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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.
Consider the following scenario between two on-premises Microsoft Exchange Server 2010 organizations (organization A, and organization B):
To resolve this issue, install the following update rollup:
(http://support.microsoft.com/kb/2579150/ )Description of Update Rollup 4 for Exchange Server 2010 Service Pack 1
To work around this issue, disable SSL offloading on Threat Management Gateway or on the device that is capable to SSL offloading.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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
Article ID: 2533538 - Last Review: July 28, 2011 - Revision: 3.0