Sasha Levin, an engineer working at Microsoft, said the system using the Linux operating system for Microsoft's Azure cloud platform has surpassed Windows.
Thus, Microsoft has admitted to using more systems running Linux than Windows for the Azure cloud platform. According to the Business Insider, the number of computers has steadily increased over the years, eventually surpassing Windows.
Remember a long time ago when CEO Steve Ballmer was in office, he always considered Linux the biggest threat of Windows. But then when Satya Nadella came to power, the Indian CEO always sought to reconcile the relationship between the two platforms with the plan to help both develop, typically Microsoft joining the Linux Foundation in 2016.
In April 2018, Microsoft confirmed it would develop a version of its own Linux for internet-connected devices. A month later, Microsoft announced it would integrate all Linux kernel (s) into Windows 10.
As for Linux, the platform has never been "open" to competing with Windows in the consumer market, though Linux is the "dominant" in data centers and enterprise servers.