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Steam has now officially stopped supporting Windows 7, Windows 8, and Windows 8.1.
(www.theverge.com)
This is a most excellent place for technology news and articles.
I think StreamOS has been around longer than the Steam deck, actually; but I'm sure it's been tailored somewhat for the hardware.
SteamOS was scrapped and rebuilt. SteamOS 2 and 3 aren't related at all.
Yes, but the previous version has been based on Debian.