Article ID: 2545080 - Last Review: January 25, 2012 - Revision: 1.0

Users in a source forest cannot view the free/busy information of mailboxes in a target forest when the cross-forest Availability service is configured between two Exchange Server 2007 forests

View products that this article applies to.
System TipThis article applies to a different operating system than the one you are using. Article content that may not be relevant to you is disabled.
Expand all | Collapse all

SYMPTOMS

Assume that you configure the cross-forest Availability service between two forests that have Microsoft Exchange Server 2007 installed. In this situation, users who use Microsoft Office Outlook or Outlook Web Access (OWA) in the source forest cannot view the free/busy information of the mailboxes in the target forest.
Back to the top

CAUSE

This issue occurs because the Client Access server in the source forest uses internal URLs of the Availability service in the target forest. When a user requests free/busy information, the Client Access server in the source forest uses the Autodiscover service to determine which URL of the Availability service in the target forest to query free/busy information. The Autodiscover  service retrieves both the external URLs and the internal URLs that are configured for Exchange Web Services in the target forest. However, the source Client Access server only uses the internal URLs of the Availability service. Because the internal URLs of the target forest cannot be resolved by DNS, the request fails.
Back to the top

RESOLUTION

To resolve this issue, install the following update rollup:
2608656  (http://support.microsoft.com/kb/2608656/ ) Description of Update Rollup 6 for Exchange Server 2007 Service Pack 3

Back to the top

STATUS

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

MORE INFORMATION

For more information about how to configure the Availability service for cross-forest topologies, visit the following Microsoft website:
General information about how to configure the Availability service for cross-forest topologies (http://technet.microsoft.com/en-us/library/bb125182(EXCHG.80).aspx)
For more information about the cross-forest Availability service, visit the following Microsoft website:
General information about the cross-forest Availability service for Exchange Server 2003 and Exchange Server 2007 (http://support.microsoft.com/kb/2455134)
For more information about the Autodiscover service in Exchange Server 2007, visit the following Microsoft website:
General information about the Autodiscover service in Exchange Server 2007 (http://technet.microsoft.com/en-us/library/bb332063(EXCHG.80).aspx)

Back to the top
APPLIES TO
  • Microsoft Exchange Server 2007 Service Pack 3, when used with:
    • Microsoft Exchange Server 2007 Enterprise Edition
    • Microsoft Exchange Server 2007 Standard Edition
Back to the top
Keywords: 
kbqfe kbfix kbsurveynew kbexpertiseinter KB2545080
Back to the top