How to Add a Shared Mailbox in Outlook for Mac (Step by Step)

AvatarByEric Dawson Computers & Software

To add a shared mailbox in Outlook for Mac, first get access granted by your Microsoft 365 administrator, then open Tools, select Accounts, and choose Delegation and Sharing to add the mailbox by its email address. Outlook for Mac supports Full Access permissions only, so once your administrator grants that access, the shared mailbox appears in your account list within a few minutes.

Microsoft has split the process into two paths depending on which Outlook for Mac you run. Current Outlook for Microsoft 365 uses the Delegation and Sharing screen, while Legacy Outlook for Mac still relies on the older Advanced Delegates tab, and each path adds the mailbox in a slightly different way.

What You Need Before Adding a Shared Mailbox in Outlook for Mac

You need administrator-granted access before Outlook for Mac will let you open a shared mailbox at all. A Microsoft 365 administrator or email administrator has to assign you permission on the mailbox first, because Outlook for Mac cannot request that access on its own. That applies whether you run Outlook for Microsoft 365 for Mac, Outlook 2024 for Mac, or Outlook 2021 for Mac, and it requires a Microsoft Exchange Server account behind the scenes rather than a personal IMAP or POP inbox.

Full Access is the only permission type Outlook for Mac reliably supports for a shared mailbox, though other permission levels occasionally work depending on how the administrator configured them. At many organizations the access request goes through a help desk or ticketing system, and approval has to finish before the mailbox shows up, no matter which method below you use to add it.

Different guides use different names for the same screen. Microsoft’s own support documentation calls the current version Outlook for Microsoft 365 for Mac, while some third-party guides call it New Outlook and describe right-clicking the primary mailbox instead of opening the Accounts window directly. Both describe the same underlying process, but Microsoft’s documentation is the more authoritative source for exact version names and supported builds, so this guide follows Microsoft’s terminology throughout.

How to Add a Shared Mailbox in New Outlook for Mac

Current Outlook for Mac adds a shared mailbox through the Delegation and Sharing screen or the File menu, and either path takes well under a minute once access has been granted.

Using Delegation and Sharing

The Delegation and Sharing screen is the standard route for Outlook for Microsoft 365 for Mac, Outlook 2024 for Mac, and Outlook 2021 for Mac. Follow these steps in order.

  1. Open Accounts: Click Tools in the menu bar, then choose Accounts.
  2. Select Delegation and Sharing: In the Accounts window, click Delegation and Sharing.
  3. Open Shared With Me: Select the Shared With Me tab.
  4. Add the mailbox: Click the plus button, then search for the shared mailbox by its email address.
  5. Confirm and close: Click Add, then click Done and close the Accounts window.

Once you finish those steps, the shared mailbox appears automatically in your Outlook navigation pane alongside your own folders. No restart is required in most cases, though a busy mailbox can take a moment to populate.

Opening a Shared Mailbox from the File Menu

File, then Open, then Shared Mailbox gives the same result in fewer clicks when you already know the address you need. Click File in the menu bar, choose Open, select Shared Mailbox, type the email address, and click Add.

How to Add a Shared Mailbox in Legacy Outlook for Mac

Legacy Outlook for Mac uses an older Advanced Delegates tab instead of the Delegation and Sharing screen, though it lands in the same place. Start at Tools, then Accounts, then choose your Exchange account from the list on the left.

  1. Open Delegation and Sharing: With the Exchange account selected, click Delegation and Sharing.
  2. Go to Shared With Me: Click the Shared With Me tab, then click the plus icon.
  3. Enter the address: Type the shared mailbox’s email address into the search field.
  4. Select and confirm: Choose the mailbox from the search results and confirm the addition.

Using the Delegates Tab Under Advanced Settings

Some older Legacy Outlook builds hide shared mailbox setup inside Advanced settings rather than a dedicated sharing tab. From the Accounts window, click Advanced in the bottom right corner, open the Delegates tab, click the plus sign below “Open These Additional Mailboxes,” and search for the mailbox you want to add.

