How To: | Access a Shared Mailbox in Outlook on the Web

To add the shared mailbox to the online version of Outlook:

  1. Sign in to your Office 365 account and select the Outlook app.
  2. In the navigation pane, right-click on your mailbox name or Folder and select Add shared folder
  3. In the Add shared folder dialog box, type the email address of the shared mailbox and then select Add.