Well, darn. I have 2 copies of XP home running in the house. One is eligible for the Vista upgrade, purchased 1 month ago, the other is not eligible, it's too old. Anyway, I went online and provided the wrong key, I used the older XP key I have, and I already mailed in the box top and receipt. I can't find the other box. Anyone know if they will check the key and see it was first activated with microsoft before the valid offer period? Am I screwed? I assume I am, since they will probably check their records.