Im thrilled for you all to now meet our truly personal digital assistant for Windows Phone, says Joe Belfiore as he introduces the Bing-powered Cortana voice assistant. Belfiore is demonstrating all the new features in Windows Phone 8.1 at Microsofts Build conference at the moment, with Cortana being the major highlight. Cortana is very much Microsofts answer to Apples Siri, Samsungs S Voice, and all the other voice assists software suites out there. Similar to Google Now, Cortana learns from the web searches you perform and the locations you frequent to try and provide contextually sensitive and timely information.