It accepted my serial number, and my coupon. Warning, though: you can't check out with Firefox. It's one of those stores with "check out" buttons that are invisible in Firefox. I had to switch to IE, then type in everything all over again (including that mile-long serial number). Happily, it did take my coupon code again. I was afraid it wouldn't, since the e-mail warned that the code expires the moment you submit it.