title: Installing Add-in In Exchange Server 2016 CU 12
body: <p>I have one extension which is working perfectly fine in office365 outlook but when I am trying to install the outlook client exchange server I am getting the following issue.</p>
  <blockquote>
  <p>This add-in has been disabled to keep you safe. To continue using the add-in validate that this item is hosted in a trusted domain or open it in the Office desktop app.</p>
  </blockquote>
  <p>There is a 'continue' button however clicking simply shows 'sorry we can't continue</p>
  <p><a href="https://i.stack.imgur.com/fckwk.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fckwk.jpg" alt="Here's the issue when I click the icon" /></a></p>
  <p>I tried using different edge, chrome, and ie explorer but did not work out. Also, try by disabling all security features of the exchange server. I am using windows server 2016 with ES 2016 and CU 12 on windows server 2016.</p>
  <blockquote>
  <p>Name                : EC2AMAZ-0OQ14RF
  Edition             : StandardEvaluation
  AdminDisplayVersion : Version 15.1 (Build 1713.5)</p>
  </blockquote>