Windows 7: Activate Windows 7 with OEM licensing?

Yeah Noel, I hear you. Your arguments are valid. But if you have to buy 5 licenses like I had to, it saves you a bundle. And I never had any downsides.

Original Equipment Manufacturer.

The licence for the copy of Windows is only valid on that computer and can't be transferred to other computers....
The OEM software is licensed with the computer system on which it was originally installed and is tied to that original machine.
OEM licenses are single-use licenses that cannot be installed on more than one computer system, even if the original machine is no longer in use.
The End User Software License Terms, which the end user must accept before using the software, states that the license may not be shared, transferred to, or used concurrently on different computers.
System builders must provide end-user support for the Windows license on computers they build, but cannot support licenses on computers they didn’t build.
This is a fundamental reason why OEM System Builder licenses can't be transferred.

...from teh OEM SB license...
<quote>
2. Authorized Distribution and Acceptance. To distribute the Software or Hardware in this Pack, you must be a System Builder
and accept this license. “System Builder” means an original equipment manufacturer, an assembler, a refurbisher, or a software
pre-installer that sells the Customer System(s) to a third party. You accept this license when you open this Pack. If you choose not
to accept this license, promptly return the unopened Pack to your distributor. You may only distribute unopened Packs within your
territory. For the territory in which you may distribute, see www.microsoft.com/oem/sblicense/territory. Individual Software or
Hardware units may not be returned after the Pack is opened.
</quote>