British nuclear subs were running Windows XP until at least 2017. It's easy to google, but the best article about it is No, Trident doesn't run on windows XP (https://ukdefencejournal.org.uk/no-trident-doesnt-run-window...), which ironically makes it very clear that Trident subs were running on Windows XP and had no plans to replace it.
Most UK government excuse: "The programme undertaken by the Royal Navy and BAE Systems to equip the fleet with a Windows-based command system was completed in just 18 days."
Translated: "You couldn't do better in 18 days, so you don't have a right to worry or criticize. Also, don't ask why this was pushed off until the last 18 days of the project."
Huh, back in the 2001/2002 timeframe I worked at an old company that gave everyone a Windows laptop but us engineers also had UNIX accounts on the server cluster, which we logged into for dev work.
Our company was hit with one of the worms (don’t remember which). Thousands of emails constantly coming in and everyone scrambling to delete them - except people like me, who were on vacation. I returned to an inbox that instantly crashed Outlook. IT was trying to find a solution. But I logged into the UNIX cluster, opened Pine, and deleted all the crap, page by page. When I got most of it done, Outlook started working again.
IT was shocked but then told everyone else to go do what I did, eliminating their need to do any work. So I guess you win some and you lose some..
ILOVEYOU was in 2000 and behaved that way. I remember we just shut off our Exchange servers until there was a fix. Email was still new enough that the world didn't implode.
Yeah I get the point, I'm saying it's not really a good point, running Windows and Outlook on a secondary system is fine. Forcing the astronauts to learn to use some other system would be a waste of time and probably worse than whatever it is you see as the problem.