iChat revisited Why is Microsoft integrating IM into the OS bad, while Apple integrating it into their OS good?

From a consumer welfare standpoint, a better IM experience is good and integration with the OS might be a prerequisite. This is certainly what Microsoft cries whenever the puny DoJ thinks about enforcing anti-trust law. But monopolies have different economic incentives than entrants, and so different regulatory regimes should apply. Apple has a puny market share so is very focused on improving its product, Microsoft just wants to keep everyone else out. Microsoft honestly beleives it is not a monopoly because it does not yet control all digital information and therefore does not feel its actions are wrong.