
At today’s Build 2025 Developer Conference, Microsoft announced the open-sourcing of its widely acclaimed Windows Subsystem for Linux (WSL), a compatibility layer that enables users to run Linux distributions within Windows 10 and 11 without the overhead of a traditional virtual machine.
Since its initial release in 2016, WSL has been available on Windows 10, though it differs somewhat from common assumptions. While Linux itself is open source, WSL was previously distributed under Microsoft’s proprietary license. Until now, only the kernel code for WSL 2 had been open-sourced via GitHub, excluding the broader functionality of the subsystem.
With this announcement, the entire WSL codebase—including both its functionality and kernel—will now be fully open source. Microsoft is encouraging community developers to contribute new features and enhancements. In particular, the company invites maintainers of various Linux distributions to actively participate in extending WSL to better accommodate the needs of their respective ecosystems.
For developers, WSL remains an immensely convenient tool. It allows the use of powerful Linux command-line utilities such as bash, grep, awk, and sed directly within the Windows environment. In domains like data science and web development—where certain tools are exclusive to Linux—WSL offers a seamless and high-performance alternative to deploying full virtual machines.
Regrettably, Microsoft has discontinued the Windows Subsystem for Android, which previously enabled users to run Android applications natively on Windows 10 and 11. Whether due to low adoption rates or other undisclosed reasons, the Android subsystem is no longer receiving updates.
Developers interested in following the progress of this initiative can visit the official repository here.
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