In Pictures: App wars - Windows 8 Metro vs. the iP...
Instant messaging: Metro loses
The Messaging app in Metro is as limited as the Messages app in iOS. It's tied to Microsoft's Messenger service or to Facebook, leaving everyone else out in the cold. And it's text-only, like Messages. Again, you'll want a third-party app to get a real IM experience.
In Pictures: App wars - Windows 8 Metro vs. the iPad