Hello We are running Exchange 2007/2010 in a resource forest mode. Exchange forest: exchange.contoso.com AD forest: AD.directory.com We have decided to start using Room Mailboxes to book rooms etc and move away from our existing booking system. I did have some questions though on how this works in a Resource Forest environment. Let's say I want to create a Room Mailbox named Meeting1. Users need to email Meeting1@contoso.com to book this room. Question 1: Do we just need a disabled account in Contoso that is mail enabled? 2: Out of interest, can a linked mailbox be a Room Mailbox too?

1: Do we just need a disabled account in Contoso that is mail enabled? You need a mailbox with disabled accounty in Exchange org. A linked mailbox is a mailbox that is associated with an external account. The resource forest scenario is an example of when you would want to associate a mailbox with an external account. In a resource forest scenario, user objects in the Exchange forest have mailboxes, but the user objects are disabled for logon. You must associate these disabled user accounts in the Exchange forest with enabled user objects in the external accounts forest. Ref: http://technet.microsoft.com/en-us/library/bb123524(v=exchg.80).aspx 2: Out of interest, can a linked mailbox be a Room Mailbox too? http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/0d4993db-d695-489e-b9f1-de4fbf86664b/

1: Do we just need a disabled account in Contoso that is mail enabled? You need a mailbox with disabled accounty in Exchange org. A linked mailbox is a mailbox that is associated with an external account. The resource forest scenario is an example of when you would want to associate a mailbox with an external account. In a resource forest scenario, user objects in the Exchange forest have mailboxes, but the user objects are disabled for logon. You must associate these disabled user accounts in the Exchange forest with enabled user objects in the external accounts forest. Ref: http://technet.microsoft.com/en-us/library/bb123524(v=exchg.80).aspx 2: Out of interest, can a linked mailbox be a Room Mailbox too? http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/0d4993db-d695-489e-b9f1-de4fbf86664b/

1. Yes. http://technet.microsoft.com/en-us/library/bb123524.aspx 2. Not. http://technet.microsoft.com/en-us/library/bb201680.aspx Fiona Liao TechNet Community Support