I came across several link to download Lync Server 2010, but all the link took me to this location:
I thought of uploading and creating a download for Lync Server 2010. If you want to download Lync Server 2010 you can download from my below link.
Download Lync Server 2010
Note: It’s .ISO file, you will have to extract it to installer file after download using WinISO, Ultra ISO or other tools.
June, 8, 2014 Update: I found the Microsoft site from where you can download lots of Previous Version software’s including Lync, Exchange, Windows and SQL Servers.