The question was, can I activate XP on another computer at the same
address. You say no. I say yes.
His question was about having it on multiple computers at the same time
(whether it's at the same address is irrelevant, except to demonstrate that
he clearly means at the same time).
That is in violation of the EULA.
You are not "supposed to," unless one removes the original copy. But
if you do remove the original copy, you are allowed to.
As I said earlier, you are allowed to *if* it's a retail copy, but not if
it's an OEM copy.
Where do you get your information about "unlimited # of times?"
The last time I had to call Microsoft was to activate Windows that I
installed on the SAME hardware too many times.
Unfortunately the message you get is erroneous. It *does* say "too many
times," but that's not the way it works. You have to reactivate if you make
too many hardware changes.
I don't know why the error message is erroneous, but my guess is that it was
originally planned to be "too many times," but when they changed the plan,
they forgot to change the error message.
Besides, it's irrelevant. The issue isn't whether you can activate over the
internet or have to do it by phone, the issue is whether you can activate it
as many times as you want to. And the answer to that question is, quite
simply, yes.
The previous to last Windows installtion I did was the second time I
used the KEY on different hardware. It activated automatically.
After 120 days passes, the hardware record is purged, and you can reactivate
on completely different hardware, whether or not the original version is
still installed. Doing it while it's still installed on the old computer is
a EULA violation, but you can get away with it under these circumstances.
WPA isn't perfect, and in many cases there are ways around it for less
principled people.
This article by the late MVP, Alex Nichol, is old, but it's still one of the
best sources of information on WPA "Windows Product Activation (WPA)
on Windows XP at"
http://aumha.org/win5/a/wpa.htm