If you have access to more than one mailbox you can add the additional one(s) directly into Outlook.


You can add the Mailbox(es) to both the Outlook desktop app or the Office 365 online version, but the methods are different. 


There are instructions for both methods below


Add the shared mailbox to desktop 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@contoso.com.
  8. Choose OK > OK .
  9. Choose Next > Finish > Close .



How to add shared mailbox in Outlook Online

  1. Right click on "Folders" in the left navigation pane, and then choose Add shared folder or mailbox.

  2. In the Add shared folder dialog box, type the Shared mailbox name or email address and click Add .