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Windows 10 support quietly extended until Oct 2027, as users reject Windows 11
(www.windowslatest.com)
This is a most excellent place for technology news and articles.
Depends on the manufacturer and if you purchased in store VS online. Also, every computer purchased online has the full specs and if you know what to look for you won't be taken advantage of by the nerd that looks like they know about computers but really only talks up the most expensive one.
Yes, depends on the manufacturer
And relevant xkcd - https://xkcd.com/2501/