title: Why does Internet Explorer (9) report "Mozilla" in UserAgent?
body: <p>Why does Internet Explorer has <code>Mozilla</code> in UserAgent?</p>
  
  <p>In Firefox it's stating:</p>
  
  <blockquote>
    <p>Mozilla/5.0 (Windows NT 6.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1</p>
  </blockquote>
  
  <p>In Interner Explorer it's stating:</p>
  
  <blockquote>
    <p>Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; Tablet PC 2.0; .NET4.0E; .NET4.0C)</p>
  </blockquote>
  
  <p>In some blogs/forums it's mentioned, that it is due to some historical reasons, but what's the reason?</p>
  
  <p>It would be very helpful to know about it.</p>