Symptoms
Assume that you remote the desktop to a computer that's running Microsoft Skype for Business 2015 (Lync 2013), and then you share your screen. In this situation, the Pin/Unpin button at the top of the screen fails to work even though you have enabled it.
Resolution
To fix this issue, install the February 7, 2017, update (KB3161988) for Skype for Business.Note Lync 2013 was upgraded to Skype for Business in April 2015.
