Everyone please be aware that if you are planning on purchasing ML (Mountain Lion) for the Airplay feature like I did make sure your Mac supports it. To my amazement after purchasing the upgrade to ML today, the AirPlay feature I was looking forward to more than any other was unavailable. Apparently Apple is trying the same trick they did with mobile devices. AirPlay is unavailable for an Macbook purchased before 2011. What a joke!!!! Maybe Apple should lower the price for those of us with order Mac since they want to sell us a stripped down version of ML.