I have had my iPad 2 since December last year, and although I have it set up to sync via wifi with my iMac, not all events in the calendar will sync. Even when I am connected via USB, these items will not sync. My wife has an IPhone 3GS which she also syncs through the same computer. She has the items on her iPhone calendar that I can't get on mine. I'm not sure if these items were originally entered on her iPhone or on my iMac. Would it make a difference?