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Cortana is a personal assistant created by Microsoft for Windows Phone, and recently brought to Windows 10. It was first released in a Beta of Windows Phone 8. Much like other phone assistants, Cortana speaks to the user, and can accept voice input. It uses Bing search to respond to queries, and uses a repository within the phone called Cortana's Notebook, where Cortana keeps notes about the user so it can provide better, more personalized results later.
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