Metro is to Microsoft what iOS is to Apple — starting over from scratch, carrying no legacy baggage or expectations. Windows 8’s “Desktop”, the traditional Windows interface, is like Mac OS X. The big difference, obviously, is that Apple has clearly separated the two, and Microsoft has put them together.
Windows 8, even with both environments, can still be used to power an iPad rival. I certainly didn’t expect to be writing that until just recently, but it’s true. Microsoft has made the right bet and made it look like the recumbent “let’s do nothing and hope we still win” position. Windows 8′s tablet chops are now on the non-ridiculous end of the scale and you could do something brilliant with Metro apps.
For the web to move forward and for consumers to get the most out of touch-first browsing, the Metro style browser in Windows 8 is as HTML5-only as possible, and plug-in free. The experience that plug-ins provide today is not a good match with Metro style browsing and the modern HTML5 web.