Here you go, all about Microsoft Lync Server 2010 from technet site
Microsoft Lync Server 2010 communications software offers instant messaging (IM), presence, conferencing, and telephony solutions that can support enterprise-level collaboration requirements.
The following tables list the topics in the Lync Server 2010 documentation library. This documentation is also available for download. To download a document from the Microsoft Download Center, click the link next to Download now in the column on the right. You can also download a local compiled help file of all technical content, from the Microsoft Download Center at http://go.microsoft.com/fwlink/?LinkId=205577.
Also the Workload Poster http://blogs.technet.com/b/drrez/p/lync_2010_workloads.aspx
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