Sometimes it’s necessary to install an old Operating System, but you really cannot (or don’t want to) get the old hardware out, even if it would still work.
I was in such a position that I had to install Windows 2000 Server. After locating the installation media, I decided it was a good idea to get it running on the 2019 Hyper-V cluster. This actually can be done, but there are a few hoops to jump through.
Update: This was written with Windows 2000 Adv. Server in mind, but I’ve since discovered the same procedure works for Windows NT4 with SP6a slipstreamed.