I personally witnessed a take out of a Novell 2.x file server which had a 16 year uptime. This was for a school system, and they had forgotten where the file server was. Stuffed in the back of a janitorial closet, and dust covered.
Was there a sign on the door saying "Beware of the Leopard?"
Each new user of a new system uncovers a new class of bugs. -- Kernighan