This document introduces you to some of the new client features that are available whenever Microsoft Lync Server 2010 communications software is integrated with Microsoft Exchange Server 2010.
Download it from here: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=e28a196a-b80f-4c7e-952c-9dceacae1beb&displaylang=en
Cheers,
Anderson Patricio
http://blogs.msexchange.org/patricio
Twitter: @apatricio