Symptoms

Consider the following scenario between two on-premises Microsoft Exchange Server 2010 organizations (organization A, and organization B):

  • You set up federated delegation, or federated sharing between organization A and organization B.

  • You set up Threat Management Gateway, or set up a device that is capable to SSL offloading in front of organization A.

In this scenario, you cannot look up the free/busy information of a user who is located on organization A from organization B. Therefore, the following scenarios are affected:

  • Sharing free/busy information between two organizations that cannot setup AD trust.

  • Sharing a person-to-person calendar over the federated delegation.

  • Office 365 coexistence scenarios that depend on federated delegation to provide a cross-premises experience.

  • A live@edu user who uses federated delegation to share free/busy information between on-premises servers and datacenters.

Resolution

To resolve this issue, install the following update rollup:

2579150 Description of Update Rollup 4 for Exchange Server 2010 Service Pack 1

Workaround

To work around this issue, disable SSL offloading on Threat Management Gateway or on the device that is capable to SSL offloading.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about federation, visit the following Microsoft website:

General information about federationFor more information about federated delegation, visit the following Microsoft website:

General information about federated delegationFor more information about federated sharing, visit the following Microsoft website:

General information about federated sharing

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