The thing increasingly forcing me away from Microsoft isn't the adoption of new frameworks -- I'm spry and can roll with the changes. What kills them for me is the constant change in frameworks plus little to no support for forward compatibility on existing systems (they used to be much better at this part of it, but have totally dropped the ball on it more recently).
Typical modern Microsoft:
"Okay guys, now we're doing everything in API-Y which is quite different than API-X. And API-Y apps don't run on Windows version I which 90% of the market is running, they only run on Windows version J and higher, which 4% of the market is running."
Yeah, that's not cool, especially if you're doing this just about every time a new Windows version comes out.
Typical modern Microsoft:
"Okay guys, now we're doing everything in API-Y which is quite different than API-X. And API-Y apps don't run on Windows version I which 90% of the market is running, they only run on Windows version J and higher, which 4% of the market is running."
Yeah, that's not cool, especially if you're doing this just about every time a new Windows version comes out.