Being two releases behind, Lync 2010 doesn’t get much of a look-in around here these days, but I shouldn’t neglect referencing the latest Security Update:
Kb3075593: MS15-080: Description of the security update for Lync 2010: August 11, 2015 “This security update resolves vulnerabilities in Microsoft Lync 2010. These vulnerabilities could allow remote code execution if a user opens a specially crafted document or goes to an untrusted webpage that contains embedded TrueType or OpenType fonts. To learn more about the vulnerability, see Microsoft Security Bulletin MS15-080”.
This update takes the Lync 2010 client to 4.0.7577.4476.
This is the client fix itself:
This is the updated version of the Lync 2010 Attendee software: