up until last year I was supporting a system for a client that would only run on Solaris 2.5.2 from 1996 or so. (finding working versions of the hardware was be

up until last year I was supporting a system for a client that would only run on Solaris 2.5.2 from 1996 or so. (finding working versions of the hardware was becoming _really_ hard). The system was retired last year, replaced by something that costs several million dollars, but until then I had no choice. There are other things like that out there. I think I recall seeing something on HN fairly recently abut a controller for some CNC machine that was running an early version of MSDOS. Again, replacing with something more modern was very expensive. These things exist and the users aren't necessarily being wilfully malign in not upgrading