Lest we overlook the most bulletproof OS ever developed..
Novell Netware, RIP.
We had Netware servers running for years without the need to reboot or do anything with them.
I heard one of our corporate locations had a Pentium Pro Netware office server running continuously for 10 years. When they went to update it no one could find it; it was found in what used to be a small closet that had been drywalled over.
IIRC, the US Postal Service is still on Novell.
Beat *that*, Windows.
VMS is still alive, where the cost is justified, and has uptime measured in decades. That story sounds alot like the true Scottish Railyard story, except it was a VAX drywalled in, with no ventilation and a layer of dust on it. Was the Novell O/S subject to hackers at any time? My money is on VMS for bulletproof.