This topic is somthing ive looked into and spoken to a few people in the know. the company i work for prints a lot of the booklets, and genral print of microsoft UK
We all know we can reactivate XP OEM, we call them up, give them a story of some nature and your XP is re activated. we have all done it. but from what i understand, microsoft are not going to be as easy going with vista! the same product keys being used over and over will stop as once activated it will be loged. so that product key can no longer be activated.
its not a case of i will tell them a lie or to and they will reactivate my vista. if you have a borked M/board and can prove it was borked then microsoft might feel reactivation is ok. great we got away with it this time. next time its another story, each could be loged to your activation key. then microsoft say no to reactivation! you shout and scream down the phone but in the end its microsofts right to say no activation buy another license. microsoft are carefull in saying no personal information is ever taken. but your hardware config isnt personal information. agreeing to the license before install means you agree.
if over a period of 2 years for ex: you have 2 CPU's 2 M/boards. 3 GFX cards. optical drives, hardrives ect ect your PC has indeed completely changed from its original state. I personaly have had about 10 boards on my XP pro OEM. but this isnt about XP its vista and microsoft will be stringent when it come's to reactivation of vista.
I would love to save some money and go OEM but i also know that in the next 5 years of vista i will be upgradeing my M/board CPU ect many times, and for me the price of retail might be inflated, but its a must as i know i will change everything inside my PC within 18 months+ and will always do a fresh install when changing major hardware like chipset, GFX, ect.
forget how many times you have blaged XP on activation, this is vista! with a new license agreement. yes they might activate it again, but they dont have to if you change to much.