title: Real time messaging and Internet Explorer
body: <p>We are currently working on an app that uses pusher.com to maintain a list of available people on our chat application.</p>
  
  <p>Unfortunately, some of our users have IE &lt; 10 (ie no websockets) and don't have flash, so pusher.com will not work. Also, pusher is becoming more and more expensive for our usage (pusher is more for few connections with lot of data going through and we're doing the opposite!)</p>
  
  <p>So I'm looking for an alternative to pusher (either hosted or self-hosted) that will work on IE7+ with or without flash.</p>
  
  <p>So far, here is what I'm considering:</p>
  
  <ul>
  <li>XMPP/BOSH</li>
  <li>socket.io (self-hosted)</li>
  <li>pubnub</li>
  </ul>
  
  <p>As for the scale, we will probably have to handle 100+ messages per second and 10000 concurrent users. Nobody here has ever played with socket.io (or bosh), and we do not wish to have too much maintenance work (ie deal with many servers and such). So 2 or 3 self-hosted servers is ok, 10+ isn't.</p>
  
  <p>Any thoughts?</p>