These permissions can be assigned to other user mailboxes via Microsoft 365 admin center or Exchange Online PowerShell cmdlets. It runs on PowerShell 7 which is able to leverage modern authentication on multiple platforms, including Azure Cloud Shell, Microsoft Windows and Apple MacOS. When I use the Exchange Online one, I get the following two errors: #1. Security) does a great job of getting file or folder permissions (aka the Access Control List or ACL). Let us know what these mailbox permissions are: Read and Manage: This permission allows the assigned user mailbox(es) to read as well as manage emails in the user mailbox on which the permission is assigned.