How to Add a Shared Mailbox as a Full Access Account

Adding the shared mailbox as its own Full Access account is the method to pick when you want it to sync in the background automatically, rather than depending on the delegation screen. It behaves like a second email account inside Outlook.

  1. Open Accounts: Go to Tools, then Accounts.
  2. Add an account: Click the plus sign to add an additional Exchange account.
  3. Enter the mailbox address: Type the shared mailbox’s email address in the account field.
  4. Use your own login: Under Authentication, provide your own credentials, never the shared mailbox’s password.
  5. Turn on syncing: Enable “Sync shared mailbox” so Outlook updates it without you clicking Send and Receive.

That “Sync shared mailbox” setting was added in Outlook for Mac version 16.13.411, so anyone on an older build needs to update first. Check your version from the Outlook menu, then About Outlook, and compare the build number against 16.13.411 before assuming the option is missing rather than just hidden behind an outdated install.

A Worked Example: Adding a Support Mailbox

Here is how the process looks in practice. Suppose your administrator grants you Full Access to a mailbox named support@yourcompany.com. You open Tools, then Accounts, click the plus sign, and type support@yourcompany.com into the new account field. Under Authentication you enter your own Microsoft 365 email address and password, not any password tied to the support mailbox itself, then you check the box for Sync shared mailbox before clicking Add. Outlook confirms the account, the support mailbox appears as a separate entry in your account list on the left, and its messages start arriving without you touching Send and Receive.

Credential guidance varies slightly by source too. Microsoft’s instructions call for your own sign-in, not the shared mailbox’s password, and GCIT’s guidance agrees but adds that sending as the shared mailbox may need separate permission. Thompson Rivers University notes that when a shared mailbox has no password of its own, you sign in with your own institutional account instead, and you only use the mailbox’s own password when one has actually been set for it.

Comparing the Four Methods for Adding a Shared Mailbox

Four supported methods exist, and the right one depends on whether you need full send-as access or just a quick look at shared folders. The table below lines them up side by side.

Method Outlook Version Steps When to Use
Delegation and Sharing New Outlook (Microsoft 365) Tools, Accounts, Delegation and Sharing, Shared With Me, plus button Delegate access or several shared folders
File, Open, Shared Mailbox New Outlook (Microsoft 365) File, Open, Shared Mailbox, search and add Quick access to a mailbox you already use
Full Access account New Outlook (Microsoft 365) Tools, Accounts, plus sign, enter mailbox email, enter your credentials Full access with automatic sync
Delegates tab Legacy Outlook for Mac Tools, Accounts, Advanced, Delegates tab, plus sign Anyone still running Legacy Outlook

Pick Delegation and Sharing for a quick add when someone shares one or two folders with you. Reach for a Full Access account instead when you rely on the mailbox daily and want it to update itself, and fall back to the Delegates tab only if your Outlook build is still the Legacy version.

If I were responsible for a shared mailbox that needed regular attention, I would choose the Full Access account method and turn on Sync shared mailbox. The extra setup is worthwhile because automatic syncing removes the need to rely on manual Send and Receive checks. For a mailbox I only needed to open occasionally, I would use File, Open, Shared Mailbox instead, since it reaches the same mailbox with fewer steps. In either case, I would wait for confirmed Full Access before troubleshooting Outlook.

Why a Shared Mailbox Might Not Appear and How to Fix It

A shared mailbox that does not show up right away is usually still loading rather than broken, so patience and a restart solve most cases. Large mailboxes can take several minutes to populate the first time Outlook connects to them, and the permission itself can take a little while to finish propagating after an administrator grants it.

  1. Wait it out: Give a large mailbox several minutes before assuming something failed.
  2. Restart Outlook: Close Outlook completely and reopen it, which resolves the issue in many cases.
  3. Force a sync: Choose Send and Receive from the toolbar, or click the sync icon on the ribbon.
  4. Check permissions: Ask the mailbox owner or your administrator to confirm your permission is actually active.

