Exchange2007:RemoteDomain and OOF (Out-of-Office)

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For most, we must understand "An Out-of-Office message is set on the clients (Outlook and OWA) but is sent by Exchange server."

How many types of clients do we have?
Outlook 2007
Outlook 2003 or earlier
OWA 2007
OWA 2003 or earlier

In Exchange Management Console, the remote domain property has the following settings:

1. Allow none ----I know it means no OOF sends to remote domain.
2. Allow external out-of-office messages only ----???
3. All external out-of-office messages and out-of-office messages set by Outlook 2003 or earlier clients or sent by Exchange server 2003 or earlier servers ----???
4. Allow internal out-of-messages, and out-of-office messages set by outlook 2003 or earlier clients or sent by Exchange server 2003 or earlier servers ----???
   

First, Outlook 2007 and OWA 2007 clients can be configured as for internal users with internal OOF messages and for external users with external OOF messages.

"Allow external out-of-office messages only" allows the external OOF messages from Outlook 2007 and OWA 2007.

"All external out-of-office messages and out-of-office messages set by Outlook 2003 or earlier clients or sent by Exchange server 2003 or earlier servers" allows the external OOF messages from Outlook 2007 and OWA 2007, and OOF messages from Outlook 2003 and OWA 2003 or earlier. Outlook 2003 and OWA 2003 don't have the external OOF and internal OOF feature.

"Allow internal out-of-messages, and out-of-office messages set by outlook 2003 or earlier clients or sent by Exchange server 2003 or earlier servers" allows the internal OOF messages from Outlook 2007 and OWA 2007, and OOF messages from Outlook 2003 and OWA 2003 or earlier.

The following cmdlet controls the individual mailbox can only send internal OOF messages.

SET-MAILBOX -IDENTITY 'Kevin.Smith' -ExternalOofOptions InternalOnly