title: Windows Phone Device Unique Id
body: <p>I have a windows phone 7 app which is live in store which is using <code>DeviceExtendedProperties.GetValue("DeviceUniqueId")</code> to fetch id and I am updating it in store with new windows phone 8 app and using same method. </p>
  
  <p>In both cases I am getting different id? I want the id to be same in both the cases.</p>