Outlook app:

1. Open the outlook app
2. Select File
3. Account settings > Account settings
Select Change
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4. More Settings
5. Advanced
Select Add
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6. Type in the shared mailbox address > press Ok
7. Select Next > Finish CloseCheck the side panel you will see the new shared mailbox underneath your main email

1. Open outlook in web browsing app
2. Right click on the folders tab
3. Select Add shared folder or mailbox
4. Type in the mailbox > select add