Figure 1: In Exchange Server 2003/2000, mailbox permissions can be managed from ADUC. Since Exchange Server 2007 does not use ADUC for recipient management, this can’t be done using ADUC. The shell is your friend when it comes to assigning Full Mailbox Access and other mailbox permissions.You can use the Add-MailboxPermission command from the shell to assign it.y Bharat Suneja. Follow-up to previous post “ HOW TO: Assign SendAs right using Exchange shell ” – the ability to assign SendAs and ReceiveAs permissions is preserved in Active Directory Users & Computers (ADUC), but the ability to grant Full Mailbox Access permission isn’t available.