Microsoft has just open-sourced it’s Windows Subsystem for Linux (WSL).
https://blogs.windows.com/windowsdeveloper/2025/05/19/the-windows-subsystem-for-linux-is-now-open-source/
This is major. WSL runs the FOSS Unix knock-off on their closed source and expensive operating system, making it possible to host Unix applications on it. Cynics might think this was a ploy to still sell a Windows server license instead of people running Linux direct on the hardware. Or you could say it allows lower skilled Windows administrators who couldn’t cope with a command line to still access Linux applications.
Since it first appeared, people have been questioning Microsoft’s open source credentials, as WSL was closed source. Not now. You can get at the source code, customise it and run your own version.
This is great news, but as with anything Microsoft, it’s probably another cyber security attack vector for Windows.