Problem: Error 6003 for .mac

Get error code from dotmacsync.log (found in Spotlight). Google: .mac sync error 6003 From Apple's boards re: 6003, some Terminal mojo, that didn't work; neither did resetting the sync history.

Here's how to do it manually, by deleting the history file:

• If you haven't done so lately, make a backup of your iCal calendars (iCal File menu > Back up iCal)
• Quit out of all open programs
• Make sure that nothing is syncing (Spanning Sync, .Mac, iSync)
• Move this folder to the trash: ~/Library/Application Support/ SyncServices
• Restart
• Open iCal and give it a few minutes to write out the new database ...

This worked! No errors. Now, to iCal...

"Your calendar information is being reset..."

And it works! Sweet!