Run a non-owner mailbox access report in Exchange Online
Important
This report is no longer available in the classic Exchange Admin Center and will not be offered in the new EAC.
Note
Classic Exchange admin center is in the process of being deprecated in worldwide deployment. We recommend that you search the audit log in the Microsoft Purview compliance portal. For more information, see Deprecation of the classic Exchange admin center in WW service and Search the audit log in the compliance portal.