For the last few years, Microsoft has stated during event keynotes and in other places that Linux is a rapidly growing operating system (OS) being used within Microsoft Azure. They had proudly stated that 50% of new VMs running in Azure were running Linux. (This is the latest stat I remember Microsoft saying publicly a while back already.) Well, I came across an interestingthat gives some statistics and other information regarding the percentage and overall usage of the Linux OS in Microsoft Azure.
Link: Linux Is Most Used OS In Microsoft Azure