I'm not even sure which standards you're worried about, either. VC++ supports C++14 pretty thoroughly, and you've got various builds of gcc or clang if you want whatever extra support they give you. We're long past the dark days of yore when support was hit or miss and MS didn't give a shit.
If you want POSIX, you are out of luck, but that's fine, because Windows isn't a Unix, so POSIX doesn't apply. My view is that this is actually a pretty good thing, but reasonable people may differ - e.g., by thinking that this is a fantastic, amazing, excellent and extremely good thing ;)
Overall: the really weird thing is that Windows support is no harder to arrange than support for any other platform. But because it's so unpopular with a certain brand of nerd, it's somehow OK to just code for POSIX, complain when your code doesn't build on Windows, and blame the whole affair on Windows. But, dear people that do this, I'm afraid you appear not to have noticed that portability is your job, not platform vendors'.
