You cannot look up the free/busy information of a user who is located on an Exchange Server 2010 organization from another Exchange Server 2010 organization

Article ID: 2533538 - View products that this article applies to.
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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.
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RESOLUTION

To resolve this issue, install the following update rollup:
2579150
(http://support.microsoft.com/kb/2579150/ )
Description of Update Rollup 4 for Exchange Server 2010 Service Pack 1
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WORKAROUND

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

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

For more information about federation, visit the following Microsoft website:
General information about federation
(http://technet.microsoft.com/en-us/library/dd335047.aspx)
For more information about federated delegation, visit the following Microsoft website:
General information about federated delegation
(http://technet.microsoft.com/en-us/library/dd638083.aspx)
For more information about federated sharing, visit the following Microsoft website:
General information about federated sharing
(http://technet.microsoft.com/en-us/library/dd638083(EXCHG.140).aspx)
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Properties

Article ID: 2533538 - Last Review: July 28, 2011 - Revision: 3.0
APPLIES TO
  • Microsoft Exchange Server 2010 Service Pack 1, when used with:
    • Microsoft Exchange Server 2010 Enterprise
    • Microsoft Exchange Server 2010 Standard
Keywords: 
kbqfe kbexpertiseinter kbfix kbhotfixrollup kbsurveynew KB2533538
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