Originally Posted by jano915
so ur telling me if u were building 2 computers you would buy 2 copies of microsoft vista?
Right. It's just like anything else. You need to buy a separate copy for everything/a volume license if you are using it on more than one system for yourself/company only.
Someone else mentioned it, but usually colleges get all kinds of software (AV, OS, Office) cheap and sell it to students even cheaper.