Same thing they did to Novell..
... stole their NFP code and made it into Windows for Workgroups to steal their customers while pretending to be interested in a merger. Unquestionably a rip-off, blatantly unfair, ethically indefensible.
Someday we will rub the feces of their own behavior in Gates' and Ballmer's faces. Until then, we must bide our time.