I've spent some time doing this. There's always old systems people don't really understand, ownership is poorly defined, and no one knows what happens if you tu

I've spent some time doing this. There's always old systems people don't really understand, ownership is poorly defined, and no one knows what happens if you turn it off. It's archeology. Understand what the system is doing and how it interacts with other systems and the business. If it looks unneeded back it up, stop the VM, wait and watch for fallout, and eventually terminate it.