If the Mailbox Still Does Not Appear

Confirm with your administrator that the permission was granted on the correct mailbox and account, since a typo in the address is a common cause. If permissions check out and several minutes have passed, quit Outlook, reopen it, and force another Send and Receive before contacting support, since synchronization after adding a shared mailbox can take multiple minutes on its own. Double-check the exact spelling of the shared mailbox address as well, since a near-miss address can return no results without any obvious error message.

What Outlook for Mac Cannot Do with Shared Mailboxes

Outlook for Mac lets you open a shared mailbox’s folders, but it cannot change who has permission to those folders from inside the Mac app. Permission changes have to happen elsewhere.

To share your own folders with someone else from a Mac, you need Outlook 2021 for Mac specifically, or you need to set permissions through the web interface at outlook.office.com. Auto-mapping is not supported either, so a shared mailbox never appears automatically just because an administrator granted permission; you still have to add it yourself using one of the methods above.

Sharing Calendars and People Folders the Same Way

Yes, the same Delegation and Sharing screen and File menu that add a shared mailbox also open a shared calendar or People folder, since Microsoft documents all three under one setup process. Outlook does not put calendars and contacts behind a separate menu.

When you search for the shared resource by its email address, Outlook treats a calendar or contacts folder the same way it treats a mailbox, so the steps above apply without changes. If a shared calendar does not appear after you add it, the same fixes work: wait a few minutes, restart Outlook, and confirm the owner’s permission with your administrator.

Frequently Asked Questions

Can I Add a Shared Mailbox Without Administrator Access?

No. A Microsoft 365 administrator or email administrator must grant you permission on the shared mailbox before Outlook for Mac will let you add it. Trying to add it beforehand just returns an error or an empty result when you search for the address.

How Long Does It Take for a Shared Mailbox to Appear?

Most shared mailboxes show up within a few minutes of being added, but a large mailbox can take longer on its first sync. If nothing appears after several minutes, restart Outlook and force a Send and Receive before troubleshooting further.

Does Outlook for Mac Automatically Show Shared Mailboxes?

No. Outlook for Mac does not support auto-mapping, so a shared mailbox will not appear just because an administrator granted you permission. You always have to add it yourself through Delegation and Sharing, the File menu, or a Full Access account.

Can I Send Email from a Shared Mailbox in Outlook for Mac?

Sending as a shared mailbox generally needs extra permission beyond the access used to open it, and the exact steps depend on how your administrator configured send-as rights. Check with your administrator about send-as permission if the option is not available once the mailbox is open.

How Do I Remove a Shared Mailbox from Outlook for Mac?

Removing a shared mailbox works from the same Accounts window used to add it: open Tools, then Accounts, select the shared mailbox entry, and remove it from either the Delegation and Sharing list or the account list, depending on how you originally added it. This only removes it from your Outlook view; it does not change the underlying permission.

What Should I Do if My Shared Mailbox Access Is Denied?

Access that gets denied usually means the permission was never granted or has not finished propagating yet on the server. Ask the mailbox owner or your administrator to confirm the permission is active, and check that you are searching by the exact email address rather than a display name. Give it a few more minutes once the administrator confirms the permission is correct, since propagation can lag behind the actual grant.

Getting a shared mailbox working in Outlook for Mac comes down to two things: administrator-granted permission and the right menu path for your Outlook version. Once both are in place, Full Access with sync turns on automatic updates, and even a slow first load usually resolves within a few minutes of patience.

What This Page Does Not Publish

  • I cover adding a shared mailbox, not the steps for sending mail from it.
  • I do not walk through permission errors or access-request delays.
  • I leave out removing mailboxes and opening shared calendars or people folders.

References

Author Profile

Eric Dawson
Eric Dawson
I'm Eric Dawson, the writer behind The Money Watch. I live in the Columbus, Ohio area and I write about the ordinary questions that turn out to be complicated: computers, shopping, food, travel, parking, small businesses, fees, rules and products. Every article starts with the official page, the maker or the agency, then the sources that check it, and I say plainly where they disagree and what I would do. More about how I work is on the About page.