Then I would say that building software that runs exclusively on MS is a bad idea. That's the reason I don't use .NET and I have never poked inside a metro app

Then I would say that building software that runs exclusively on MS is a bad idea. That's the reason I don't use .NET and I have never poked inside a metro app. And it is a reason for the explosion of the Appstores for mobile and webapps in general, startups want to bet on something that's not MS. I guess not a single one of the YC companies writes exclusively windows software. Multiplatform software for the win.