Well, it's finally happened. Microsoft has released a product containing its own Linux kernel: Azure Sphere. It's not MS-Linux or Linux Windows, but it's still remarkable.
Azure Sphere is a software and hardware stack designed to secure edge devices. It includes microcontrollers, "Azure Sphere Security Service" and, the really interesting component, the Linux-based Azure Sphere operating system.
Microsoft made no bones about it. Microsoft President Brad Smith introduced Azure Sphere saying, "After 43 years, this is the first day that we are announcing, and will distribute, a custom Linux kernel."
Linus Torvalds once said, "If Microsoft ever does applications for Linux it means I've won." He's won.
Microsoft has also completely embraced Linux on its Azure cloud. By late 2017, over 40 percent of all virtual machines on Azure were Linux. Today, Microsoft supports over half-a-dozen Linux distros on Azure. This includes CentOS, CoreOS, Debian, Oracle Linux, Red Hat Enterprise Linux (RHEL), SUSE Linux Enterprise Server (SLES), openSUSE, and Ubuntu.