Classic Outlook to New Outlook: Shared Contacts Folder – Workaround for delegated contact folders

You are moving from Classic Outlook to the new Outlook for Windows and find that shared contacts folders from delegated mailboxes no longer appear. The new Outlook does not support the automatic display of shared contacts from mailboxes where you have delegate access. This article explains the technical reason for this limitation and provides a step-by-step workaround to access delegated contact folders in new Outlook.

Why Delegated Contact Folders Are Missing in New Outlook

Classic Outlook (the legacy desktop app) uses MAPI profiles and delegate permissions to display shared folders from another user’s mailbox automatically. When you are granted delegate access to a mailbox, Classic Outlook adds that user’s Calendar, Inbox, and Contacts folders directly into your folder pane. The new Outlook for Windows is built on a different technical foundation. It uses REST-based sync and does not support the MAPI delegate model. As a result, shared contacts folders from delegated mailboxes do not appear automatically in the folder list.

The new Outlook does support shared mailboxes, but only if they are added as an additional account. This is not a bug — it is a design change. The workaround is to add the shared mailbox as a separate account in new Outlook. Once the shared mailbox is added, its entire folder structure, including the Contacts folder, becomes visible.

What the New Outlook Supports for Shared Mailboxes

New Outlook supports adding shared mailboxes that you already have permission to access. It does not support:

• Automatic delegation of folders from another user
• Display of shared contacts from a delegate mailbox without adding the mailbox as an account
• Modifying delegate permissions from within new Outlook

Workaround: Add the Shared Mailbox as an Additional Account

This workaround works for any mailbox where you have Full Access or delegate permissions. You must know the email address of the shared mailbox. If you are an admin, ensure the mailbox is licensed or at least has an Exchange Online license assigned.

1. Open new Outlook and click your profile icon
   Click the profile icon in the top-right corner of the new Outlook window. A menu opens with your account information.
2. Select Add Account
   From the menu, click Add Account. The Add Account dialog appears.
3. Enter the shared mailbox email address
   Type the full email address of the shared mailbox (for example, sharedmailbox@contoso.com). Click Continue.
4. Authenticate if prompted
   If the mailbox requires authentication, enter your credentials. In most delegate scenarios, you will be asked to sign in with your own account, and the shared mailbox will be added automatically.
5. Wait for the mailbox to sync
   New Outlook begins syncing the shared mailbox. The mailbox appears in the folder pane on the left, below your primary mailbox. Expand it to see the Contacts folder.
6. Access the shared Contacts folder
   Click the arrow next to the shared mailbox name to expand its folders. Click Contacts to view, edit, and manage the shared contacts.

If the Shared Mailbox Does Not Appear

If the mailbox does not appear after adding it, verify that you have at least Read permission on the mailbox. Contact your Exchange admin to confirm permissions. If the mailbox is not licensed, you may receive an error. In that case, ask your admin to assign an Exchange Online license to the shared mailbox.

When the Workaround Does Not Work

Shared Mailbox Requires Manual Credential Entry

Some organizations block automatic authentication for shared mailboxes. If you see a prompt asking for a username and password, enter the shared mailbox credentials if you have them. If you do not have the password, ask the mailbox owner or admin to provide it or to reset it.

Contacts Folder Still Not Visible

If the shared mailbox appears but the Contacts folder is missing, the mailbox may not have a default Contacts folder. This can happen if the mailbox was created without a contacts folder or if the folder was deleted. Ask the mailbox owner to create a new Contacts folder in their own Outlook or Outlook on the web. After the folder is created, sync the mailbox again in new Outlook.

Cannot Edit Contacts in the Shared Mailbox

If you can view contacts but cannot edit them, you have Read-only permission. Contact your Exchange admin to request Editor or Owner permission on the mailbox. Editing permissions are set on the mailbox, not on individual folders.

Classic Outlook vs New Outlook: Shared Contacts Folder Support

Item	Classic Outlook	New Outlook
Delegate contacts shown automatically	Yes, via MAPI profile delegation	No, does not support MAPI delegate model
Add shared mailbox as separate account	Not required for delegate access	Required workaround to see shared Contacts folder
Edit shared contacts	Supported with proper delegate permissions	Supported after adding the mailbox as an account
Modify delegate permissions	Yes, from Account Settings	Not supported, use Exchange admin center

You can now access shared contacts from delegated mailboxes in new Outlook by adding the shared mailbox as an additional account. This workaround restores the visibility of the Contacts folder and allows you to edit contacts if you have write permissions. For a permanent solution, ask your Exchange admin to convert the delegated mailbox to a shared mailbox with Full Access permission. The new Outlook will then treat it as a regular shared mailbox. As an advanced tip, use Outlook on the web to manage delegate permissions if you need to grant access to other users in your organization.