Virtual desktop software, such as Parallels or VMware Fusion, makes it incredibly easy to run Windows applications on a Mac. But what if you wanted to run another version of OS X? In this screencast, I show you how to install both OS X Lion and Mountain Lion using Parallels, allowing you to have multiple versions on the same Mac at the same time with no dual booting!
Install Two Versions of OS X on One Mac Using Parallels
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