Hi,
1 Please make sure using an Exchange full Administrator account.
2 Get into adsiedit (support tools form server cd) and under the domain configuration container, you'll see excange and first administrative group. Somewhere under there, you'll need to find whether there's deny permission and undo it.
The following is the tree where you will find what you are looking for:
1. Install Support Tools from Windows 2003 CD 1
2. Click Start > Run > type ADSIEDIT.MSC > click OK
3. Navigate to the following:
Configuration (Domain) \ Cn=Configuration,DC=xxxxxxx,DC=com \ CN=Services\CN=Microsoft Exchange
Rowen
TechNet Community Support
