You cannot sign in Skype for Business 2015 (Lync 2013) if there are cache loading issues

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Skype for Business 2015 Microsoft Lync 2013 More...Less

Symptoms

Assume that you complete the registration with the serversuccessfully . If there are issues in loading the cache pool, and the cache pool cannot be loaded completely, you get stuck in signing in Microsoft Skype for Business 2015 (Lync 2013).

Resolution

To fix this issue, install the December 6, 2016, update (KB3127976) for Skype for Business 2015 (Lync 2013).

Note Lync 2013 was upgraded to Skype for Business in April 2015.