August 1st, 2012
Mountain Lion introduces more than 200 innovative features including the all-new Messages app, Notification Center, system-wide Sharing, Facebook integration (will come later), Dictation, Power Nap, AirPlay Mirroring, Game Center, and the enhanced security of Gatekeeper. iCloud is also built in to the foundation of OS X.
Just click the image to the left to access the Mac App Store. Oh yeah, Mountain Lion is also available as an upgrade from Lion and Snow Leopard for $19.99.
