Root / Child Windows 2003 SP1 Exchange 2003 Permission Problem -- What permission is my account missing?

I have a root and child domain (root.company.com and
child.company.com). Both root and child servers are running Windows
2003 SP1. I created a user account in the Root domain called
"ROOT\SuperAdministrator". This user account a member of:

- Administrators
- Domain Admins
- Domain Users
- Enterprise Admins
- Exchange Domain Servers
- Exchange Enterprise Servers
- Schema Admins

Exchange 2003 is installed on a Windows 2003 SP1 box in the child
domain. Using Exchange System Mananger, we delegated control so that
"ROOT\SuperAdministrator" is a "Full Exchange Administrator".

The user ROOT\SuperAdministrator has also been added to the local
Administrators group on the Exchange server (which is a member server).

Here's my problem. If I log onto the domain controller in the CHILD
domain, and log on with the credentials of my ROOT\SuperAdministrator
account, I am unable to modify the email addresses of existing user
accounts. I get an Access Denied error. (These existing user accounts
are accounts in the CHILD domain).

If I log onto the Exchange server as ROOT\SuperAdministrator account, I
can successfully modify the email addresses of existing users.

I have been having problems with this for monthes. There have been
knowledge base articles posted, and removed. I have goten support from
Microsoft by phone. Im now stuck. For extra back ground information,
here are some old posts of mine about this topic:
http://tinyurl.com/lgchw

Does anyone know what my permission problem might be, or where I should
start looking?

.

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