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 the external URL for Exchange Web Services is not configured in the target forest.
Configure the external URL for Exchange Web Services for the target forest. To do this, run the following command in Windows PowerShell for Exchange:
Note In this command, contoso represents the actual domain name.
Set-WebServicesVirtualDirectory -identity "server_name\EWS (Default Web Site)" -ExternalURL https://mail.contoso.com/ews/Exchange.asmx
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 21, 2015 - Revision: 5.0