How to Add a Shared Mailbox to Outlook on Any Device

To add a shared mailbox to Outlook, first ask your Microsoft 365 or Exchange administrator to give your account access, then add the mailbox in Outlook if it does not appear automatically. The steps depend on whether you use classic Outlook for Windows, new Outlook, Outlook on the web, or Outlook for Mac. Once connected, you can read messages and, if separately authorized, send from the shared address.

A shared mailbox is a common inbox such as support@company.com that multiple people use. It is different from a Microsoft 365 Group mailbox, which includes group conversations and related collaboration features. If your organization calls a Microsoft 365 Group a shared group mailbox, see the distinction in the tips below before following these steps.

What You’ll Need

The shared mailbox’s full email address, such as support@company.com.
Permission to access it. An administrator or mailbox owner usually grants you Full Access, and may separately grant Send As or Send on Behalf permission.
A work or school Microsoft 365 or Exchange account already set up in Outlook. You generally cannot add an organization’s shared mailbox using a personal Outlook.com account.
An internet connection. Allow time for new permissions to take effect; they may not work immediately after being granted.

Ask your IT team to confirm which permissions you need. Full Access lets you open and manage mailbox contents, but it does not automatically authorize you to send messages as that address.

Step-by-Step

Confirm that you have access. Contact the mailbox owner or your IT administrator and provide the exact shared address. Ask them to grant Full Access if you need to read and organize messages. If you also need to reply as the shared address, request Send As or Send on Behalf permission as appropriate. Wait for confirmation before troubleshooting Outlook; adding an address yourself does not grant access.
Check whether Outlook added it automatically. Close and reopen Outlook, then look in the folder pane for the shared mailbox name or address beneath your work account. Some Exchange and Microsoft 365 setups automatically map mailboxes for users with Full Access. If it is already listed, expand it and open Inbox. You do not need to add a second copy.
Add it in new Outlook for Windows. Open new Outlook and find your account or the Folders area in the left folder pane. Right-click the account name and choose Add shared folder or mailbox. Depending on the current layout, you can also open Settings > Accounts > Shared with me and choose the option to add a shared folder or mailbox. Enter the shared mailbox’s email address, select the matching result, and confirm. Expand the mailbox in the folder pane to view its folders.
Add it in classic Outlook for Windows. Open classic Outlook, then go to File > Account Settings > Account Settings. On the Email tab, select your Microsoft 365 or Exchange account and choose Change. Select More Settings, open the Advanced tab, and choose Add under Open these additional mailboxes. Type the shared mailbox name or email address, select it if Outlook finds a match, and choose OK. Choose Apply and OK to close the remaining dialogs, then restart Outlook if the mailbox does not appear right away. Button labels can vary slightly by Outlook build.
Add it in Outlook on the web. Sign in to your organization’s Outlook on the web account. In the left folder pane, right-click Folders or your mailbox name and choose Add shared folder or mailbox. Enter the shared address, select the correct match, and choose Add. If the folder pane is collapsed, expand it first. The mailbox should then appear in the pane; select its arrow to open Inbox and other folders.
Add it in Outlook for Mac. In Outlook, open Tools > Accounts, select your work or school Exchange account, and open Delegation and Sharing. Select Shared With Me, choose the plus button, and enter the mailbox address. Select the matching mailbox and add it. In some versions, account settings are under Outlook > Settings rather than Tools. If your version does not show the shared-mailbox controls, update Outlook or ask your administrator which Mac setup method your organization supports.
Use it in Outlook for iOS or Android, if needed. Tap your profile icon or account menu, then choose the option to add an account. Select Add a Shared Mailbox if it appears, choose the work account that has permission, and enter the shared address. Mobile menu labels can vary by app version. If the option is unavailable, update Outlook or use Outlook on the web or desktop to confirm access first.
Test reading and sending separately. Open the shared Inbox and check that messages load. To send from it, start a new message and look for the From field. If it is hidden, use the message’s options to show it; the exact command varies by Outlook version. Select the shared address as the sender and send a brief test to an appropriate colleague. If Outlook rejects the sender or sends from your personal address, your sending permission or From selection may need attention.

