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Assume that you install the Lync Server 2013 (July 2013) cumulative updates on the Persistent Chat front-end and back-end servers. If you then uninstall the Lync Server 2013 (July 2013) cumulative updates on the Persistent Chat front-end server, the Persistent Chat service or Persistent Chat Compliance service does not start. Additionally, the following event is logged in the Lync Server event logs:

Additionally, the following exception is included with the event:

Microsoft.Rtc.Internal.Chat.Server.ServerCommon.Exceptions.StopServerException: Unexpected DB version.
at Microsoft.Rtc.Internal.Chat.Server.ServerCommon.TransportServerBase.Initialize()
at Microsoft.Rtc.Internal.Chat.Server.Channel.Server.ChannelServer.Initialize()
at Microsoft.Rtc.Internal.Chat.Server.ServerCommon.MgcServiceBase.startServer()
at Microsoft.Rtc.Internal.Chat.Server.ServerCommon.MgcServiceBase.createAndStartServer()


To resolve this problem, install the cumulative update that is described in the following article in the Microsoft Knowledge Base:

2835433 Description of the cumulative update 5.0.8308.420 for Lync Server 2013, Persistent Chat: July 2013

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