If you have been granted access to mailboxes besides your own, this how-to explains how to add the mailbox to Outlook. This will let you navigate its folders, send, and receive emails from that mailbox.
In Outlook, click File, at the top left of your window. Then Click Account Settings Account Name and Sync Settings.
Click More Settings.
Click the Advanced tab and then Add… button.
Enter the name of the mailbox you’d like to add. In the example below, we’re adding SH-MB-Accounts Payable. Then click OK.
Once you go back to your mailbox view, you’ll see the newly added mailbox below your own. It may take some time to populate the mailbox, so you may not see all its contents right away.
Please note: You must be explicitly granted access to a mailbox to see its contents. While you may add any mailbox, it won’t open unless you have access.