The free/busy information does not display of a remote user whose mailbox is located on an Exchange Server 2003 server

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Article ID: 2506820 - View products that this article applies to.
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Consider the following scenario:
  • You configure a federation trust between two organizations by using Microsoft Federation Gateway.
  • The first organization is a mixed Exchange Server 2003 and Exchange Server 2010 environment.
  • The second organization is an Exchange Server 2010 only environment.
  • A user in the second organization looks up the free/busy information of an Exchange Server 2003 mailbox user in the first organization.
In this scenario, hash marks are displayed instead of the Free/Busy information.


When Exchange 2010 in the remote organization detects an autodiscover query being performed for a legacy Exchange 2003 mailbox, Exchange 2010 will fail the lookup because Exchange 2003 does not support Autodiscover.


To resolve this issue, install the following update rollup:
2579150 Description of Update Rollup 4 for Exchange Server 2010 Service Pack 1


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


A separate issue with Exchange 2003 Cross-Org lookups has been identified due to MergedOnly Free/Busy information being returned. For more information , click the following article number to view the article in the Microsoft Knowledge Base:
2567863 Free/Busy information may not be returned when a Cross-Org query is performed from a legacy Exchange user


Article ID: 2506820 - Last Review: July 28, 2011 - Revision: 9.0
  • Microsoft Exchange Server 2010 Service Pack 1, when used with:
    • Microsoft Exchange Server 2010 Standard
    • Microsoft Exchange Server 2010 Enterprise
kbqfe kbfix kbsurveynew kbexpertiseinter kbhotfixrollup KB2506820

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