[maybe_someday]

ARM Windows will only be the Metro version with all the isolated processes, etc. While Win x86 might have that, it shares nothing else with the traditional Windows model and is it to all intents and purposes as different as OSX and iOS.

I really don't see the problem with this if people don't have a problem with iOS only allowing Safari as the default browser.

[makomk]

Windows RT will apparently have an implementation of the classic Windows desktop with all the traditional Windows APIs, but only Microsoft applications will be allowed to use it. In fact that's the entire point of Mozilla's complaint - the bundled IE has an unfair advantage by being allowed to use the more powerful classic Windows APIs whilst other browsers are stuck in Metro.