More seriously though... Assuming you meant 8 and accidentally hit 9: What it's good for is touch screens. Microsoft decided to have just one operating system for both computers and smartphones (and tablets I guess.) So it is optimized for touch screens, and that makes using it with a mouse kind of annoying. I've only really played around with it on friend's computers and don't own one that has it, so I don't know how well it does performance or security wise. [ russianspy1234's advice column | Ask russianspy1234 A Question ]
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