MobileMe synchronisation problems

Whilst MobileMe is a great way of keeping your Address Book and iCal data synced between multiple Macs, it’s known to have quite a few quirks. You can particularly have issues after migrating data to a new machine that uses the same computer name and account name, as MobileMe gets confused which machine it should sync with. Try stopping synchronisation on both machines, changing the computer name to something distinct and then performing a resync.