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Whoa! Windows 7's market share surged, tripling in users last month
(www.pcworld.com)
This is a most excellent place for technology news and articles.
Still, it's unusual for that to happen.
Ehh, bots have always presented nonsense UAs to servers. And since modern browsers hard-code the OS version in the UA string, pretending to be an old browser on an old OS could be a (probably ineffectual) way to bypass fingerprinting.