title: Windows phone OS 7.0 vs OS 7.1
body: <p>I am creating a new WP7 application on visual studio and the first thing it asks me to do is to target a WP OS version.</p>
  
  <p>I have 2 options , 7.0 and 7.1  .</p>
  
  <p>I am trying to make a simple app , implementing push notifications. I see on the tutorial from microsoft that is for OS 8.0 and 7.1 . What does that mean? That it wont run in OS 7.0 if i choose 7.1?</p>
  
  <p>IF i develop it for 7.0 will it work at all and if yes will it run on 7.1 ?</p>