title: IE9 jQuery AJAX with CORS returns "Access is denied"
body: <p>The following works in all browsers <strong>except IE</strong> (I'm testing in IE 9).</p>
  
  <pre><code>jQuery.support.cors = true;
  ...
          $.ajax(
              url + "messages/postMessageReadByPersonEmail",
              {
                  crossDomain: true,
                  data: {
                      messageId       : messageId,
                      personEmail     : personEmail
                  },
                  success: function() {
                      alert('marked as read');
                  },
                  error: function(a,b,c) {
                      alert('failed');
                  },
                  type: 'post'
              }
          );
  </code></pre>
  
  <p>I have another function which uses <code>dataType: 'jsonp'</code>, but I don't need any data returned on this AJAX call. My last resort will be to return some jibberish wrapped in JSONP just to make it work.</p>
  
  <p>Any ideas why IE is screwing up with a CORS request that returns no data?</p>