Multiple custom Linux OSes at this point. WSL2 is a custom, mostly transparent Linux VM tailored to fit nicely on desktop windows for developers. The play (as

Multiple custom Linux OSes at this point. WSL2 is a custom, mostly transparent Linux VM tailored to fit nicely on desktop windows for developers. The play (as I see it) was that losing mobile really shook them, and now they have no sacred cows to protect. Developers want and need to develop on linux, so microsoft is making that happen so that they can keep selling software.