NT4 uptime measured in years
My personal file server is running NT4 Server (SP6a) and has since 1998 or so. It has only ever been shut down due to hardware failure (fans, drives) or extended power outages. Uptime is normally measured in years. It just sits in the corner quietly doing its job of domain controller, DNS, DHCP, VPN, file sharing, printer sharing without complaining. Previously hosted a website getting 100,000+ visitors a day and the only issue with that was MDAC falling over because (shocking) Access DBs aren't designed to be hammered like that. I keep thinking I will shut it down and replace it with something more modern, then I think "It works, why downgrade it to something that needs to be rebooted every 2nd Tuesday for updates?".