Whats OEM

Original Equipment Manufacture - same product, comes with computer etc, no pretty boxes etc, usually cheaper.
 
Mat said:
Original Equipment Manufacture - same product, comes with computer etc, no pretty boxes etc, usually cheaper.

The most important difference is that you can only install it on one machine.

This means that once you've installed it you can upgrade every component in your PC, but if you change the motherboard you will be asked to buy a new license/copy. Microsoft consider a change of motherboard to be a change of computer.

If you buy the retail version you can upgrade motherboard etc as many times as you like, you won't have to buy a new version of Vista.
 
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