And people still continue to use windows
Its a business liability and often not even needed. A read-only signed secure OS (like chromeOS) and google apps for business is not only cost effective , but very secure.
Sadly you can't get idiots admins to push simple patches, let alone radically review OS policy.
Windows is a malware cesspool, all versions, no windows 10 rollout is going to fix that if anything win10 is worse, constantly telling me I need to go online and download an app to do something that used to work out the box on previous windows)