Check below URL,s for Lync server & client updates,
http://technet.microsoft.com/en-us/lync/gg131945
http://technet.microsoft.com/en-us/lync/gg131945
Lync 2010 Client
- Cumulative Updates for Lync 2010 - July 2011
- Lync Server 2010
- Cumulative Updates for Lync Server 2010 - July 2011
- Lync Server 2010, Group Chat
Lync 2010 Phone Edition- Cumulative Updates for Lync 2010 Phone Edition (for Aastra 6721ip and Aastra 6725ip) - July 2011
- Cumulative Updates for Lync 2010 Phone Edition (for Polycom CX500, Polycom CX600, and Polycom CX3000) - July 2011
- Cumulative Updates for Lync 2010 Phone Edition (for Polycom CX700 and LG-Nortel IP Phone 8540) - July 2011