There is a Free binary-compatible Open Source alternative to Windows being developed, ReactOS (https://www.reactos.org/). This could be an unencumbered leg to rely on when/if Windows prove more and more troublesome, and would be a boon to run within a VM such as VirtualBox or VMWare on any x86-compatible platform.
Have your developers investigated ReactOS in terms of maturity and viability. I think many NT users would be happy to be able to switch to a Free alternative.
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