Remove and Re-Add a Shared Mailbox in Outlook

To remove and re-add a shared mailbox in Outlook, remove its shared-folder entry from your Outlook view, then add it again after confirming you still have permission to access it. In classic Outlook for Windows, use File > Account Settings > Account Settings > Change > More Settings > Advanced; in new Outlook, use the folder pane’s shared-mailbox controls.

What Removing a Shared Mailbox Actually Does

A shared mailbox is an Exchange mailbox that multiple people can use, commonly for addresses such as support@company.com or accounts@company.com. Removing it from Outlook normally removes the mailbox from your folder list or disconnects its local account configuration. It does not delete the mailbox, erase its messages, or revoke your access rights on the organization’s Exchange server.

That distinction matters: Outlook controls how the mailbox appears on your device, while an administrator controls whether your account has permissions such as Full Access, Send As, or Send on Behalf. If your organization removes your permissions, adding the mailbox again will not restore access. Conversely, removing the mailbox from your Outlook view does not prevent you from accessing it elsewhere if your permissions remain active.

Before making changes, identify which Outlook version you are using. Classic Outlook for Windows has a desktop ribbon and File tab. New Outlook for Windows has a redesigned interface and a Settings gear. Outlook on the web runs in a browser, and Outlook for Mac has its own account settings. The steps differ, so avoid following instructions for a different version.

Check Access and Prepare Before Removing It

If the mailbox is not working, first determine whether the problem is a stale Outlook entry or a permissions issue. Ask whether you can open the mailbox in Outlook on the web, or check with your Microsoft 365 administrator that your account still has the required access. Full Access lets you open and manage mailbox contents; it does not automatically grant permission to send messages as that mailbox.

Before removing the entry, note the mailbox’s exact address and the Outlook account it is associated with. If you have unsent messages, drafts, or messages sitting in the Outbox, check them before changing the mailbox connection. These items may not be safely recoverable from a different account or view. Also make sure Outlook is online and fully updated if the commands described below are missing.

Confirm the shared mailbox address and that you are signed in with the intended work or school account.
Ask an administrator to verify Full Access if the mailbox cannot be opened or added.
Keep Send As or Send on Behalf permissions in mind if the issue is sending rather than opening mail.
Close Outlook before changing account settings in classic Outlook, then reopen it to check the result.

Remove and Re-Add It in Classic Outlook for Windows

In classic Outlook for Microsoft 365 on Windows, a shared mailbox is often listed as an additional mailbox under your Exchange account. Use the following process to remove and then add that entry again:

Open Outlook and select File > Account Settings > Account Settings.
On the Email tab, select your work or school Exchange account, then choose Change.
Select More Settings, then open the Advanced tab.
Under Open these additional mailboxes, select the shared mailbox and choose Remove. Confirm the change, then select OK and finish closing the account settings windows.
Exit Outlook completely and start it again. If the mailbox has disappeared, return to the same Advanced tab and choose Add under Open these additional mailboxes.
Enter the shared mailbox’s name or email address, select the matching result if prompted, and confirm the settings. Restart Outlook once more if the mailbox does not appear immediately.

Names of buttons can vary slightly with Outlook builds and account configuration. If the mailbox is not listed under Open these additional mailboxes, it may have been added automatically, added through a different Outlook feature, or configured as a separate account. Do not remove your primary work account simply to get rid of one shared mailbox. If the mailbox is configured as a separate account, ask your administrator or follow the removal controls for that specific account instead.

Use New Outlook for Windows

New Outlook for Windows uses the folder pane rather than the classic Advanced account-settings screen for many shared mailboxes. To remove a mailbox that was added as a shared folder, find it in the folder pane, right-click its name, and choose Remove shared folder or the equivalent remove command shown in your version. This removes it from your Outlook view; it does not delete the shared mailbox.

To add it again, right-click Shared with me in the folder pane and choose Add shared folder or mailbox. Enter the shared mailbox’s name or address and select the correct result. Depending on the version and layout, you may also find shared-mailbox management under Settings > Accounts > Shared with me. If a command is not present, check that you are in new Outlook and that the mailbox has not been added as a separate account.

After adding it, allow Outlook a little time to load folders and messages. A large mailbox or a slow connection can make the mailbox appear before its contents finish syncing. If it does not appear, close and reopen Outlook, verify the signed-in account, and ask an administrator to check access before repeating the remove-and-add cycle.

Understand Automatic Mapping and Duplicate Mailboxes

When an administrator grants Full Access to a user directly in Exchange, Outlook may automatically map the shared mailbox into that user’s Outlook profile. This behavior is called automapping. It can make a mailbox appear without the user manually adding it, which is convenient but sometimes confusing when you are trying to remove it.

