Email in shared mailbox

Hi,@Jimhex2024

Thanks for posting your question in the Microsoft Q&A forum.

There's no native feature available in Exchange to track the change of read/unread status of a mail in the shared mailbox.

While the mailbox audit log will record user actions on it, it won't record actions such as marking items as read/unread at all.

You can refer to this link for details:https://zcusa.951200.xyz/en-us/purview/audit-mailboxes#mailbox-actions-for-user-mailboxes-and-shared-mailboxes

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