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As you would expect, it also does good ol' fashioned instant messaging and text messaging -- or "legacy chat" -- as Apple calls it.
There are new Settings in "Mountain Lion", such as Notifications, Spotlight changes, and Dictation & Speech. You will also note that since iCloud's release, there is no longer a MobileMe option.
AirPlay is supported on "Mountain Lion". Those with a next-generation MacBook Pro, the display can be optimised for the new Retina display.