How To: | Access a Shared Mailbox in Outlook on the Web
To add the shared mailbox to the online version of Outlook:
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Sign in to your Office 365 account and select the Outlook app.
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In the navigation pane, right-click on your mailbox name or Folder and select Add shared folder.
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In the Add shared folder dialog box, type the email address of the shared mailbox and then select Add.