This is only worth doing if you have too many users to manually update via the GUI.
Based on the defined e-mail addresses, every affected object gets this E-Mail address.
The Default installation creates two default policies: It is not possible to deactivate the default X400 address type because it is possible that some old components like custom applications etc. It is possible to create the following proxy addresses: When you create a new address type or modify an existing one every new and existing object gets the new address type or address changes.
Note: It is not possible to move Mailboxes between different administrative Groups in Exchange Mixed mode – except Exchange 5.5 Mailboxes when Exchange 2003 SP1 is installed and you must use the Exchange Server Site Consolidation tools.
For more information about the Site Consolidation tools, read the following article: successful User Account and Mailbox creation, you will notice that the new account has no e-mail address and no Exchange information appears in the dialog box. There is a process called Recipient Update Service which is responsible for updating the Exchange information in Active Directory.
Start Exchange System Manager and navigate to Mailbox Store.
Note: If you can’t see the administrative and Routing Groups you have to enable the view. You can see the Mailbox in ESM after the first successful Mailbox Login with the associated user or when this account has received its first e-mail.
You can create an Exchange Mailbox with the Active Directory Users and Computers Snap In.
The process is similar for creating a normal Active Directory User Account with some additional steps.
In exchange 2003, I updated the default recipient policy to include 2 new e-mail domains, applied the policy, did 'update now' in recipient update service.