title: Hide/show add-in depending on the subject(or something else) of the message(Office 365 Outlook add-in)
body: <p>I want to show add-in only for certain messages in office365 in outlook. For example, I received a message with the subject &quot;invoice&quot; and the add-in should be visible, but if the subject does not contain this word &quot;invoice&quot; in the subject, then the add-in shouldn't be visible. Is it possible?</p>
  <p><a href="https://i.stack.imgur.com/4vHc1.png" rel="nofollow noreferrer">My custom add-in</a></p>