Question:
How do I get multiple domains in Exchange 2000?
Answer:
I’m not sure what you mean by multiple domains in Exchange. Exchange 2000 allows you to have only a single Exchange Organization within your Active Directory forest, but you can have multiple administrative and routing “groups” (formerly known as “sites”).
You can have multiple NT domains within an Active Directory Tree and multiple Trees within the Forest, but to Exchange it’s all one big Organization (perhaps subdivided into groups) under Active Directory.