Assume that you send an instant message to a Microsoft Lync for Mac 2011 user to start a conversation. The user does not click Accept to receive the message. In this situation, the message is not stored in conversation history in Lync for Mac 2011.
To resolve this issue, install the following cumulative update:
2909662 Description of the Microsoft Lync for Mac 2011 14.0.7 update
Article ID: 2913463 - Last Review: Dec 12, 2013 - Revision: 1