I'm trying to reset iCal by removing all my existing data, but removing my old calendars etc. seems for some reason impossible. No matter what I remove they still reappear! Having read other posts I've now tried trashing the following folders: USERNAME/Library/Application Support/iCal/ and USERNAME/Library/Caches/Metadata/iCal/ and USERNAME/Library/Caches/Metadata/com.apple.iCal/ I'm using MacOS 10.4.11 After deleting the above folders and reopening iCal I'm presented with just two calendars ("Home" and "Work") but after around 10 seconds all my old calendars pop up again! Which files/folders have I missed?