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Delegated Administration in Exchange Online

RBAC was introduced in Exchange 2010 to allow precise permission management within the Exchange organization for administrators and users. With RBAC, you can configure and control in a very granular way the administrative tasks that administrators or users can perform. RBAC controls both the administrative tasks that can be performed and the extent to which users can now administer their own mailbox and distribution groups. Understand that, with RBAC, it doesn’t matter what Active Directory permissions you have when using Exchange management tools—everything is authorized and controlled via RBAC. You can define precisely which cmdlets and parameters a user can run or modify.