The Shared Mailbox Security report lists all of the shared and room mailboxes in your Office 365 environment, along with their current access permissions.
The Data Table
You can add, remove or re-order these columns to display the information in a customised way.
This report can be filtered, allowing you to generate bespoke reports about the mailbox in a particular Department, Country or any other category you choose.
As with all of the reports, this information can be customized, filtered and scheduled.