I've installed iOS 5, updated Lion to 10.7.2, marked Calendar and Contacts sync in System settings for iCloud on my Mac. However iCal and Address Book sync between iCloud and Mac (MacBook Pro) does not work though there is no problem in syncing between iCloud and iPhone. Whether I create new event or contact, change existing one or delete existing one in iCloud this change is not reflected on my Mac and vise versa. I could not find a solution in this forum.