Event ID 4011 is logged when you query free/busy data for external contacts in Exchange Server 2007

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Symptoms

When you query free/busy data for external contacts in Microsoft Exchange Server 2007, the following event is logged consistently in the Application log:

Event Type: Error
Event Source: MSExchange Availability
Event Category: Availability Service 
Event ID: 4011
Description:
Process <ID>[w3wp.exe:/LM/W3SVC/1/ROOT/EWS-<ID>]: Configuration for forest <external domain name> was not found in Active Directory. Run the Add-AvailabilityAddressSpace command in the Exchange Management Shell for an Exchange Server 2003 Active Directory forest.

Note: This Event 4011 may cause confusing to the Exchange administrators because it is a normal situation that the Free/Busy data of external contacts is not available

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Cause

This issue occurs because of a logic error in Exchange Server 2007. Specifically, Exchange Server 2007 tries to locate free/busy data for external contacts. When the free/busy data is unavailable, Exchange Server 2007 still logs an event. However, you do not expect Exchange Server 2007 to log an event when free/busy data for external contacts is unavailable.

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