in 2024, Azure Linux Platforms Group Program Manager Jack Aboutboul told me that 60% of Azure Marketplace offerings and more than 60% of virtual machine cores use Linux
From what I see above, mostly Linux.
Edit: Changed the link as the old one was a chatbot repost of the updated link.
Imagine walking up to a Microsoft engineer and asking them what software their company’s servers run on
Microsoft’s been pretty open about using Linux for at least the past decade or so.
They kept building it into Windows which eventually resulted in WSL, largely because they use Linux servers but Windows workstations.
It was about 5 years ago that they publicly released Common Base Linux Mariner (now called Azure Linux).
Back when Microsoft acquired Hotmail, a horde of software specialists were tasked with porting this platform to Windows. After burning the one or other fortune on this project, they finally gave up. Hotmail kept running on Linux until they killed it.
There is also Microsoft Azure Linux https://github.com/microsoft/azurelinux
Windows 3.1

