How to Manage Exchange in Another Domain
You can use Active Directory Users and Computers to manage Exchange in more than one domain in a forest. This procedure outlines how to manage Exchange in another domain.
Before You Begin
If the Active Directory Users and Computers snap-in is installed on a computer that does not have Exchange or the Exchange management tools installed, you will not be able to perform Exchange tasks from that computer.
You start Active Directory Users and Computers from either an Exchange server or from a workstation that has the Exchange System Management Tools installed. For detailed information, see How to Open Active Directory Users and Computers.
Procedure
To manage Exchange in another domain
In Active Directory Users and Computers, right-click the root object in the console tree, and then select Connect to Domain.
Note
You must have the appropriate permissions for the target domain.