How to: Add a shared Mailbox in New Outlook or Outlook on the Web

Shared mailboxes will no longer automatically appear in New Outlook and must be added manually.

Before You Start

You must already have permission (Full Access) to the shared mailbox.
You will need the email address of the shared mailbox you want to add.

Steps

Open new Outlook
Look at the left folder pane
Right-click on Folders
Select Add Shared Folder
Enter the email address of the shared mailbox and press enter
Scroll below your mailbox list
The newly added shared mailbox appears with its name