I run latest Parallels version on Retina Macbook Pro to develop for Windows8/Windows Phone8, Android, HTML5 and iOS. Everything works great, BUT the emulator of Windows Phone 8 fails to start. The error message is: ============== The Windows Phone Emulator wasn't able to create the virtual machine: Generic failure To overcome other issues, I have already changed memory of virtual machine to 3GB, according to your document http://kb.parallels.com/en/113875. This article describes this crazy showstopper issue in details: http://www.nsilverbullet.net/2012/10/31/windows-phone-8-sdk-on-mac-osx-parallels-8/ As a workaround, in Germany I will be able to buy a Lumia 920 next monday. But I also need to test different screen sizes and resolutions.