https://en.wikipedia.org/wiki/Microsoft_POSIX_subsystem
When Windows Services for UNIX came to be, it was already too late to matter, it wasn't really from Microsoft, and came with its own set of problems.
I am speaking from when Linux was still in baby steps, and basic stuff like ELF had just been added with the kernel version 1.0.9, in 1995.
Things could be even more different, had Microsoft kept Xenix, which was my introduction to UNIX, and one of Bill Gates darlings, actually.
https://www.theregister.com/2002/03/20/bills_vision_for_the_...
"The Future of Xenix"
https://archive.org/details/Unix_World_Vol02_10.pdf/page/n21...