For a client I was syncing using entourage 2008 new ical syncing feature, and when it imported all the clients calendars labels into a single group in ical, i decided to delete that group in ical as this wasnt a sufficient result for me, as i wanted seperate groups for each label type used in the entourage calendar, it immediateley started syncing back to entourage the deletion from ical, back in the opposite direction and boom it deleted all the calendars from the clients entourage so be carefull when using entourage 2008’s built in sync services this is a warning, luckily i had an older version to revert to, but thats a serious issue. I even set it to so that entourage should write over ical but it synced the deletion back to entourage, quiting entourage while it did deleted, did not save any calendar information either as it was a true background process.