ICal suddenly has 100 calendars, all the same

Is there a way to simply remove all the calendars I have in iCal? MobileMe seems to have gone berserk and duplicated all my calendars about a hundred times. As there is no multi-select or hot-key combo, it would take a long long time to remove all of them.

Greetings,
Try the basics first:
Remove the following to the trash and restart your computer:
Home > Library > Caches
Home > Library > Calendars > Calendar Cache, Cache, Cache 1, 2, 3, etc. (Do not remove Sync Cache or Theme Cache)
Home > Library > Preferences > com.apple.ical (There may be more than one of these. Remove them all.)
__NOTE: Removing these files will remove any shared (CalDAV) calendars you may have access to. You will have to re-add those calendars to iCal > Preferences > Accounts.
Once the computer is back up and running open iCal and test.
If the duplicates are still there, reset your sync services: http://support.apple.com/kb/TS1627
If the duplicates are still there:
1. Turn off syncing with MobileMe by going to Apple Menu > System Preferences > MobileMe > Sync and removing the check mark for Synchronize with MobileMe.
2. Safe Boot your computer: http://support.apple.com/kb/HT1564
3. Once in Safe Boot remove the following to the trash and then restart the computer:
Macintosh HD > Library > Caches -- Remove all items in the Caches folder to the trash
Your User > Library > Calendars -- Remove all items within the Calendars folder to the trash
4. Test iCal
5. Assuming iCal looks fine at this point you can go back to MM Prefs and turn syncing back on and test again.
Hope that helps.

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