Microsoft’s move to embrace Linux is undoubtedly driven by changing macroeconomic conditions around the PC business. For decades, as the dominant server and consumer operating system, Microsoft had very little reason to play nice with others or work to emphasize interoperability. The explosion of the mobile market and the company’s complete failure to penetrate it has left it little option but to seek other types of collaboration and cross-platform support. Building products that work seamlessly across both Linux and Windows is one way for Redmond to ensure it remains relevant across the data center and server markets.

https://www.extremetech.com/computing/239616-hell-freezes-microsoft-joins-linux-foundation