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Click the Settings charm to access the Permissions box for any Metro style app. The Calendar app has explicit permission to run in the background so it can display detailed notifications of upcoming appointments on the lock screen.
The unified messaging app replaces Windows Live Messenger and allows direct connections to Facebook friends and Yahoo Messenger contacts.
If you've linked social networks to your Windows Live account, status messages show up here. The People app is notably missing a snapped view ("coming soon," it says).