How to Add a Shared Mailbox in Outlook: Team Access Guide

01Use your own work login

Sign in with your own work account. Don’t sign in as the shared mailbox, and don’t ask anyone for its password. Microsoft says this in three places:

• Its guide to using a shared mailbox in Outlook says the shared mailbox’s own account should stay disabled.
• Its admin guide to creating a shared mailbox says sign-in is blocked by default on a new one.
• Its overview of shared mailboxes says to keep sign-in blocked and not to use the system-generated password.

02Work out which Outlook you’re in

On Windows, look at the top right of the window. A Settings button there means you have new Outlook. No Settings button means classic Outlook. That’s the test on Microsoft’s “What version of Outlook do I have?” page, and it’s for Windows only.

For everything else:

• Work webmail is outlook.office.com or outlook.office365.com. The address outlook.live.com is for personal accounts, and a personal Outlook.com sign-in won’t show the work mailbox.
• Windows Mail isn’t classic Outlook.
• On a phone, the built-in Mail app isn’t Outlook mobile. If you need to check your version, look inside the Outlook app itself. Don’t follow steps for Apple Mail, Gmail or Samsung Mail.

Microsoft’s version page applies to Outlook for Microsoft 365, Outlook 2024, 2021, 2019 and 2016, and new Outlook for Windows. Getting the version right matters because the steps don’t cross over. A classic guide that starts with File, Account Settings won’t match anything in new Outlook.

03How to add a shared mailbox in Outlook for your version

In new and classic Outlook for Windows, the mailbox can show up by itself. Microsoft calls this automapping. Its admin guide and permissions guide both say automapping is on by default when the admin gives access to you directly, but it doesn’t work when access comes only through a security group (a group of people the admin manages together). You can’t see which way you were added, so if the mailbox is missing, ask your admin how access was granted. Don’t try to change the permission yourself.

Showing up after a restart only happens on Windows. Outlook for Mac doesn’t automap, the mobile app has no automatic step, and on the web you add it by hand. Find the row that matches your screen, then follow that version’s steps below.

New Outlook for Windows

Close new Outlook and open it again. If you were added directly, the mailbox should appear in the Folder pane. If you were only just added, wait a few minutes and restart once more. Ignore longer waits quoted on other sites.

If it still isn’t there, add it by hand. From Microsoft’s shared mailbox guide for Outlook:

1. Select Mail.
2. Right-click your account name.
3. Select Add shared folder or mailbox.
4. Type the shared address, like bids@example.com, and follow the prompt.

The mailbox shows up under Shared with me. Sending from it is covered further down.

Classic Outlook for Windows

Use these steps only if there’s no Settings button. Restart Outlook first, in case the mailbox appears by itself. If it doesn’t, the same Microsoft guide gives these steps:

1. Select File, then Account Settings, then Account Settings again.
2. On the Email tab, highlight your work account, not a personal Outlook.com account.
3. Select Change, then More Settings, then Advanced, then Add.
4. Type the shared address.
5. Select OK, OK, Next, Finish, then Close.

Outlook on the web

The web version doesn’t use the desktop Account Settings, and Microsoft doesn’t call it new Outlook. It’s the route for a coordinator on a job-site computer: sign in at outlook.office.com or outlook.office365.com, then follow the web steps in the same Microsoft guide:

• On Exchange Online (the usual Microsoft 365 setup), right-click Folders, select Add shared folder or mailbox, and type the address.
• If your company runs its own Exchange server (called on-premises), the same command is on your main mailbox name instead of Folders.

There’s also Open another mailbox, which opens the shared mailbox in its own browser window so new-mail notices for it can come through. That’s a separate option from adding the folder. To take the mailbox back out of your folder list, use Remove shared folder. It doesn’t reset anything else.

Outlook for Mac

Outlook for Mac doesn’t automap, so restarting won’t make the mailbox appear. Add it by hand. Microsoft’s guide to shared folders in Outlook for Mac gives two ways:

• Tools, then Accounts, select your work account, then Delegation and Sharing, the Shared With Me tab, and the plus button.
• Or File, then Open, then Shared Mailbox.

