title: Migration Windows Store App based on 8.1. does it has backward compatibility with 8?
body: <p>As you know Microsoft Build conference is running on this week.</p>
  
  <p>I hardly find whether 8.1 based store app has backward compatibility with 8 based app or not.</p>
  
  <p>If I upgrade my Store App (<strong>what if I make update on preview period</strong>) to 8.1 based template, does it run on Windows 8 without problem?
  Or, do I need to treat some special cases? I already know that Snapped ViewState was removed.</p>
  
  <p>If there's no problem, please link relative article on answer. I could not find it.</p>