I wanted to specifically call out a white paper that Cathy mentioned in her February Documentation Update:

White Paper: Configuring Virtual Organizations and Address List Segregation in Exchange 2007

Over time, there have been several versions of documentation on this subject (created by both Microsoft and others) and that we have seen followed, with more or less success. I am very glad that this paper is completed. Dave Goldman announced that it was coming and talked about people that worked on it. Indeed, it is now here!

Source:→ Exchange Team Blog

Exchange Server 2007, Exchange 2007, Virutal, Organization, Address, Configuration, Documentation