[quote name='NoDAK']The Dream Car Challenge had an expiration on the redemption codes only. Once applied to your live account their was no expiration. In fact one of the guys I gave my points to (I had no 360 at the time) has yet to use his points.[/QUOTE]
Did
you actually try one of the codes after the expiration date? I asked around, and nobody I know waited... They all redeemed the codes before they expiration date, and most used the MSP just in case. As far as I know, the actual codes from that promotion may not have expired either.
But, as you confirmed, the MSP definitely did not expire. I know quite a few people that still have MSP left from that promotion, especially the non-stackable 100 msp codes that got redeemed into booster or secondary accounts.
Personally, me thinks the whole expiration date is a scam to get people to spend the points buying stuff they wouldn't otherwise... "Hey, the points are going to expire anyway, so I guess I'll buy a music track, or that XBLA game I was on the fence about"... And then when new DLC comes out they want, they have to go buy MSP cards... If people knew the MSP is not expire, they would sit on their points until there was something they really wanted.
Course, the GTA IV case showed us that technically the MSP could expire, too... And, we all know that certain codes expire... So, that little bit of doubt is all that is needed to throw suspicion on all the promotion points, especially those that don't clearly specify what the expiration date applies to...
Again, use this site to check your points if you think some of them may be expiring soon:
https://billing.microsoft.com/