Symptoms

Consider the following scenario:

  • You deploy more than one front-end pool, such as pool A and pool B, in a Microsoft Lync Server 2013 environment.

  • You deploy Microsoft Exchange Server 2010.

  • You integrate Lync Server 2013 instant messaging with Exchange Server 2010 Outlook Web App (OWA).

  • You associate Exchange Server 2010 with pool A.

  • A user (user A) is homed in pool A, and another user (user B) is homed in pool B.

  • User A and user B sign in to OWA separately.

In this scenario, user A cannot see the presence status of user B. Additionally, user B cannot send instant messages to user A.

Cause

This issue occurs because Lync Server 2013 determines that pool A is not trusted, and that makes Lync Server 2013 refuse to route theĀ ACK response message.

Resolution

To resolve this issue, install the following cumulative update:

3001616 October 2014 Cumulative Update 5.0.8308.831 for Lync Server 2013 (Front End Server and Edge Server)

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