[robotnikman]

Yep. From what I've seen, usually it's a case of a company building something which uses it a long time ago, and not bothering to switch to an alternative because 'If it works don't fix it'. It may not be the newest and shiniest, but if it's working well then no need to move to something else.

[gerdesj]

I have customers with DOS (6.2, so quite modern) controlling machines.

I ended up wedging a Samba daemon between that and PCs running Windows 10. I mount the DOS box's share via mount.smbfs and re-export it via Samba. The machine is on a rather sparse VLAN!

I have many other horrors on isolated VLANs across the UK to worry about ...

[calvinmorrison]

And here's a great point to install a proxy web server like nginx, add rate limiting, filtering, whatever you want, at least the ancient IIS/whatever http server is not publically facing