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There's a link somebody posted below about how it works: http://blogs.msdn.com/b/ie/archive/2011/05/17/smartscreen-17...

It's a reputation system for downloads. Sure its something a antimalware can do as well but given that most software/malware gets downloaded these days, makes sense to have something like this in browser

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I agree the browser should be involved in some way. But wouldn't it be better to have a single antivirus that integrates with your browser, email client, and also scans USB drives you connect? Browsers aren't the only vector of attack, so duplicating an antivirus seems an odd choice.

From the article, it sounds like the main benefit of SmartScreen is the quickness. But again, wouldn't it be better to have an antivirus with that performance, and then your entire system would benefit..?

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