Recently I setup RAID1 on my rig, and when I booted into 7, I needed to reactivate. I COULDN'T, so I called Microsoft about the ordeal, and from my understanding, the version I bought online was a builder's version and it expired, so now I'm down $210.00 +tax, to get a retail version. It pisses me off how people work, and tell you it's retail but it's not! I can't believe M$ couldn't just have given me a retail key and be over with it..but I guess not.
Word of advice, don't trust anyone. lol