Microsoft Exchange 2000 Infrastructure Design: Co-existence, Migration, and Connectivity

The Active Directory Connector (ADC) is one of the most powerful tools available to the messaging consultant. You already know that Exchange 2000 doesn't have its own built-in directory service but instead uses the Active Directory. During a migration project from Exchange 5.5 to Exchange 2000, one of the most important aspects of coexistence is that of synchronizing directory information between the Exchange 5.5 Directory Service and the Windows 2000 Active Directory. The ADC does just that: It maps the Exchange 5.5 Directory Service object to corresponding objects in the Active Directory and vice versa.
In this chapter, we'll explore some of the ADC's dark secrets and, hopefully, by the time you've read about ADC, you'll be prepared to give it the respect it deserves when you go to deploy it.
There are many aspects of the ADC's operation that merit broad and comprehensive discussion. In the simplest of cases you can look at its operation in the simplest of environments. In such a case, you need to be concerned with how the ADC takes information from the Exchange 5.5 Directory Service and synchronizes it into the Active Directory. Of course, in this simple case, you must also be concerned with the reciprocal process how the ADC synchronizes information from Active Directory into Exchange 5.5 Directory Service.
This defines the basic behavior of the ADC, and, while it appears reasonably straightforward, there is a lot of work taking place under the covers to make...