Updated to Mountain Lion from Snow Leopard last night (via App Store) and when I go to System Preferences I'm missing the iCloud and Mail, Contacts, and Calendars (however, Mission Control and Notifications are present). Any ideas on how to resolve this? BTW, I'm on a mid-2010 Macbook Pro. Update: Issue was resolved after re-installing Mountain Lion by way of the recovery partition. The icons for iCloud and Mail, Contacts, and Calendars have appeared.