Mass duplicate calendars and events

Question

Has anybody, including Apple, figured out how to mass delete multiple duplicate events in iCal and in iPhone's Calendars. .... And, how to avoid these annoying mass duplicates, i.e., without having to reset iPhone and iCal? This seems to be a syncing problem, probably in the resetting section of .Mac preferences, which may be the culprit in creating these mass duplications.

Answer 1

I had an issue with many calendar events being duplicated in Entourage and my iPhone. I'm running OS X 10.4.11, iTunes 7.7.1, Office 2008. This has worked for me (naturally, I take no responsibility for your data. These are the steps I ran through with Apple tech support for my setup and worked for me. I hope it will work for you, too).
Solution from Apple as follows:
1. Sync iPhone (if you have new items to sync with your calendar/contacts).
2. Delete all of your duplicates from the contact list and calendar.
3. Open iSync (under applications)
4. Select Preferences (under iSync)
5. Click on Reset Sync History (bottom of dialog box). Note: if this is greyed out, try connecting your phone to your computer.
6. Open iTunes
7 Select your iPhone in the left side window
8. Select the Info tab across the top of the main window.
9. Scroll down to the Advanced section and check off Contacts and Calendars under Replace information on this iPhone.
10. Click apply
11. Click sync
iSync will now write the contacts and calendar information from your computer to your phone. Once this is done go back to the info tab in iTunes (step 9) and uncheck contacts and calendars in the Advanced section. Click Apply.
I hope this helps (and I hope Apple views this post and gives their blessing).