The early 2009 polycarbonate MacBook was a unibody model .
The earliest models supported in Mountain Lion are the mid-2007 iMac , late 2008 aluminum or early 2009 polycarbonate MacBook , mid-2007 MacBook Pro , late 2008 MacBook Air , early 2009 Mac Mini , early 2008 Mac Pro , or early 2009 Xserve Mac Pro models released as early as 2006 can run Mountain Lion unofficially using an upgraded graphics card and EFI64 simulation .
OS X Mountain Lion