. Make a backup of your Mac iCal. (It's not a step to recover the data in case something go wrong, we'll need the backup file for sure)
2. Download iCal Dupe Deleter from http://www.nhoj.co.uk/icaldupedeleter/
3. Run iCal Dupe Deleter and select the calendar in wich you have the duplicated events. Then press the "Test selected calendar" button.
4. If the app finds any duplicates, another button will appear. Press it and follow the steps.
5. Once iCal Dupe Deleter has opened iCal and restored the data with the new one, load the backup file that you saved on step 1 and restore.
6. Sync your iPhone with iTunes as you usually do and your iPhone calendar will be perfect again.
Please, let me know if it works for you.

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