AD permission to unlock user account

How To Delegate the Unlock Account Right to a group or user:

1. Create the group or user account that you want to have the right to unlock user accounts in Active Directory Users and Computers (for example, Help Desk Admins).
2. Right-click the domain (yourdomain.com) in Active Directory Users and Computers, and then click Delegate Control from the menu that is displayed.
3. The Delegation of Control Wizard should be displayed. On the Welcome dialog box, click Next.
4. On the Users and Groups dialog box, click Add. Select the group in the list that you want to give the right to unlock accounts, and then click OK. On the Users and Groups dialog box, click Next.
5. On the Tasks to Delegate dialog box, click Create a custom task to delegate, and then click Next.
6. On the Active Directory Object Type dialog box, click Only the following objects in the folder:. In the list, click User objects (the last entry in the list), and then click Next.
7. On the Permissions dialog box, click to clear the General check box, and then click to select the Property-specific check box. In the Permissions list, click to select the Read lockoutTime check box, click to select the Write lockoutTime check box, and then click Next. (you can also select other relevant permissions like for ex "read accountexpires" which may help the help desk officer to inform the locked out user about the account expiry time and advise them to action it asap)
8. On the Completing the Delegation of Control Wizard dialog box, click Finish.