This Wiki page lists the Exchange Server versions and Update Rollups with release dates and KB respectively.

http://social.technet.microsoft.com/wiki/contents/articles/exchange-server-and-update-rollups-builds-numbers.aspx

July 2011 Cumulative Update (CU3) includes updates for client, server and core components

Lync Client KB and download

Lync 2010 Hotfix KB 2571543 (32 bit and 64 bit)

Server / Core Components KB and download

Lync Server 2010 Hotfix KB 2493736

Cumulative update for Lync Server 2010, Core Components: July 2011

Cumulative update for Lync Server 2010: July 2011

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It now supports Exchange 2003 in 2010 and 2007 environments; and it also makes it easier to send mail and schedule the report generation.

New Features and Changes:

• Now supports Exchange 2003 in addition to 2007 and 2010 (should support 2000 too, but not robustly tested)
• New options to send mail with report as attachment directly from the script
• New option to schedule itself to run nightly
• Shows Log and Database disk free (including DBs on mount points)
• Shows Rollup Update version as well as number
• Major code re-factor and re-write. Down from 62KB to 33KB, only 100 lines longer even with the extra features and code should be more readable (functions at the top, main code from line 669 onwards)
• Altered the method of data collection to avoid repetition. Most data retrieved up-front in one go then processed
• Improved warnings and troubleshooting information on non-fatal errors (such as if it can’t get information from a server via WMI)

Lync Microsoft Documentation
http://technet.microsoft.com/en-us/library/gg398616.aspx

Lync Downloads
http://technet.microsoft.com/en-us/lync/gg236589.aspx

Lync Resource Kit
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=80cc5ce7-970d-4fd2-8731-d5d7d0829266&displaylang=en

Lync RCC Configuration Guide
http://technet.microsoft.com/en-us/library/gg398621.aspx