Retail Full Package Product (FPP) This is the most expensive retail product of all and includes the fewest restrictions of any Windows version. You can install it on any PC, new or old. You can boot from the installation media and set up Windows 7 on a PC with a squeaky clean hard drive without having to jump through a single hoop. You can install it on any Mac, in a virtual machine or using Boot Camp. You can install it in a virtual machine in Windows as well. You can even use it as an upgrade for a previous edition (although you pay more for the privilege than you need to).
Two other noteworthy benefits of an FPP copy of Windows are these:
You can uninstall the OS from a computer and transfer it to a new PC, something you can’t do with an OEM copy of Windows. Microsoft briefly considered restricting this option when Vista was almost ready to launch but retreated in the face of a fierce backlash from customers
You get free technical support directly from Microsoft, rather than from the hardware maker.
FPP products are premium-priced, but for some circumstances they make sense. And for customers who are willing to pay that premium to have no license hassles whatsoever, this is the way to go.