Common Mistakes

Trying to add the mailbox before permission is granted. Typing an address into Outlook is not a substitute for administrator access. Ask for the correct permission first.
Assuming Full Access includes sending rights. It normally allows access to mailbox contents, but Send As or Send on Behalf may need to be granted separately.
Adding the mailbox twice. Automatic mapping may already have put it in the folder pane. Look beneath your account before using a manual add option.
Confusing a shared mailbox with a Microsoft 365 Group. A Group has a group conversation and collaboration tools, and may appear under Groups rather than as another mailbox. Ask your administrator which one the address belongs to.
Entering a display name that matches several accounts. Use the full email address and confirm the selected result is the right mailbox.

Tips

Keep the mailbox easy to spot. Expand it in the folder pane and consider pinning or favoriting its Inbox if your Outlook version offers that option. Avoid moving shared messages into your personal folders unless your team’s process calls for it.
Know which identity you are using. When replying, check the From address before sending. A message displayed in the shared Inbox can still be sent from your personal account if the From field is not set correctly.
Agree on team practices. Shared access means colleagues may see changes such as read status, moved messages, or deleted items. Coordinate who handles messages and how to mark them so two people do not unknowingly work on the same request.
Use the right setup for a Microsoft 365 Group. If IT confirms it is a Group, find or join it through the Groups area in Outlook rather than adding it as a shared mailbox. Group features and availability depend on your organization’s configuration.
Remember that Outlook versions differ. New Outlook and classic Outlook for Windows have different settings. On a Mac, menu names can vary by release, so use the version-specific path rather than searching for a Windows-only Advanced tab.

Troubleshooting

The mailbox does not appear. Confirm that your administrator granted access to the exact mailbox and to the account you are currently signed in with. Restart Outlook, then check the folder pane again. In classic Outlook, automatic mapping can take time; try the manual Advanced tab method only if your organization permits it. In new Outlook or the web, repeat the add step and check that you selected the correct result.

Outlook says the mailbox cannot be found or opened. Check for a spelling error and use the full email address. Verify that the mailbox still exists and that your access has finished propagating. Sign out and back in, or test in Outlook on the web. If web access also fails, send IT the exact error message, the mailbox address, and the time you tried. Do not share your password.

You can read messages but cannot send from the shared address. This usually points to a missing Send As or Send on Behalf permission, or to the wrong From address being selected. Ask the mailbox owner or administrator which sending permission is intended. After it is granted, allow time for it to take effect, restart Outlook, and explicitly select the shared address in a new message.

The mailbox appears but folders are missing or stale. Expand the mailbox and refresh Outlook. Check the same mailbox in Outlook on the web to see whether the folder is present there. If the mailbox works in the web version but not the desktop app, update or restart the app and report the difference to IT. Do not remove an automatically mapped mailbox or change account settings unless your administrator recommends it.

The add option is missing. Make sure you are using the correct Outlook version and a work or school account. Some organizations restrict shared mailbox access or use a different configuration. Check for app updates and ask IT whether the mailbox is an Exchange shared mailbox, a Microsoft 365 Group, or another type of account.

Frequently Asked Questions

Can I add a shared mailbox without an administrator?
No, not if your account has not been granted access. An administrator or mailbox owner must assign the appropriate permissions. You can add the mailbox in Outlook after access is granted, but adding it does not create permission.

Why is the shared mailbox already showing in Outlook?
Your organization may have automatic mailbox mapping enabled. If the mailbox is listed and opens correctly, use that entry rather than adding another one. If it is missing folders or access, contact IT rather than creating duplicate entries.

Can I send email from the shared mailbox?
Yes, if you have the needed Send As or Send on Behalf permission. Select the shared address in the From field before sending. Full Access alone does not necessarily allow you to send as that mailbox.

Will adding it in Outlook use another license?
Many Exchange shared mailboxes do not require a separate license within the service’s limits, but licensing requirements depend on mailbox size, features, and your organization’s setup. Ask your Microsoft 365 administrator; Outlook’s add step does not determine licensing.

Can I add a shared mailbox to Outlook mobile?
Often, yes. Use the app’s account menu and choose Add a Shared Mailbox if available, then select the work account that has access. If the control is missing, update the app or check with IT about your organization’s mobile policies.

Is a Microsoft 365 Group the same as a shared mailbox?
No. A shared mailbox is a common email inbox with delegated access. A Microsoft 365 Group has a group mailbox and may also include tools such as a calendar or files. Ask your administrator which type you have, then add or join it using the matching Outlook feature.

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