Adding a shared mailbox to Outlook for the Mac - Instructions for M365 Shared Mailboxes.

1. In Outlook, click the "Tools" tab near the top of the window, click the "Accounts"  menu item.

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2. Click on the “Advanced“ button

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3. Choose the “Delegates” tab as below:

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4. Under the “Open these additional mailboxes” Click the “+” to get the following dialog window

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5. Enter the account name in the search field, then select it in the list below, as below:
   
   

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6. Click add and you will see the following:
   
   

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7. Click the “OK” button, and close the dialog windows.

    

1. Open Outlook for the Mac

2. Ensure you are running Outlook using the New Outlook. Toggle the option to ON:

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3. With New Outlook enabled:

   1. In the Tools menu, choose Accounts, and select the account that has access to the mailbox.

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   2. Select Delegation and Sharing

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   3. Choose Shared With Me tab

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      d. Choose + to add a shared or delegated mailbox, confirm with the Add button

4. Your shared mailbox will now be available to use in Outlook for the Mac

Please see the article Outlook for Mac - Microsoft Support to learn of the many new features. Note that not all features are available yet in the New Outlook for Mac.

Support for Legacy Outlook for Mac will end in October 2025

You may prefer to continue using the Old Outlook for Mac window design and toolbar ribbon.