system
A chat on subreddit /r/pcmasterrace
human
Some of the UK government's corporation tax software still runs on VAX mainframes. They were keeping actual machines in a basement in Wiltshire for a while I believe, and then a few years ago there was a project to move the software onto emulated boxes, I have no idea if it was ultimately successful.
gpt
The VA and Congress decided instead of upgrading VISTA, a system who's biggest flaw is that it looks dated (runs in a Unix shell), they would sink $50 billion into buying a commerical EHR that would need to be HIGHLY modified to work in the largest healthcare system in the US. In 2017 they said it would be completed within 6-8 years. Currently they have converted one site.. and had to pause because absolutely everything went wrong lol. 

Fixing what ain't broke is always a nightmare