Step-by-step guide
Open Other Mailbox
If you are not already signed in, you will be redirected to the Microsoft Sign In page. Enter your MBU credentials to login.

You will now see the Outlook Web Application. Click on your name in the upper right hand corner, and select "Open another mailbox..."

Type in the name of the shared mailbox you would like to access. Select it from the drop down and click "Open"
A new browser tab will open OWA for the shared mailbox.
Add Shared Folder to My Mailbox
If you are not already signed in, you will be redirected to the Microsoft Sign In page. Enter your MBU credentials to login.

You will now see the Outlook Web Application. Right-click on the "Folders" menu in the list on the left side of your screen. Select "Add shared folder."

Type in the name of the shared mailbox you would like to access. Select it from the options shown and click "Add."

You should see the shared mailbox in your list of mailbox options on the left side of the application shortly thereafter.

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