Shared Mailbox in Outlook on a PC: Add It Step by Step

To add a shared mailbox in Outlook on a Windows PC, 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. In new Outlook, right-click Shared with me and choose Add shared folder or mailbox. In classic Outlook, use File > Account Settings > Account Settings and add it under your account’s advanced settings. The mailbox lets you read and manage a team address, such as support@contoso.com, without signing in as that mailbox.

What You’ll Need

Permission to the mailbox. A Microsoft 365 or Exchange administrator must grant your work or school account access. Ask for Full Access to open and manage the mailbox. If you also need to send messages from its address, ask for Send As or Send on Behalf permission.
The mailbox address. Get its full email address from your administrator or team owner; a display name alone may not uniquely identify it.
A supported Outlook account. Outlook must be signed in with the same work or school account that was granted permission. A personal Outlook.com account generally cannot open an organization’s Exchange shared mailbox.
A little time for access to update. Newly granted permissions can take a while to reach Outlook. Close and reopen the app if access was just added.

Step-by-Step

Confirm that your access has been granted. Contact the mailbox owner or IT administrator and confirm the exact mailbox address and that your account has Full Access. Outlook cannot add a mailbox merely because you know its address. If you need to reply as the shared address, confirm that Send As or Send on Behalf permission has also been assigned; Full Access alone does not necessarily allow sending from that address.
Identify which Outlook for Windows you are using. Microsoft 365 may provide new Outlook or classic Outlook. New Outlook has a simplified interface and may show a toggle labelled Try the new Outlook in classic Outlook. Classic Outlook has the traditional ribbon and a File tab. Follow the matching set of steps below rather than looking for a button that belongs to the other version.
In new Outlook, open the shared mailbox list. Select Mail in the app’s navigation, then find Shared with me in the folder pane. If the pane is hidden, open the navigation pane using the button at the top left. Right-click Shared with me and select Add shared folder or mailbox. Depending on your layout, you may need to expand the section first.
Enter the mailbox address in new Outlook. Type the full email address of the shared mailbox in the dialog, then select Add or the matching result. If Outlook offers several matches, check the address carefully before choosing one. The mailbox should appear in the folder pane under Shared with me. Expand it to see folders such as Inbox, Sent Items, and Deleted Items.
In classic Outlook, open the account settings. Select File > Account Settings > Account Settings. On the Email tab, select the Microsoft 365 or Exchange account that has been granted access, then choose Change. In the account settings window, select More Settings, open the Advanced tab, and select Add under the mailboxes section.
Add the mailbox in classic Outlook. Enter its full email address or name in the add-mailbox box and select OK. Select Apply, then OK to close the additional settings. Continue with Next and Finish if those buttons appear, then close the Account Settings window. Quit and reopen Outlook if the mailbox does not show up straight away. It should appear in the folder pane below your own mailbox.
Open a folder and check that its contents load. Expand the shared mailbox and select Inbox. The first load can take a few minutes, especially for a large mailbox or a slow connection. You can also check other folders, such as Calendar, if you have permission to use them. Do not move or delete messages just to test access; use a message you are authorized to manage.
Choose the shared address when sending, if permitted. Start a new message. If the From field is not visible, select Options > From in the message window, then select From and choose or enter the shared address. Send a brief, appropriate test only if your workplace allows it. If Outlook reports that you do not have permission, ask the administrator to grant Send As or Send on Behalf access. Do not assume that a message sent from your personal address came from the shared mailbox.

Outlook for Mac: These instructions are for Windows. In Outlook for Mac, the mailbox is commonly added through Tools > Accounts, selecting your work account, then Delegation and Sharing > Shared With Me and the add button. Labels can vary by Outlook release. If you use Outlook in a browser instead, its folder-pane options differ from both Windows desktop versions.

Common Mistakes

Trying to add a mailbox before permission is assigned. Typing an address into Outlook does not grant access. If it cannot find or open the mailbox, verify that the administrator granted access to the account currently signed in.
Confusing Full Access with sending permission. Full Access is for opening and managing mailbox contents. Sending from its address may require a separate Send As or Send on Behalf permission. Ask for the specific permission your team uses.
Following instructions for the wrong Outlook version. The classic Outlook Advanced tab is not the route used in new Outlook. Check whether your app has the traditional File tab, then use only the relevant set of steps.
Entering a person’s name or the wrong address. Search results can include similarly named mailboxes. Confirm the full address with the mailbox owner before adding or sending.
Adding the mailbox as if it were a separate sign-in. A shared mailbox normally opens through your own work account. Do not request or use another person’s password to access it.
Assuming a missing Sent Items message means it was not sent. Depending on the organization’s mailbox settings, a message sent as the shared address may be saved in your personal Sent Items rather than the shared mailbox’s Sent Items. Ask IT about the configuration before sending it again.

