In the last 10 years I haven’t had a single contract dealing with a windows server. Im sure that someone somewhere does indeed use it. But it’s gotta be 90%+ now a days Linux.
Here in Australia it's a rare thing for me to see a Linux server. They exist, sure, but are generally in the minority.
I have some self-selection biases as well, but I regularly work for large orgs with more than 10K staff and I've been to orgs with over 1K IT staff, and in all cases Linux servers were 30% of the fleet or less.
By some[1] metrics, Windows Server is about 50% of the worldwide server OS market[2]: https://www.t4.ai/industry/server-operating-system-market-sh...
[1] Market research related to server OS usage is notoriously unreliable, with idiotic things such as counting "NGINX" load balancers as a "Linux web server" even if it is one tiny load-balancer VM in front a whole fleet of Windows IIS servers running ASP.NET. There are also the "hyperscalers" that skew distributions. The FAANGS alone add hundreds of millions of Linux instances, but in huge farms of essentially identical clones. At a single medium-sized customer, they have over 1K distinct Window Server VMs or HA pairs, but they also have 1x HPC cluster with 1K Linux nodes. Do you count that as "1" Linux install, or "1000"?
[2] Again, is it just counting the "for money" market, or just the "list of all systems used for servers, including the unsupported free distros?" Microsoft doesn't publish a separate line-item for their Windows Server revenue, for example, making it hard to determine how much it's still being used.
Huh, here in Norway, for big oil service companies, for government and electricity infrastructure, the wast majority of servers I see are Linux in the cloud.
Last time I saw a Windows server was a month before the pandemic, some old stuff that I inherited from another consultant that had been squatting there since last millennium I think.
Windows is exceedingly rare, from a Silicon Valley perspective. The sales people often (not always) ask for windows laptops, but that's it. Everyone else is Mac or Linux. Servers are 100% Linux in the last decade, before that it was either Linux or Solaris. I've never encountered a windows server in 25+ years in the field and never used it myself for anything other than gaming.