title: Office.context.mailbox.item.body is not defined
body: <p>I am developing Office Addin for outlook, I struct with the following, please kindly help.</p>
  
  <p><code>Office.context.mailbox.item.body.getAsync()</code> method is working fine in Office 365 , but when it comes to on premise exchange server 2013, it works in outlook client but not works in outlook web app. Minimum mailbox requirement set version is 1.3</p>
  
  <p><a href="https://i.stack.imgur.com/sn2Vx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/sn2Vx.png" alt="issue"></a></p>