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Launch the Outlook application on your computer. Ensure you are logged in with your account that has access to the shared mailbox.
Click on **File** in the top left corner, then select **Account Settings** and choose **Account Settings** again from the dropdown.
In the Account Settings window, select your email account from the list and click on **Change**.
In the Change Account window, click on **More Settings**. Then navigate to the **Advanced** tab.
Under the **Mailboxes** section, click on **Add**. Enter the name or email address of the shared mailbox, then click **OK**. Finally, click **Next** and then **Finish**.