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Event ID: 4011 Source: MSExchangeAvailability

Process <process>: Configuration for forest <forest> was not found in Active Directory. Run the Add-AvailabilityAddressSpace command in the Exchange Management Shell for an Exchange Server 2003 Active Directory forest.
ME972514 says that this event may be recorded when you query free/busy data for external contacts in Microsoft Exchange Server 2007. It is caused by a bug and you can install Update Rollup 1 for Exchange Server 2007 Service Pack 2 to fix it.
This error can occur if a user adds an Exchange contact that sits in a remote not-directly connected domain/forest, to a meeting request. Exchange 2007 will try to get the availability of this contact, which is not possible in this case.
See MSEX2K3DB and TB218577 for information on this issue.

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