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Running Windows on bus screens at Schipol Airport
(slrpnk.net)
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That's not the case. Usually governments and public organisations go throw a volume licensing agreements that sees them taking more than just windows. It would usually include things like windows, office, a bunch of enterprise applications, as well as support on top of it all.
Microsoft usually relies on those agreements to push software that might not be needed.
Another reason could be the video display management system they used to remotely control these screens. The software might only run on windows.
Thanks for the clarification! ๐