"Hi there. I'm Cortana. I can help make life a bit easier for you." These are the first words of Microsoft's still unannounced virtual assistant codenamed "Cortana," according to a new video leaked by UnleashThePhones.com. If it's true, this is the best look we've had of the rumored Windows Phone 8.1 service so far. The video begins by showing Cortana as a dedicated Live Tile, and then takes us through the setup process. You'll be prompted to login with your Microsoft Account, which is required to enjoy all of the service's features; according to the permissions page, Cortana will have access to sources like your location data, voice input, contacts, calendar, search history, emails and texts, browser history and more.