I once worked an OS/2 system that was up for over 5 years. OS/2 2.11 on a PS/2 Mod 80. It was a print server and sat under the table the LaserPrinter 4029 sat on in the printer room. I only had to look at it because the date was wrong after February 28th, 2000, . The print queue got moved over to an Windows 2000 Server, where the date was right but the queue went offline weekly, which was resolved by rebooting.