Applies ToOutlook for Microsoft 365 Outlook on the web New Outlook for Windows
  1. In classic Outlook, select File > InfoAccount Settings > Account Settings.

  2. On the Email tab, choose your email account and select Change.

  3. Select More Settings > Advanced > Add. Enter the email address of the shared mailbox and select OK and OK again.

  4. Select Next > Done > Close.

For more info, see Open and use a shared mailbox in Outlook.

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