title: Change free windows phone app to paid one
body: <p>I have an application in the windows phone marketplace which is ad supported (free to download) and requires an internet connection to work (to download some data from a web service).</p>
  
  <p>Now that web service allows me to download that data as a XML and use it. Hence I would now like to release a paid version of that app which is without ads and works offline. Can I just release an update to my existing app and add all the new features and make it paid and under the trial section put the old ad supported one?</p>
  
  <p>Also will my current users be able to update to the new one (i.e. the one without ads) without having to paid. (Because initially they downloaded the free one, i.e app purchased for $0).</p>