title: Using Windows Live ID authentication in a Windows Phone 8 app
body: <p>I am trying to write a Windows Phone 8 app which needs to save some information about the user in the cloud, to be able to identify him/her in future.  For the cloud database, I am using Azure Mobile Service.  But, I am not sure what information to use as the unique userid.  Either I can come up with something of my own, or I can use some existing identity services.</p>
  
  <p>Knowing that Windows Live ID (now known as Microsoft Account) is so integrated with Windows Phone workflows, I thought I can use that but doesn't seem like there is an easy way of doing that?</p>
  
  <p>Does anyone know how my app can make use of Windows Live ID information that the user is already using to login to the Phone?</p>
  
  <p>I want to make the process as seamless as possible for the app-user which is why I want to avoid getting the user to sign-up for my custom identification mechanism.</p>