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Users in a source forest cannot view the free/busy information of mailboxes in a target forest in an Exchange Server 2010 environment

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Symptoms

Assume that you configure the cross-forest Availability service between two forests that have Microsoft Exchange Server 2010 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.

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Cause

This issue occurs because the Client Access server in the source forest uses the 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.

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Resolution

To resolve this issue, install the following update rollup:
2645995 Description of Update Rollup 1 for Exchange Server 2010 Service Pack 2

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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 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
For more information about the Autodiscover service, visit the following Microsoft website:
General information about the Autodiscover service
For more information about a similar issue, click the following article number to view the article in the Microsoft Knowledge Base:
2545080 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

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Keywords: kbqfe, kbfix, kbsurveynew, kbexpertiseinter, kb

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Article Info
Article ID : 2545231
Revision : 1
Created on : 1/7/2017
Published on : 2/13/2012
Exists online : False
Views : 337