Web developer needs MS OS for testing

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http://forums.fedoraforum.org – Being a LAMP snob, it pains me to even think these thoughts, but ... I'm running FC-9, and developing websites, mainly using PHP - well the whole LAMP thing. I now find the need to test/code for IE. To that end I'm thinking VMware, VitrualBox, etc. ... loaded up with that "other" OS. I'm sure others have gone down this path. I'm guessing the answer is Win-7. My main question is: OK, I do a virgin buy and install and register it on my VM. Six months later I want to change from VM-X to VM-Y and I reinstall - what is MS's feelings on VM's. Thanks (HowTos)