He has an Intel Mac and has Win XP installed. He wants to upgrade to a newer Mac. He knows that he can install and use his copy of Win XP on only one machine, and he plans to have it installed on the new Intel Mac.
As far as I know, you have to call Microsoft when installing and activating XP on the new computer, to explain to them why they should let you use the software you legally acquired on your new computer.
I don't bother anymore, after having changed PCs a lot years ago and using my legit XP on each new one, well probably the forum charter forbids me from saying what I do now, but I'm sure it's obvious And much more trouble-free.
There's no way to deactivate Windows XP, you just have to call Microsoft and ask them for an activation code. I did that when I wiped and re-installed XP on my P4 last year, and I had no problems whatsoever.
I've moved my copy of XP Pro to three different computers over the years and never once had an issue. I once had to phone a toll free number a few years back and they issued me a new activation key. It was an automated site and I had to choose a "reason" for the new key and I just selected the "new HD option".
Since I was putting it on a brand new computer, this was technically correct.
The last time I moved it, there was nothing at all to do with MS. I just activated it online without any questions from MS.
It seems that now that Vista is out, they no longer police XP Pro.
I have a legitimate copy of Windows XP Pro which I installed on my black Macbook.
When I purchased an iMac, and installed Leopard, at one point Leopard asked me if I wanted to migrate my data from an older computer. I did and everything works at 100%, including Windows XP on Parallels.
Subsequently, I purchased a Macbook Pro and did the same. All three copies work perfectly, and I ever had to resubmit my key from the disk package.
Regardless, there exists a file called Keyfinder.exe that can generate your original key, without having to call Microsoft.