Agree dev tools don't have to be tied to any OS and come to think about it, the fledgling Windows Phone OS will benefit if there are more people adopting the dev platform if it runs on Linux BUT you have to draw a line somewhere. realize that this is a new platform and they are trying to prioritize resources. What do you think will give Microsoft more bang for the buck? Supporting a platform that is will likely land them a dev or two or making their core platform kick-ass? I think we all know what the answer is.