Exchange 2007 and event id 4011

This is a simple environment. Single DC (W2003) with a single MS Exchange 2007 (W2003) server.

On various occassions I notice in the app log and error that references event id 4011 (Source = MSExchange Availability). The supporting details of the event references a domain that is not part of our system and states....

Process 7436[w3wp.exe:/LM/W3SVC/1/ROOT/EWS-1-129129871989577068]: Configuration for forest NOTMYDOMAIN.COM was not found in Active Directory. Run the Add-AvailabilityAddressSpace command in the Exchange Management Shell for an Exchange Server 2003 Active Directory forest.

I don't understand why I would need to run something in my AD for a domain that is not part of our environment. On the other hand I am concerned if I do not do anything there is a bigger problem at hand.

Any suggestions as to what this is really about and what (if anything) I should do?
Who is Participating?
Syed Mutahir AliConnect With a Mentor Technology ConsultantCommented:
Based on my research, this 4011 event can be safely ignored. This event is
constantly logged in the application log when Exchange 2007 mailbox is try
to view availability information for an external contact in which there is
no direct forest relationship.  domain is external domain
where you have corresponding contact in your forest, which is not directly
related to these external domains. When an Exchange 2007 mailbox is trying
to view these external contact's availability information, 4011 would not
logged. There will be no user
impact when you see this event and we can ignore it.

For Diagnostics :
Satya PathakLead Technical ConsultantCommented:
Run the this command on the server that is running Microsoft Exchange Server and that logged this event using the Exchange Management Shell:

Add-AvailabilityAddressSpace -ForestName <name of the remote Active Directory Forest> -AccessMethod PublicFolder

Note   This command is valid if the remote Active Directory forest is an Exchange Server 2003 forest.

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