Hannah Montana Linux is too good to be listed, if we at Microsoft acknowledged it's existence we'll have to admit that Linux is clearly superior and that's a threat to our bottom line.
You're like 20y late with this joke. MS runs their servers on linux nowdays.
They already have WSL and their own Linux distro.
Give them another 5 years and they'll have rewritten their core to sit on top of unix and will have become a simple commercial linux distro. When buying a windows laptop you will be able to click through 5 yes/no promts, unlock the terminal and yum -S gnome-desktop to break free. No dual boot needed.
You know what's the worst part? M$ will be the biggest contributor to the kernel. And that's how linux will die.
I once saw a webcomic many years ago with a straight couple in kink gear in front of a computer, and the guy was saying something like "You've been a bad girl, I'm installing Windows ME on your computer."