Deserialization fails due to one SerializationException:
Microsoft.Exchange.Compliance.Serialization.Formatters.BlockedTypeException: The type to be (de)serialized is not allowed: Microsoft.Exchange.Data.Directory.DirectoryBackendType
When you upgrade from Microsoft Exchange Server 2010 to Exchange Server 2013If you upgraded from Exchange Server 2010 to Exchange Server 2013 and are experiencing the issue that's described in the "Symptoms" section, we recommend that you install the latest cumulative update for Exchange Server 2013. For more information, go to Updates for Exchange 2013.
Article ID: 2988229 - Last Review: 26 Apr 2016 - Revision: 1