title: display:none doesn't work on Outlook 2007
body: <p>I want to send an e-mail from our system to customers, where some tags should be hidden to them. I've set the following CSS:</p>
  
  <pre><code>.hidden { display: none; }
  </code></pre>
  
  <p>But this does not work. What solutions or alternatives are there for hiding elements in an e-mail?</p>