To be able to answer this question, we can use a simple cmdlet: Get-CsServerVersion

1. When run it will attempt to
2. Read the registry value HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Real-Time Communications\{A593FD00-64F1-4288-A6F4-E699ED9DCA35}\Type
3. Based on that registry value, the cmdlet will then report back the version number of the software and the Lync Server licensing information the local computer and report back one of the following:
   • That the Lync Server volume license key has been installed on the computer, meaning that no updating is necessary.
   • That the Lync Server evaluation license key has been installed, meaning that the computer must be updated.
   • That no volume license key is required on the computer. Updating from the evaluation version to the licensed version is only required on Front End Servers, Directors, and Edge Servers.

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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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

It’s here! Get your Lync Server 2010 Resource Kit, your one-stop-shop, under-the-hood, technical reference for Lync Server 2010. The Lync Server Resource Kit is the result of a humungous cross-team effort that brought together the deep knowledge of over 100 Lync Experts from inside and outside Microsoft.

The chapter downloads are available here

In addition the resource kit tools are here

Direct download links: