title: Is it possible to write an outlook add-in that modifies the color of the user interface?
body: <p>I'd like to write an outlook add-in that changes the color of the Outlook window when the user opens an e-mail that comes from a sender external to the company.</p>
  
  <p>Can someone tell how to change the color of the outlook window? Also, will I need to use MAPI?</p>