Symptoms
After you enable the EnableDelayPostingOfDeferredCOMEvents option for Microsoft Skype for Business 2016, you notice that the process handle count for Lync.exe increases until the client crashes.
Cause
A thread handle is not correctly closed when it is finished. This causes a handle leak.
Resolution
To fix this issue, install the July 7, 2020, update (KB4484326) for Microsoft Skype for Business 2016.
More information
For more information, see Skype for Business client stops responding when receiving a toast notification of an IM or an incoming call in Citrix VDI environment.
