May 20 2019 07:13 AM - edited May 20 2019 07:22 AM
The update KB4464547 causes Skype for Business to crash.
Uninstalling the update, reverts Skype back to working order.
The comment here seems to indicate there's a fault in mshtml.dll
Jun 21 2019 07:57 AM
@oiverson https://support.microsoft.com/en-us/help/4464593 resolves this issue.