This cmdlet allows you to grant permissions to a mailbox, for example, granting a user full access to another user's mailbox.
To run the Add-MailboxPermission cmdlet, the account you use must be delegated, at minimum, the following on the server where the mailbox resides:
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Exchange Server Administrator or Exchange Organization Administrator
In addition, the account you use may require additional permissions within Active Directory to perform certain operations. To make sure that you have the appropriate permissions, the account you use must be delegated the Account Operators permission in the domain where target mailbox-enabled account exists.
For more information about permissions, delegating roles, and the rights that are required to administer Exchange Server 2007, see Permission Considerations.