Enabling IM and presence integration in Outlook Web App
The process of enabling IM and presence in Outlook Web App has a few twists and turns, depending on what your Exchange configuration looks like. If your Exchange servers combine the CAS and Mailbox roles, setup is simplified because you don’t need to set up trusted application pools in Lync. If you have single-purpose CAS or Mailbox servers, you need to perform the steps listed in the Configuring IM/P with single-role servers section first.
The overall architecture of IM/P integration in Outlook Web App 2013 is very similar to that of its predecessor; an application runs on the Exchange server and uses the Lync APIs to retrieve contacts and their presence status, start and answer IM conversations, ...
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