Install Two Versions of OS X on One Mac Using Parallels

Mactuts+:

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!

If you’ve ever needed (or wanted) to install a second version of OS X for any reason, check out my latest screencast over at Mactuts+ that explains how to use Parallels or VMWare Fusion to install a second version of OS X as a virtual machine.