Use this dialog box to associate access nodes with an Exchange Mailbox client.
Exclude
A list of the available access nodes (clients). You can select one or more clients from this list and move them to the Include list.
Access nodes in the Exclude list are not associated with the Exchange Mailbox client.
Include
A list of access nodes that are associated with the Exchange Mailbox client. You must associate at least one access node with the Exchange Mailbox client.