How to install the Active Directory Connector and Establish a Primary Connection Agreement Page 4
The next step is to establish a two-way trust relationship between the W2K and the NT domains. Create an account on the W2K server and make it a member of the Schema and Enterprise Admins groups. On the Ex 5.5 server you are establishing the ADC connection with, assign the same account you just created the Service Account Admin role at the organization, site and configuration containers. You will be using the account you created above for the ADC installation. When you install the ADC you must specify an account that has Service Account Administrator role in the Ex 5.5 environment. Otherwise, you will get errors. Note that if you get permission errors during the installation and you decide to make permission changes to the Ex 5.5 machine, you will need to restart the Ex 5.5 services (go to services and stop / start the Microsoft Exchange Server System Attendant) This will start and stop the other services. You are now ready to run the ADC installation. The setup program comes on the E2K CD in the ADC | I386 directory.
You will need to know which accounts you used to install the ADC. They will be important later when you establish your connection agreement(s).
Now the fun starts - establishing the first connection agreement
The connection agreement allows you to specify which recipient containers will be synchronized. This is specified in both directions when using a two-way connection. For example, you can synchronize the Ex 5.5 Recipients container with an Active Directory OU like "Exchange Mailboxes." You can specify this in the other direction - from the OU "Exchange Mailboxes" to the Ex 5.5 Recipients container.
Keep a copy of TechNet close by so you can easily solve any permissions issues. Below you will find a list of the Q articles for common errors.
Before installing the connection, I suggest printing out "A Guide for Upgrading from MS Exchange Server 5.5 to Exchange 2000 Server." It has screen shots of many of the settings, as well as references to additional Q articles when you are having trouble. It is a handy reference.