Tips

Pin or favorite frequently used folders. In the folder pane, use the available context menu or drag a frequently used folder into Favorites, if that option is available in your Outlook version. This makes a busy shared Inbox easier to reach without changing its permissions.
Use the shared mailbox’s own folders. Keep team messages in the shared Inbox or agreed subfolders so colleagues can see the same work and avoid handling a request twice. Follow your organization’s rules for assigning, categorizing, and archiving messages.
Check the From line before sending. Outlook can remember a previous sender choice or default to your personal address. Verify the From field on every message where the sender identity matters.
Allow time for mailbox content to synchronize. Outlook may download shared folders in the background. If older messages are not visible yet, check your connection and give synchronization time before changing settings or repeatedly adding the mailbox.
Ask for the least access that fits the task. If you only need to read messages, tell the administrator. If you need to manage messages or send replies, specify that too. The mailbox owner or IT team should decide which permissions are appropriate.

Troubleshooting

The mailbox does not appear after adding it: Check that you selected the correct work account and entered the full mailbox address. Close and reopen Outlook. In new Outlook, expand Shared with me; in classic Outlook, expand the mailbox list beneath your account. If it is still absent, ask the administrator to confirm that Full Access was granted to your exact signed-in account and allow time for the change to propagate.

Outlook says it cannot find the mailbox: Confirm the address with the mailbox owner and check for spelling errors or an outdated address. The mailbox may not be a shared mailbox, may have been removed, or may not yet be available to your account. Contact IT rather than repeatedly trying alternate addresses or adding someone else’s account.

The mailbox opens, but folders are missing or show an error: Check your internet connection, then close and restart Outlook. Confirm with the owner that the folder exists and that your access covers it. If only a particular folder fails, report its name and the exact error to IT; do not change mailbox permissions yourself.

You can read messages but cannot send from the shared address: This usually means that sending permission has not been granted, or the message is being sent from your personal account. Ask IT whether you should have Send As or Send on Behalf access, then select the shared address in the From field. After permission is added, restart Outlook and allow time for it to update. Follow your organization’s rules about which sending option to use.

The mailbox appears twice: Outlook may have added it automatically when access was granted, and you may also have added it manually. Check both entries before removing anything. In classic Outlook, the manually added mailbox can usually be removed through the same File > Account Settings > Account Settings > Change > More Settings > Advanced path by selecting it and choosing Remove. This removes the mailbox from your Outlook view; it does not delete the mailbox or its messages. Ask IT if you are unsure which entry is safe to remove.

Outlook freezes or loads very slowly: A large shared mailbox or many shared folders can take time to synchronize. Wait for initial loading to finish, restart Outlook, and check whether the problem is limited to one mailbox. If it persists, give IT the Outlook version, mailbox address, and any error text. Avoid deleting your Outlook profile or removing data files as a first step; those changes can disrupt other account settings and should be guided by support.

Frequently Asked Questions

Does a shared mailbox have its own password?
A shared mailbox is normally accessed through the individual work accounts that have been granted permission. You sign in to Outlook with your own account; do not try to sign in as the shared mailbox or ask a colleague to share a password.

Why did the mailbox appear automatically?
Exchange can automatically map a mailbox into classic Outlook after Full Access is granted. In that case, look in the folder pane before adding it manually. New Outlook may show it under Shared with me. Automatic appearance can take time, so restart Outlook if the permission was just added.

Can I add a shared mailbox if I only have its email address?
No. You also need your organization to grant your account permission. The address identifies the mailbox, but it does not provide access. Contact the mailbox owner or IT administrator to request the right level of access.

Can I send and reply using the shared mailbox address?
Yes, if an administrator has granted Send As or Send on Behalf permission. Select the shared address in the From field and confirm it is correct before sending. Full Access by itself may let you read and manage messages without letting you send as the mailbox.

Will adding the mailbox remove it from my colleagues’ Outlook?
No. Adding it to your Outlook view does not remove it for other users and does not create a separate copy of the mailbox. Changes you make to shared messages or folders can be visible to colleagues, so follow your team’s handling practices.

Can I add the mailbox to Outlook on the web too?
Often, yes, if your organization allows it and your account has permission. Outlook on the web has its own shared-folder or mailbox options, so the Windows desktop menu paths in this guide do not apply there. If the option is missing, ask IT whether web access is enabled.

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