Delegate the Server Administrator role to a user on an Exchange Server (2003, 2007 or 2010)

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Procedure

For Microsoft Exchange Server 2003, complete the following steps to grant full administrator rights to the user:

1. Click Start > Programs > Microsoft Exchange > System Manager. The Microsoft Exchange Systems Manager opens.
2. Click Action > Delegate control. The Exchange Administration Delegation Wizard opens. Click Next.
3. On the Users or Groups page, click Add.
4. In the Delegate Control window, click Browse. Select the new user that you have created, and then click OK.
5. From the Role list, select Exchange Full Administrator, and then click OK.
6. Click Next, and then click Finish.

For Microsoft Exchange Server 2007, complete the following steps to grant recipient administrator rights to the user:

1. Click Start > Programs > Microsoft Exchange Server 2007 > Exchange Management Console. The Exchange Management Console window opens.
2. In the Console tree, click Organization Configuration.
3. In the Action pane, click Add Exchange Administrator.
4. On the Add Exchange Administrator page, click Browse. Select the new user that you have created, and then select Exchange Recipient Administrator role.
5. Click Add.
6. On the Completion page, click Finish.

For Microsoft Exchange Server 2010, complete the following steps to grant recipient administrator rights to the user:

1. Click Start > Programs > Microsoft Exchange Server 2010 > Exchange Management Console. The Exchange Management Console window opens.
2. In the Console tree, click Toolbox.
3. In the Work pane, double-click the Role Based Access Control (RBAC) User Editor tool. The Exchange Control Panel window opens.
4. Enter the user credentials for the account with permissions to open the user editor in the Exchange Control Panel. Click Sign in.
5. Click the Administrator Roles tab.
6. Select the Recipient Management role group, and then click Details.
7. In the Members area, click Add.
8. Select the user that you want to add to the role group, and then click OK.
9. Click Save to save the changes to the role group.
   
   source: http://publib.boulder.ibm.com/infocenter/tivihelp/v24r1/index.jsp?topic=%2Fcom.ibm.itcamms.doc_6.3%2Fexchange%2Fassign_admin_rights.html