title: Outlook web add-in Inactive buttons in downloaded .ics appointment
body: <p>Colleagues, maybe anyone knows why web add-in buttons are disabled on downloaded .ics appointment on ribbon, and maybe anyone knows the solution to grand access to downloaded appointment in outlook via web add-in, or it’s just a feature those we should accept?
  <a href="https://i.stack.imgur.com/6umGL.png" rel="nofollow noreferrer">example screenshot</a>
  Maybe I can add some xml tag, to solve it...
  My google research doesn’t gave any results</p>
  
  <p>If I’ll save appointment, it’s work, but there is not a solution</p>
  
  <p>Only one tag with permission in my manifest.xml that I have now is:</p>
  
  <pre class="lang-xml prettyprint-override"><code>    &lt;Permissions&gt;ReadWriteMailbox&lt;/Permissions&gt;
  </code></pre>
  
  <p>I expect that add-in should work with external .ics appointments</p>
  
  <p>Thank you in advance!</p>