Submitted by PhilEddies on Fri, 07/23/2010 - 11:17administrator | 4563 points
By default when a new user is created in Active Directory the object will be created under the top level User container (CN=User), similarly when a computer is created it will be created in the top level Computers container (CN=Computers).
If you would like to change this behaviour then this is how.
Note: Your domain functional level must be at at least Windows Server 2003'
First create your desired Organisational Units for both Users and Computers.