We are talking about enterprise which is 99% Windows.
Some enterprises are, perhaps most. But tablets and phones HAVE made a dent, and some places are BYOD even at the computer level.
e.g. Google is very far from 99% Windows - and though it is not your standard "enterprise", it is far from unique.
Sure, but why make the commitment to build your whole thing windows-only when you are only a tiny bit away from actually doing it platform independent. Like, for having options in the future, and stuff.
Isn't it kind of the point of web browsers to render webpages in a common open language instead of being a host for proprietary vendor specific plugins? What's the big advantage over standalone applications in that case anyway?