Hi, This is my 2nd post - i am an active reader only in this forum. I got my new macbook air 2012 / 13" with ML preinstalled. However, I don't know how to get the original copy of ML for the purpose i.e. OS Reinstallation. Is it through Mac App Store? I checked in Mac App Store, still I have to buy it, which I thought I should get it for free. I already registered my machine to apple as well. Thanks for help.