HT4132: How to identify MacBook Pro modelsLearn about How to identify MacBook Pro models
Currently Being ModeratedFeb 27, 2013 2:02 PM (in response to tkaszuba)
Welcome to the Apple Support Communities
See > http://support.apple.com/kb/HT5404 AirPlay Mirroring is only compatible with Early 2011 and newer MacBooks Pro, so if you upgrade to OS X Mountain Lion, you won't get it.
However, although your MacBook isn't compatible with AirPlay Mirroring, you can still use a third-party app to mirror the computer onto your Apple TV. To do it, you can use AirParrot > http://www.airparrot.com