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There are many new features in windows 8 as compare to that of the old versions of the winodws. You can see the link : Best and new features in windows 8
This will let you tell the new features which leads you to upgrade to windows 8.
For other issues related to it you can refer to site : www.listenmefirst.com
Nothing earth shattering that I’ve seen. Some things are of modest interest to me, for example, the new WiFi direct printing, so I won’t have to mess around with different drivers. Remote data wipe that allows you to remotely wipe business data on employees personal machines is a nice built-in feature too. Most of the changes are like that in my opinion, in that they can be useful, but none are really ground breaking. Still, a decent upgrade.