April 2014 Cumulative updates for Lync server 2010.
Recently I have installed April 2014 CU on my Lync server 2010 environment.
After updating Lync server patches Lync server 2010 version got changed to Lync server core component, Lync Server and web component version: 4.0.7577.230.
You can download the MS CU from below URL:
Note: Make sure to update Lync Backend server after updating Lync Server Front End server.
Always stop Lync services on all Front End server before updating SQL DB.
After updating Lync patches it will look like below: