Microsoft release December 8, 2015, update for Lync 2013 (Skype for Business) (KB3039776)

This security update contains the following improvements:

  • Adds Cloud-based Discovery
  • Uses SSO to autodetect SIP address and start sign in


  • When you are in a public switched telephone network (PSTN) call, and you open a Conversation Window Extension (CWE), the call option controls are covered by the CWE without any way to access the controls without closing the CWE.
  • Lync client doesn’t show all the fonts if the computer has more than 1,000 fonts.


This update version is 15.0.4779.1000.

After you apply this update, Microsoft Lync 2013 will be upgraded to Skype for Business. Get the general information about the new experience in Skype for Business.