CallPilot uses IMAP, so you could add an IMAP account to your Outlook to monitor another mailbox.
Go to Tools-->E-mail accounts-->Add a new e-mail account
Select IMAP. In the settings window, you need to fill out the User Information, Server Information, and Logon Information.
User Information
Your Name: <anything you want>
E-Mail Address: <a valid e-mail address>
Server Information
Incoming Mail Server (IMAP): <CallPilot IP, or Hostname>
Outgoing mail server (SMTP): <your Exchange server>
Logon Information
User Name: <mailbox number>
Password: <mailbox password>
check Remember Password
This will add another message store with the CallPilot IP address or Hostname - whichever you used for 'Incoming Mail Server'.