John, member bilyo posted in this thread and you answered. He's also posted his own discussion here;
Both myself and Jimmy assured him that Microsoft couldn't make retrospective changes to their licensing terms, but bilyo raised an interesting observation. He pointed out that your post above mentions "These revised licensing terms apply to all OEM versions of Windows currently sold".
I can't believe that Microsoft means all XP OEMs sold from whenever in the past, and that's why the word 'currently' was used. But 'sold' can be in the past tense as well, so that 'currently sold' could apply to all OEMs that have been sold to date.
I know that interpretation has to be wrong, but is it?
Your insight would be most welcome. Really!