This poster shows each workload in Microsoft Lync Server 2010 communications software, describing relationships, dependencies, flow of information, and certificate requirements. Version 5.10 incorporates Mobility Services and corrections in the IM and Presence workload.
Get it from here: http://www.microsoft.com/download/en/details.aspx?id=6797
Cheers,
Anderson Patricio
http://blogs.msexchange.org/patricio
Twitter: @apatricio