Security Update for Microsoft Lync 2010 (64 -bit) (KB4025865)
If you are starting a new setup, it is important to know the software's history and its modern replacements: lync 2010 download 64 bit
The June 2016 update for Lync 2010 64-bit (KB3171499) is also available for maintaining existing installations. Security Update for Microsoft Lync 2010 (64 -bit)