title: If a user has bought my app and I make it a paid app later, do they get updates for free?
body: <p>I've created a Windows Phone app.</p>
  
  <p>It was originally free, however, I then made it a paid for application.</p>
  
  <p>Will the people who downloaded it when it was free receive the new updates for free or will they be forced to buy it?</p>
  
  <p>Thanks for the help; I'm not sure if this is the right section by the way.</p>