title: Add a custom button to an existing ribbon in Outlook 2010 and 2013
body: <p>I want to customise the ribbon that is displayed when the "Home" tab is clicked in OUtlook 2010 and 2013.</p>
  
  <p>Questions -</p>
  
  <ol>
  <li>Is this possible? Or do I have to create a custom ribbon and cannot modify the existing ribbon?</li>
  <li>If the existing ribbon can be modified, please can you'll direct me to links that can provide this information.</li>
  </ol>
  
  <p>I absolutely have no clue where to start from with this. Any links, docs or samples will be helpful.
  I've been going through msdn but it all speaks of custom ribbon and that doesn't fit my purpose. I need to modify the existing ribbon.</p>