Microsoft is currently preparing to deploy an updated version of the Outlook Web App. You can use the new version of OWA by selecting "Try the new Outlook" in the top right of your screen. The new Outlook has a different way of adding shared mailboxes than the classic version does.
|title||Classic Outlook Web App|
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.
If you attempt to open a mailbox you do not have permission to access, you will recieve a 500 error like the one below.