This issue occurs when you only uninstall the cumulative update 6.0.9319.55 (KB3061059) for Microsoft Skype for Business Server 2015 Front End servers and Edge servers. Or, it occurs when you uninstall the cumulative update 6.0.9319.55 for Microsoft Skype for Business Server 2015 Front End servers and Edge servers before you uninstall the cumulative update 6.0.9319.55 (KB3051958) for Microsoft Skype for Business Server 2015 core components in at least one of the following server roles:
When this issue occurs, you receive the following events:
- Skype for Business Server 2015 - Standard Edition Server
- Skype for Business Server 2015 - Enterprise Edition Server (Front End server and Back End server)
- Skype for Business Server 2015 - Edge server
When this issue occurs, you receive the following events:
Lync Server Event Logs
Application Event Logs
System Event Logs