(OK, I assume there's a small number of developers who develop, or at least debug, for both systems and prefer windows as a development environment, but I assume that number is small, at least on Microsoft's scale).
If you're developing to deploy on Linux but are more of a Windows dev, this helps you, but that doesn't help Microsoft ship more server OS licenses.
If you're a Windows dev this is irrelevant.
If you're a linux (or posix only) dev I don't see how this helps you much. It does help a person like me, who only uses Windows when I need some weird tool like a compiler for an exotic embedded part or vendor-supplied FPGA tool that only works under Windows -- again, not a large enough market t move the needle.
Could the market be CIOs? I.e. demonstrating "hipness" in a way that can be verified when the CIO asks the devs "does this really work the way MS claims?"
Obviously it's not opening the huge number of popular Linux desktop apps to the Windows environment. :-(