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by nickpsecurity 2393 days ago
Russinovich claims it was an OpenVMS clone and upgrade with some convincing evidence:

https://www.itprotoday.com/compute-engines/windows-nt-and-vm...

That gave them a huge lead in developing a server-grade OS. They probably just used OS/2 for the OS/2 part that ran on top of it. Fast forward to today, the result still isn't robust as its predecessor in cluster configuration or the AS/400 Microsoft ran on before using their own product. They did show how much better VMS could've been as a desktop... by dominating on the desktop. :)