While these statements indicate the OEM version is tied to the first
computer it is installed upon, it would be more correct to state the first
computer upon which it is activated upon. (You can install to your heart's
content. But, as with any version, it ain't valid until it's activated.)
Only live support from MS will be limited. Knowlege base, newgroups and
forums are still available.
Lastly, you can upgrade any piece of hardware you want with the OEM
version,
including the motherboard, but at some point the amount of change will be
considered a new computer and trigger the requirement for re-activation
(and
MS does not have to provide the activation string to keep it alive per the
license if it is not the original make-up of the machine.) Typically, this
is a fairly significant amount of change, although a new motherboard is
almost always guaranteed to trip the wire. In the event re-activation is
required, a phone call to the activation center stating a broken part was
replaced and this is the only computer with this PID in use will get it
reactivated. (I've swapped out graphics cards, added memory and a DVD
player
and not triggered the event.)