Cortana
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Cortana for Windows Phone 8.1 inspires envy in Siri and Google Now
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Take a spin through the setup of Cortana: Windows Phone 8.1's answer to Siri and Google Now (Video)
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Cortana for Windows Phone 8.1 will call you "Master Chief"
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Siri, meet Cortana...now girls, don't fight
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Here's everything we know about the Window Phone 8.1 update
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Siri, say hello to Cortana
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