If an automatically mapped mailbox returns after removal or appears twice, repeatedly deleting and adding entries is unlikely to solve the underlying cause. The mailbox may be both automatically mapped and manually added, or the administrator may have changed its permissions. Ask the Microsoft 365 or Exchange administrator to check how access was granted and whether automapping is enabled. Administrators can adjust the mailbox permissions or automapping configuration; ordinary Outlook users generally cannot control that server-side behavior from the desktop app.

Do not remove access permissions in an attempt to clean up your own Outlook folder list unless you are authorized to administer the mailbox. Removing Full Access can affect other work, and it is different from removing a local Outlook entry.

Permissions, Sending, and What Re-Adding Cannot Fix

Opening a shared mailbox and sending from its address are separate capabilities. Full Access lets a person open the mailbox and work with its contents, but Send As and Send on Behalf are separate permissions. Send As makes a message appear to come from the shared address; Send on Behalf shows that the user sent it on behalf of that mailbox. An administrator must grant the appropriate sending permission.

If you can read messages but cannot send from the shared address, removing and re-adding the mailbox is not usually the right fix. Check the From field, confirm that you selected the shared address, and ask the administrator to verify the relevant send permission. Permission changes can take time to reach Outlook, so a newly granted right may not work instantly. Restarting Outlook or allowing time for the change to propagate can help, but repeated reconfiguration cannot substitute for the permission itself.

Likewise, an error saying that the mailbox cannot be found can result from a mistyped address, a permission that has not propagated, or an account connected to the wrong organization. Record the exact error and share it with your help desk rather than removing your primary account or changing unrelated settings.

Outlook for Mac and Outlook on the Web

On Outlook for Mac, shared mailbox controls depend on whether you are using the new or legacy interface and on the account configuration. In supported versions, look in Outlook > Settings > Accounts, select the Exchange account, and open Delegation and Sharing or Shared With Me to manage shared mailboxes. If the mailbox is listed as a separate account, select that account in the account list and use the account removal control instead. Removing an account from the Mac app does not delete the mailbox on the server.

For Outlook on the web, you can often open a mailbox you have permission to use by selecting your profile or account menu and choosing Open another mailbox. This opens the shared mailbox in a separate browser view; it is not necessarily the same as adding a permanent folder entry in the desktop app. Some organizations also provide a shared-folder option in the folder pane. If you only need temporary access, opening another mailbox on the web can help you check whether the mailbox and your permissions are working before changing the desktop setup.

Common Problems After Re-Adding

If the mailbox is missing, verify that you added the correct address and that you are using the account to which access was granted. Then restart Outlook and check for any permission error. In classic Outlook, confirm the mailbox is listed under the correct Exchange account’s Advanced settings. In new Outlook, check the folder pane and the Shared with me area. A mailbox added to a different profile or account may not show up where expected.

If the mailbox appears but its folders are empty or incomplete, give synchronization time and check your internet connection. A cached view can lag behind server changes. If only older messages are missing, the mailbox’s retention or folder policies may affect what is available; Outlook’s remove-and-add process does not change those policies. Ask the administrator before assuming that messages have been deleted.

If the mailbox returns after removal, investigate automapping or a duplicate manual entry. If you cannot remove it, check that you are using the right Outlook interface and that you are not attempting to remove your own primary account. If Outlook repeatedly prompts for credentials, verify that the correct organization account is signed in and contact support if the prompt continues. Avoid deleting Outlook profiles or removing your primary account as an early troubleshooting step, since that can affect other mailboxes and settings.

Frequently Asked Questions

Will removing a shared mailbox delete its emails?
No. Removing the mailbox from Outlook normally removes its local view or connection. Messages remain in the shared mailbox on Exchange unless someone with appropriate access deletes them or an administrator changes the mailbox.

Why does the shared mailbox come back after I remove it?
It may be automatically mapped because your administrator granted Full Access, or it may have been added both automatically and manually. Ask your administrator to check the permission setup rather than repeatedly removing the entry.

Can I add a shared mailbox without administrator help?
Only if your account already has the necessary permissions and your organization permits the relevant Outlook feature. If Outlook cannot find the mailbox or reports that you lack access, an administrator must check or grant the permission.

Does Full Access let me send email as the shared mailbox?
Not necessarily. Full Access allows you to open the mailbox, while Send As and Send on Behalf are separate permissions. Ask the administrator for the appropriate sending right if you need to send from that address.

Should I remove and re-add the mailbox if it is not syncing?
Try checking connectivity, restarting Outlook, and confirming access first. Re-adding can help with a stale local entry, but it will not fix missing permissions, server-side restrictions, or an administrator-controlled configuration.

Try it: the Date Difference Calculator: days, months, years and weekdays between two dates, with the DATEDIF formulas.

More in How-to basics

Sources: Function behaviour and menu paths: Microsoft Support documentation for Excel. Method & sources

Spotted an error in this guide? Let us know.