Symptoms
When you have upcoming meetings to join, you may find the meetings keep disappearing from the Meetings tab in Microsoft Installer (.msi)-based editions of Skype for Business 2016 and Skype for Business 2015 (Lync 2013).
Resolution
To fix this issue, install one of the following updates:
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For Skype for Business 2016, install the March 6, 2018, update (KB4011725).
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For Skype for Business 2015 (Lync 2013), install the March 6, 2018, update (KB4018290).
Note Lync 2013 was upgraded to Skype for Business in April 2015.