Well they aren't a monopoly. They have what, ~50% market share?
MS had 97% market share and were abusing their market dominance to push others out. Apple isn't doing this, so there isn't a valid comparison here.
MS had 97% market share and were abusing their market dominance to push others out. Apple isn't doing this, so there isn't a valid comparison here.
Duopoly might apply if those companies were using their combined dominance to collude and push other competitors out but that isn't really happening as evidenced by the amount of competitors that are in the market.
You're doing the equivalent of saying "but Dell and HP make PC's". When the case is about Internet explorer.