Don’t add the shared mailbox as an Exchange account using its own sign-in details. Microsoft’s page says that isn’t recognized as adding a shared mailbox.

Microsoft set October 2026 as the end of support for legacy Outlook for Mac. If you don’t see these menus, ask which Mac version of Outlook is installed rather than guessing. The same page says only Full Access is fully supported on Mac, and Full Access still doesn’t include sending.

Outlook for iOS or Android

From Microsoft’s guide to shared mailboxes in Outlook mobile:

1. Sign in to your main work account in the Outlook app.
2. Tap Add Account, then Add a Shared Mailbox.
3. If you have more than one account in the app, pick the one that has access to the shared mailbox.

This only works when both your mailbox and the shared mailbox are in Exchange Online, using Microsoft’s own sync. If they aren’t, ask your admin rather than switching to another mail app. There are no steps for Apple Mail, Gmail or Samsung Mail.

04Check the From line before you send

Check the From line on every new message and every reply. That’s how you send email from a shared mailbox instead of your own address. Each version does it a little differently (see Microsoft’s shared mailbox steps):

• New Outlook: Home, New, Mail. Then on the Options tab, select Show From, and choose the shared address in From (or Other email address).
• Classic Outlook: New Email, then Options, From. Choose the shared address in From (or Other email address).
• Web: the first time, select Show From, then remove the From address and type the shared address.
• Mac: From can list the shared mailbox even when you don’t have permission to send from it. If you don’t, the message won’t send.
• Mobile: Microsoft doesn’t document From steps for the phone app. Send from the desktop or web version, or ask your admin.

Which permission you have

Being able to open the mailbox doesn’t mean you can send from it. Microsoft’s admin guide and permissions guide both say Full Access lets you open and change items, but not send. Sending takes one of two other permissions:

• Send As: the message looks like the mailbox sent it. Recipients see only the shared address.
• Send on Behalf: recipients see your name “on behalf of” the mailbox. Replies go to the mailbox or group, not to you.

If you have both, Send As is used.

If sending fails

If a message won’t send, or you get an error saying you don’t have permission to send on behalf of that user, ask your admin whether you have Send As or Send on Behalf. Don’t go hunting for a setting yourself.

There’s one exception. Microsoft’s overview of shared mailboxes says that error can also come from a delay of about an hour after a mailbox is created or a new person is added. If that fits, retry once, and only for that error. Sending also fails in the desktop app when the mailbox is hidden from the address list, which your admin can check.

Where your sent copy goes

Microsoft’s own pages disagree on where a copy of what you send is kept. Its troubleshooting article on sent mail and its guide to converting a distribution list describe the default differently, so don’t assume a folder. If your team can’t see a message you sent, ask your admin where sent copies are stored. Don’t try the command or registry fixes in that troubleshooting article. For new Outlook, it lists only a server-side fix, which is your admin’s job.

05If it’s still missing, stop and ask

Stick to four checks: the wrong account, the wrong app, missing permission, or the mailbox still missing after the wait and one restart. Past that, hand it to your admin:

1. bids@example.com is still missing after the wait and one restart. Ask whether you were added as a person, not only through a group, and whether you’re on a Mac, which doesn’t automap.
2. You can read it, but sending fails or From won’t switch. Ask whether you have Send As or Send on Behalf.
3. A coworker can’t see a message you sent. Ask where sent copies are kept.
4. The instructions you found say to create the mailbox, run a command or type its password. Stop. That’s a different job.

When you ask, include which Outlook you’re using, the work address you’re signed in with, the shared address, and whether you can read its mail. Something like:

Whatever happens, don’t try to work around the permissions. Skip PowerShell and other commands, and don’t delete your Outlook profile, edit the registry or clear the cache.

Setting up company email from scratch? Start with our guide to creating a business email.