OEM Vista long term usefulness? (transfer questions)

I've been searching and researching through the forums. I just want to have something clarified for me.

Currently, I have a XP 32 OEM computer with which I plan to upgrade the 7900 GTX to a 8800 GT card and install Vista (haven't decided on 32 or 64 yet, but that's another subject). I also have a MacBook, and I want to set up Boot Camp with XP so I can do my programming for my CS classes in Visual Studio 2005 on my laptop.

So can I uninstall my OEM XP from my desktop, move it to my MacBook, and install Vista on the desktop? And if I go with OEM Vista (Premium), if I decide to do a rebuild of my computer in a year or so with a new mobo, RAM, and CPU, will I still be able to reuse my copy of Vista? Or should I buy retail since I will likely rebuild my computer at least once during the lifespan of Vista?

I know lots of similar threads have been posted and I've read them but I want a definitive answer in this case especially regarding the transfer of XP and the usefulness of an OEM Vista copy for future computer builds.

Thanks in advance for any help.

For an OEM installation, that copy of the OS is registered to the motherboard and not transferable. This is teh same for all OEM installations - They are married to the motherboard they are installed on. So the short answer to your question is "No, you cannot uninstall XP from your current PC and move it to your MAC to run in Boot Camp." But you can call M$FT and get a new key if you need. You just may need to pay for the priveledge. This is why people buy retail copies of the OS - You can put it where you want, when you want, just so long as it's on one computer at a time.

Thanks. I've read the sticky. What I really wanted to know was if I TECHNICALLY could move the OS despite legality issues. Thanks for the info.

If you activate it more than I think 2 times within 90 days (or maybe 180 days) you have to call MS, tell them your key, answer a few questions and they give you a new activation code. There is no paying anything to reactivate your copy.

Typical questions will be like,

Why are you reinstalling the OS?
Is it on more than one computer?

Up until the past couple years, I've never heard of DIY'ers buying a retail copy of Windows. It's always been OEM. Apparently MS's documents on licensing must be too advanced for the newer generations of builders to comprehend.