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I have Macbook Pro ( late 2011) which I recently upgraded to Yosemite and works fine. It has only one hard drive which is 256GB SSD (Samsung). After purchasing I received Mountain Lion as an app in Apple Store and it is downloaded and Apple is not going to ship physical CD.

I want to install Mountain Lion as virtual OS within Yosemite using VirtualBox because VirtualBox is free. Is it possible to do that without making my system unstable (a risk I cannot take) ? Does any one had issues with this type of setup or anything I should be aware of? Is there another more stable but free alternative to VirtualBox (other than Apple Bootcamp but I do not like having to shut down my primary OS and rebooting to Mountain Lion) ?

  • Your host system should have no trouble. I've installed Yosemite in VirtualBox and the guest is a bit slow/buggy, but Mountain Lion should be better. – 0942v8653 Jan 27 '15 at 13:25
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It shouldn't make your system unstable since it runs in its own "box" per se.. I have done it for other operating systems such as Ubuntu, Windows, and older versions of OS X.

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