Microsoft has clearly decided that "Windows" is now the new Metro UI. The old stuff is there for backwards-compat and pro/business market reasons, but the futur

Microsoft has clearly decided that "Windows" is now the new Metro UI. The old stuff is there for backwards-compat and pro/business market reasons, but the future is Metro. Now, you may not like that decision, but I think that's where they're going. Given that, it doesn't make sense to call them two different things since their only differentiating factor is whether they run "old"-style apps.