I believe that businesses are allowed to give special deals to customers of their choice as long as they don't discriminate based on race color religion sexual

I believe that businesses are allowed to give special deals to customers of their choice as long as they don't discriminate based on race color religion sexual preference, maybe age? It's really just a question if it is in MS interest to make sure their "partners" always use MS products instead of those of the competition. It's not a question of ethics. I think the term is "price differentiation". Some people get it cheaper.