Many institutions and hospitals still use XP. And they pay Microsoft a lot to support it.
Like any other large industrial org, there's some bits of million-pound kit with integrated, essential XP. Likewise old essential software where the support has literally retired, running on 2003. We've got roadmaps for replacing it, but they're not instant.
We manage it as best we can. But broadly we're just about to go to 10 on desktops, so we're not as bad as the police!
It's Windows 7 now, I'm now seeing some staff get Windows 10 machines deployed to them.