Pisces writes "Over the past several days, Microsoft has flip-flopped on virtualization in Vista, with one ascribing the change in policy to concerns over DRM. A piece at Ars Technica raises another, more likely possibility: fear of Apple. Apple is technically an OEM, and could offer copies of Vista at a discounted price. 'All of this paints a picture in which Apple could use OEM pricing to offer Windows for its Macs at greatly reduced prices and running in a VM. The latter is absolutely crucial; telling users that they need to reboot into their Windows OS isn't nearly as sexy as, say, Coherence in Parallels. If you've never seen Coherence, it's quite amazing. You don't need to run Windows apps in a VM window of Vista. Instead, the apps appear to run in OS X itself, and the environment is (mostly) hidden away. VMWare also has similar technology, dubbed Unity.' Is Microsoft terrified of a world where Windows can be virtualized and forced to take a back seat to Mac OS X or Linux?"