Unable to share a mailbox folder with a colleague

Lane Victoria 0 Reputation points
2026-08-14T04:06:44.6566667+00:00

I shared a subfolder from my mailbox with a coworker and assigned Viewer permissions. However, my colleague is unable to see or access the shared folder in Outlook. I expected the folder to appear automatically after sharing it, but it does not seem to be visible on their side. Is there something else that needs to be configured for mailbox folder sharing to work in Outlook? What could prevent a user from seeing a folder that has already been shared with them?

Outlook | Web | Outlook on the web for business | Settings
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  1. AI answer

    2026-08-14T04:07:03.5033333+00:00

    Yes. A shared subfolder often will not be visible unless the parent folder hierarchy is also shared.

    What commonly prevents the folder from appearing:

    1. Only the subfolder was shared
      Sharing does not automatically share subfolders, and for a subfolder to be accessible, the parent folder(s) must also be shared first.
    2. The recipient has not added the shared folder or mailbox
      In Outlook on the web, the invitee can add it manually:
      • In the folder pane, right-click Shared with me
      • Select Add shared folder or mailbox
      • Enter the name of the person who shared it
      • Select Add
    3. Permissions are insufficient for the action they are trying to perform
      What the colleague can do depends on the permission level that was granted. If only Viewer/read access was assigned, access is limited accordingly.
    4. Private items expectation
      If the missing content involves items marked Private, those items are not displayed in a shared mailbox in Outlook by design.

    Recommended checks:

    1. Re-share the folder and confirm the colleague is listed under Sharing and permissions.
    2. If it is a subfolder, also share the parent folder(s).
    3. Have the colleague manually add the shared folder from Shared with me in Outlook on the web.
    4. If the issue is about missing private messages or requests, test in Outlook on the web because private items are not displayed in Outlook shared mailbox views by design.
    AI-generated content may be incorrect. Read our transparency notes for more information.

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  2. Elena-VH 1,325 Reputation points Independent Advisor
    2026-08-14T04:23:16.1733333+00:00

    Dear @Lane Victoria

    Based on the behavior you described, this is expected. When a mailbox folder is shared, it does not always appear automatically in the recipient's Outlook folder list. The recipient may need to manually add the shared mailbox or folder before it becomes visible.

    First of all, please ask your colleague to follow these steps in Outlook on the web:

    • In the folder pane, right-click Shared with me > Select Add shared folder or mailbox.
    • Enter the name or email address of the person who shared the folder > Select Add.
    • Expand the mailbox under Shared with me to view shared folders.
    • For reference: Share and access another person's mailbox or folder in Outlook

    Or you can go to Outlook settings > Account > Shared with me > and enter the name or email address of the person who shared the folder.

    User's image

    Important:

    • If only a subfolder was shared, Outlook must also provide visibility to the folder hierarchy above it (for example: Mailbox > Inbox > Project Folder).
    • If the parent folders do not already have permissions assigned, Outlook automatically grants the minimum required permission, Folder Visible, so the recipient can navigate to the shared folder.
    • This permission only allows the user to see the folder structure and reach the shared folder; it does not grant access to view or interact with the contents of the parent folders.

    However, if the issue persists, please try the following:

    • Re-share the folder and confirm the colleague is listed under Sharing and permissions.
    • Remove and re-add the shared folder under Shared with me.
    • Sign out and back into Outlook on the web, then check whether the folder becomes visible.

    I hope the information shared is helpful. If you have any questions, please feel free to reach out. I'm looking forward to your update.

    If the answer is helpful, please click "Yes" and kindly upvote it. If you have extra questions about this answer, please click "Comment".   

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