On the Network (Site) Mailbox page for the mailbox, make the appropriate changes:
In the Last Name and First Name boxes change the name of the remote user. The name can be a maximum of 16 characters.
Select the Display in Directory check box if you want the name of the mailbox to appear in the Company Directory, or clear the check box if you do not want the mailbox to be listed.
In the Site Prefix box change the site prefix.
In the Remote Mailbox box change the number of the remote mailbox.
After you make the changes, click the Submit button.