Well. The Users and Computers containers are not the same as an
organizational unit (OU). The only reason for having them is because of a
backward comp ability with a legacy API and to have a place to put users and
computers during an in place upgrade of an NT 4.0 Domain to Windows 2000 AD
or Windows Server 2003 AD. These containers aren't mean for any other usage.
New computer accounts that are joined to the particular domain are ending up
within the computers container, but that isn't a perferd locations since
containers can't have Group Policies linked/applied and the next level to
define policies is the domain root. This can be changed if running Windows
Server 2003 Domain Functional Level. (See
http://support.microsoft.com/kb/324949)
Using other tools like ADSIEdit or bind to the directory with what ever you
want makes the possibility to create other objects within the users and
computers containers, like another child container, how ever not an
Organizational Unit. That is because it's not an allowed child object of the
class "containers" within the Active Directory default schema. This can be
changed how ever, but I don't recommend it as long there is no really good
reason for doing so. The way to go in that case is to modify the
possibleSuperior attribute that contains a list of allowed classes as a
child object of the particular class.
--
Regards
Christoffer Andersson
Executive Consultant - TrueSec
Microsoft MVP - Directory Services