We still have at least one Windows NT 4.0 machine running 24 hrs a day 365. That was a good vintage.
They used NT server 3.51 on a computer at work when it came out and our department jumped onto NT 4.0. It was created by some DEC brainiacs that MS had hired to build them an adult OS. That distribution disk would install NT on Intel, DEC or Power PC architecture. Remind me again HOW we have moved forward.