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

This white paper provides the information that you need in order to configure Microsoft Exchange Server 2007 with multiple address lists so different groups of users can have their own address list and secure those address lists so that groups of users can only see their specific address list.

Much of the information in this white paper originally appeared as individual Help topics in the Exchange Server 2007 Help. In this white paper, we have consolidated the information that you need to deploy and manage segregated address lists in one central location. We have also provided sample scripts, which can be modified to fit your environment, to help automate the provisioning of virtual organizations and users.

http://technet.microsoft.com/en-us/exchange/bb936719.aspx

Update:

White paper author, Dave Goldman, just posted some updates related to document:

http://blogs.msdn.com/dgoldman/archive/2008/02/17/exchange-2007-address-list-segregation-document-updates.aspx