Should Microsoft not act in it's self-interest? If you are critiquing Microsoft for doing that, you should be critical of Google for tracking you -- after all, couldn't they just charge for services?

At the end of the day, consumers will know that "Do Not Track" is on, and that big advertising networks are igorning it. They won't know or care about the T's and C's of some agreement.

They'll also know (because Microsoft will tell them) that Bing, Outlook.com, etc will respect DNT.