Symptoms
You may encounter the following issues in Microsoft Lync 2010 or Lync 2013 in a Lync Server 2013 environment.
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You cannot send an instant message. Additionally, you receive the following error message:
This message may not have been delivered to xxx because there was no response from the server.
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You cannot change your presence status.
Cause
These issues occur because the RtcHost.exe process that is running on the Lync Server 2013 front-end server is restarted unexpectedly. This is caused by an issue in the IIMFilter component.
Resolution
To resolve this issue, install the following cumulative update:
2987510 September 2014 Cumulative Update 5.0.8308.815 for Lync Server 2013 (Front End Server and Edge Server)
