Method 1: Add the shared mailbox so it displays under your primary mailbox in Outlook Web App 

This method is recommended if you want to monitor email from both your primary and shared mailboxes at the same time. With this method, the shared mailbox and its folders are displayed in the left navigation pane each time you open Outlook Web App. 

1. Go to https://portal.office.com

2. Sign into your account in the Outlook Web App

3. Right-click 'Folders' in the left navigation pane

4. Choose 'add shared folder' 

5. Type the name or email address of the shared mailbox, and then click add

The shared mailbox displays in your Folder list in Outlook Web App. You can expand or collapse the shared mailbox folders as you can with your primary mailbox. You also can remove the shared mailbox from your Folder list. To remove it, right-click the shared mailbox, and then click delete. 

Method 2: Open the shared mailbox in a separate browser window 

We recommend that you use this method if you want to view and manage the email for the shared mailbox in its own browser window. 

1. Go to https://portal.office.com

2. Sign into your account in Outlook Web App

3. Click on your profile in the upper left-hand corner of the Outlook app

4. Click 'Open another mailbox' 

5. Type the name or email address of the shared mailbox, and then click add. Another Outlook Web App session opens in a separate window allowing access to the other mailbox.