#12 Mirror your screen to your TV or projector:

Inherited from the iOS on the iPad, the OS X Mountain Lion now allows the users to adjust their screens to the pixels of a TV or a projector. Users can adjust their screen performance via Display preference tab and by default your Mac screen will be adjusted to the TV screen. The OS also helps to auto detect any Apple TV’s in the network. And it also has a one-click option to turn mirroring on or off.

#13 Automatic syncing of accounts and mail riles:

Earlier users used to get frustrated on constructing and reconstructing mail rules whenever they had to change their Mac operating systems. But now with OS X Mountain Lion, users can automatically get their mails and settings synchronized across all the Macs using the same iCloud ID. This feature is also soon to be supported in iOS 6.