"Businesses wanting to deploy standard configurations across a number
of machines frequently take out one of Microsoft's volume licensing
programs, set up their own standard distribution then use it to hose
whatever OS the PCs they bought came with. Frequently they are under
the impression that this involves them paying for two Microsoft operating
systems, and sometimes they'll buy (if they can) machines with no OS
instead, in order to avoid wasting money in this way." More at The Register.
August 27, 2002