Article ID: 2734791 - View products that this article applies to.
Cross-forest or hybrid free/busy information lookups fail in Microsoft Exchange Server. However, standard free/busy information lookups for users in the same forest work as expected.
This issue occurs in the following product versions:
This issue occurs if Outlook Anywhere is not enabled or the External URL for Exchange Web Services is not configured in the target forest.
To work around this issue, enable Outlook Anywhere in the target forest, and then verify that the external URL for Exchange Server Web Services is configured correctly. To do this, follow these steps.
Note The client access servers in the source forest must be able to connect to the external URL for Exchange Web Services.
The versions of Exchange Server that are listed in the "Symptoms" section use the external URL for Exchange Web Services to connect to the target forest. Because the AutoDiscover service cannot return the external URL for Exchange Web Services if Outlook Anywhere is not enabled in the target forest, the cross-forest or hybrid lookup fails.
To verify that the mailbox is set to allow connections by using Outlook Anywhere, run the following cmdlet:
If this cmdlet returns a value of "$False," the mailbox is set to allow connections by using Outlook Anywhere.
Get-CASMailbox user |fl MapiBlockOutlookRpcHttp
For more information about the Set-WebServicesVirtualDirectory cmdlet, go to the following Microsoft TechNet website:
Article ID: 2734791 - Last Review: July 15, 2014 - Revision: 4.0
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