You're right that MapPoint is a Microsoft product, but that doesn't mean that Nav Tech has no ability to dictate terms. In the end, Navtech owns Nav Tech data. Microsoft is a licensee of that data, which means they have to comply with whatever terms Nav Tech provides. If Microsoft and Navtech can't agree terms, Nav Tech pulls out, which leaves a MapPoint without maps unless Microsoft finds an alternative supplier. It's pretty obvious that this is the discussion that happened between Microsoft and Nav Tech, and in the end Microsoft chose what they must see as the lesser of two evils (i.e. Nav Tech data with restrictions is better than no Navtech data).