[Still Thinking]

I actually ran into a large industrial router not too long ago running on OS/2! The manufacturer wanted some ungodly amount for a Windows version of their operating software, so we had to deal with it as is.

[hoosierham]

I liked OS/2 ,Warp 4 was pretty cool!

But that was at least 10 years ago.

Of course a lot of upgrades are not really necessary if the existing system is doing the job you need.