How to Add a Shared Mailbox on Microsoft 365 in Outlook for Mac

How to Add a Shared Mailbox on Microsoft 365 in Outlook for Mac

A shared mailbox allows multiple users to access and manage a common email account for customer enquiries, team communication, or shared internal tasks. If you need to add a shared mailbox in Outlook for Mac, this guide will show you how to set it up, troubleshoot common issues, and start using it successfully.

Shared Mailbox Setup Instructions

Step 1: Open Outlook for Mac

Launch Outlook for Mac and sign in using your Microsoft 365 work or school account.

Step 2: Open Settings

From the top menu bar, click Outlook > Settings. If you are using an older version of Outlook, this may appear as Preferences.

Open Settings

Step 3: Select Accounts

In the Settings window, click Accounts to view your connected email accounts.

Select Accounts

Step 4: Choose Your Main Microsoft 365 Account

Select the Microsoft 365 account that has permission to access the shared mailbox.

Step 5: Add the Shared Mailbox

Depending on your Outlook version, look for one of the following options:

  • Delegation and Sharing
  • Shared With Me
  • Open Shared Mailbox
  • Add Shared Mailbox

Click Add or the + button.

Add the Shared Mailbox

Step 6: Enter the Mailbox Address

Type the shared mailbox email address (for example: support@company.com) and confirm.

Step 7: Wait for Syncing

Allow Outlook a few moments to sync. Once complete, the shared mailbox should appear in the left-hand folder list.

Wait for Syncing

Step 8: Start Using the Mailbox

You can now use the shared mailbox to:

  • Read emails
  • Manage folders
  • View shared calendars
  • Send emails (if permitted)
Start Using the Mailbox

Fix Shared Mailbox Setup Issues

Beginner Troubleshooting

Shared Mailbox Not Showing

  • Restart Outlook for Mac.
  • Wait a few minutes for syncing to complete.
  • Confirm your internet connection is stable.

Permission Error

  • Confirm access has been granted.
  • Ask your Microsoft 365 administrator to verify permissions.

Cannot Send Emails

  • Open a new email.
  • Change the From field to the shared mailbox address.
  • Confirm you have Send As or Send on Behalf permission.

Advanced Troubleshooting

Update Outlook

Go to Help > Check for Updates and install the latest version.

Remove and Re-add Your Account

Remove your Microsoft 365 account from Outlook, then add it again to refresh mailbox settings.

Test in Outlook on the Web

Sign in through Outlook on the web. If the shared mailbox works there, the issue may be specific to the Mac app.

IT Administrator Checks

  • Verify permissions in Microsoft 365 Admin Center.
  • Check mailbox settings in Exchange Admin Center.
  • Confirm automapping is enabled.
  • Review licensing and account status.

Important Shared Mailbox Notes

  • You must be granted access before the shared mailbox can be added.
  • Permission changes may take time to sync across Microsoft 365 services.
  • Menu names may vary depending on your Outlook version.
  • Do not remove your main email account unless you know your login details.
  • Always follow your company’s security and privacy policies when using shared mailboxes.

Shared Mailbox FAQs

Why can’t I see the shared mailbox?
It may still be syncing, Outlook may need to restart, or your permissions may not be active yet.
Do I need a separate password for the shared mailbox?
No. Shared mailboxes normally use your existing Microsoft 365 account permissions.
Can multiple users access the shared mailbox?
Yes. Multiple authorised users can access it at the same time.
Can I send emails from the shared mailbox?
Yes, if you have the correct send permissions.
What if I use an older version of Outlook for Mac?
Some menu names and steps may look different. Updating Outlook is recommended.
Can I use the shared mailbox without the Outlook app?
Yes. You can access it through Outlook on the web.

Your Shared Mailbox Is Ready

Adding a shared mailbox in Outlook for Mac makes it easier for teams to manage shared communication efficiently. Once permissions are correctly assigned, setup usually takes only a few minutes. If you still experience issues adding or accessing the mailbox, please contact Swazzy Support for further assistance.

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