Here’s a quick guide borrowed from groovypost which explains how to set up an additional mailbox in Outlook 2007. Enjoy!
With Outlook 2007 open, ClickTools, Account Settings
ClickAdvanced Tab then ClickAdd
Type in name of additional / secondary mailbox and ClickOK
Note: You must have at least READ access to new mailbox otherwise after adding, you will not be able to open new mailbox. If you need help with this, ask your systems administrator or post your question in my Forum.
Verify new Mailbox is listed under “Open these additional mailboxes“ Click OK
That’s it! Very simple!
Here’s what your Outlook Client will look like once your new Mailbox is added: