A UK financial institution...
...I did some work for as a consultant had a similar experience. There was a server running OS/2 (this was a few years ago but even then it was old) but no-one knew where it was. It ran a really specialised piece of software that had performed its function perfectly for years so it was left to its own devices.
Eventually we decided to find it for DR purposes and we had to work out which ethernet cable belonged to it and follow it back. This server was also in a wall void although it wasn't very dusty so it wasn't too filthy. We moved it and shortly afterwards, it was replaced. I wish we'd left it where it was and it could have been a sort of computing time capsule.
Biting the hand that feeds IT
