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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.
Vista was a terrible OS. You can't just ignore the hike in hardware requirements as if it wasn't one of the defining parts of the Vista experience. It's not just that people didn't have the hardware to run Vista; people bought new hardware with Vista preinstalled that ran like dogshit! In other words, people essentially paid to have a downgrade. An OS that doesn't run well is bad and no amount of features can change that.