New Outlook not showing Read emails in Shared Mailbox

Wes Marine 0 Reputation points
2026-10-08T15:32:25.6766667+00:00

I found a very similar issue someone posted in another thread, but their issue is occurring with unread emails vs my issue which is occurring with read emails.

Use Case: User clicks unread email #1 inside of the Shared Mailbox prompting the reading pane to display > User clicks unread email #2 in the mailbox and then email #1 now disappears from the Inbox > User clicks unread email #3 in the mailbox and then email #2 now disappears from the Inbox

This happens to every email inside of the inbox and the only way that they reappear in the mailbox is if you physically leave that folder, open another, and then go back to the Inbox. I notice that this does not happen on the Web Outlook. Users report that this issue started a few weeks ago.

Outlook | Windows | New Outlook for Windows | For business
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  1. Michelle Nguyen 2,025 Reputation points Independent Advisor
    2026-10-08T16:28:10.5633333+00:00

    Hi @Wes Marine

    Thank you for describing the behavior so clearly. Based on your reproduction steps, the messages do not appear to be deleted. Instead, the message list in the shared mailbox is not refreshing correctly after an email changes from unread to read, because the messages reappear as soon as you leave the folder and return to the Inbox.

    Could you please try the following?

    -When an email disappears, select View > Sync and check whether it immediately reappears.

    -Check whether the Inbox currently has an Unread filter or another filter enabled. Microsoft documents that read/unread filters can make messages disappear from an Outlook folder without deleting them.

    -In new Outlook, open Settings > Accounts > Shared with me, expand the shared mailbox, and check whether you have the option to Convert or add it as an account. Microsoft states that this requires Full Access permission and that the option might not yet be available in every version of new Outlook.

    Ref: Manage shared mailbox settings in new Outlook

    -Update new Outlook to the latest available version and restart it before testing again.

    -If possible, test the same shared mailbox with another user in new Outlook to determine whether the behavior follows the shared mailbox or only affects particular users.

    Since the issue does not occur in Outlook on the web, the mailbox items still exist on the server. This points more toward a synchronization or message-list refresh issue in new Outlook than messages actually being removed.

    I could not find a Microsoft article documenting this exact behavior, where each message disappears immediately after being marked as read.

    I’m just another user on this forum, not a Microsoft employee, so please keep me updated.

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