Problem is an understatement. I turned on sync with iCal and two very old events turned on reminders every 15 minutes from 2006 to the year 4500. I calculated that it was adding 87.39 million reminders to the calendar. I finally got them all deleted (three other events also did this) and the next time it sync'd they all reappeared.
I tried to open iCal, but it keeps hanging, requiring a force quit.
There doesn't appear to be a way to correct the iCal calendar. Does Outlook only sync one way? Do I need to trash the iCal calendar? All the other info appears to be in Outlook. I was doing this to sync with Google Calendar.