There are two ways to open a shared mailbox using Outlook Web App. You may want to try both methods and see what works best for you.

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

We recommend that you use this method if you want to monitor the email from your primary mailbox and the shared mailbox at the same time. In addition, after you complete this task, each time you open Outlook Web App, the shared mailbox and its folders will display in the left navigation in Outlook Web App.

  1. Sign in to your account in Outlook Web App.
  2. Right-click your primary mailbox in the Folder pane, and then click Add shared folder. (If you can't see see your primary mailbox click on the "more" link at the bottom of the list.)
  3. In the Add shared folder dialog box, type the name of the shared mailbox, select the name, and then click Add.

The shared mailbox displays in your Folder list in Outlook Web App. The shared mailbox will appear there each time you access Outlook Web App. You can expand or collapse the shared mailbox folders like you can your with your primary mailbox. You can also choose to remove the shared mailbox from your folder list if you no longer want to view the shared mailbox in your folder list. To remove it, right click the shared mailbox, and then click Delete.

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 a its own browser window.

  1. Sign in to your account in Outlook Web App.
  2. In the Navigation bar on the top of the Outlook Web App screen, click on your name. A drop-down list will appear.
  3. Click Open another mailbox.
  4. Type the email address of the other mailbox that you want to open. Another Outlook Web App session will open in a different window allowing access to the other mailbox.
 Tip    If you mistype the email address of the mailbox, a second window will open up stating that the webpage can’t be found. Try retyping the email address again.

If you use the desktop application Outlook, instructions can be found here:


To manually add the shared mailbox to Outlook:        
  1. Open Outlook.
  2. Choose the File tab in the ribbon.
  3. Choose Account Settings, then select Account Settings from the menu.
  4. Select the Email tab.
  5. Make sure the correct account is highlighted, then choose Change.

  6. Choose More Settings > Advanced > Add.

  7. Type the shared email address, such as info@goodwill-ni.org.
  8. Choose OK > OK.
  9. Choose Next > Finish > Close.
https://support.microsoft.com/en-us/office/open-and-use-a-shared-mailbox-in-outlook-d94a8e9e-21f1-4240-808b-de9c9c088afd