From Users window, select users and retrieve mailbox permissions by click on the button with the same name.
In this submodule, you will see who has access to selected users' mailboxes and with which permissions. You'll be able to add or remove delegates, and change their permissions.
Retrieving and managing mailbox permissions in sapio365 requires PowerShell authentication.
You will be prompted to authenticate twice when retrieving information.
Change the type of the selected mailbox permission (advanced).
Give Full Access to the selected mailbox.
Remove selected mailbox permissions.
Show System Defaults
Add default mailbox permissions to the grid (NT AUTHORITY\SELF).