I saw a rant about some department still using win98, and it reminded me, when I was in school the school library used MS-fucking-DOS, windows 10 was already out by that time...
The librarian lady was really surprised I even knew what it was, which meant she knew it was fucking ancient

They probably bought a library management system that was expensive back in the day. You would probably be equally shocked on the sticker price for the updated version.

Yeah don't blame the library. Third party software vendors used to charge egregious amounts for software upgrades to support new OSes.

Lots of hospitals in the same vein use really old versions of Windows. Many public utilities/services are caught in this bind. It's part of why some EU govs were looking into switching over to Linux (don't think it panned out very well).