1.Open the Exchange Systems Manager.
2.Navigate to the Administrative Group.
3.Click the Action menu and select Delegate Control options.
4.The Exchange Administration Delegation Wizard launches.
5.Click Next on the Welcome to the Exchange Administration Delegation Wizard screen.
6.Click Add.
7.Provide the details of the Active Directory user account or group that you are delegating control over the Administrative Group to.
8.Select the Exchange role which should be assigned. Click OK.
9.Click Next and then click Finish.

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