Filed under: Products and services, Launches, Microsoft (MSFT)Microsoft Corp. (NASDAQ: MSFT) is goosing the licensing requirements for its Windows Vista operating system by allowing the operating system to be installed on personal computers without hard drives. This sounds a little mundane, but with almost every PC these days coming with an internal hard drive (where Windows Vista is usually installed), times have changed and some PCs are actually more like display terminals for data exchange than fully-functional computers with all those advanced technical innards.As such, Microsoft wants to ensure Windows Vista can be used on "virtual PCs" that may be physically located in some server room instead of on a corporate desktop. All that computer storage (in the form of a hard drive) may just be sitting in ...