Important update available for Exchange Server 2013 hybrid deployments

An important is now available to resolve customers are currently experiencing when using the Configuration Wizard (HCW) to create a new or manage an existing hybrid with .

If you currently have an 2013-based hybrid deployment configured, you will not notice any issues unless you rerun the HCW as part of updating or managing your existing hybrid features. Unless you need to reconfigure your hybrid deployment, you can simply wait for the next update of Exchange 2013 () to correct this with the HCW.

For organizations creating new or managing an existing hybrid configuration with the HCW, the following HCW error message indicates you are experiencing the issue this update addresses:

Subtask CheckPrereqs execution failed: Check Tenant Prerequisites 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

If you experience this issue, contact Microsoft support to obtain the fix as documented in KB2988229. This fix requires Exchange Server 2013 Service Pack 1 (SP1) or Cumulative Update 5 (CU5).

Once the Interim Update (IU) is applied, customers can successfully run the HCW and complete configuring a hybrid deployment with .

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