Linux usage on Microsoft Azure cloud has now surpassed Windows usage, according to Microsoft Linux kernel developer Sasha Levin, demonstrating how far the open source OS has come since former Microsoft CEO Steve Ballmer called Linux a "cancer" back in 2001. 

This milestone is not a surprise: Linux now runs most enterprise computing both on in-house servers and in the cloud, our sister site ZDNet noted. Linux had 68% of the OS market share in 2017, IDC found, and has only increased since then. Meanwhile, Windows Server has been declining for several years. 

SEE: 20 quick tips to make Linux networking easier (free PDF) (TechRepublic)

"Every month, Linux goes up," Scott Guthrie, Microsoft's executive vice president of the cloud and enterprise group, told ZDNet last year. "Native Azure services are often running on Linux. Microsoft is building more of these services. For example, Azure's Software Defined Network (SDN) is based on Linux."