For very large user bases that span multiple domains and, in some cases, forests, the following configuration is supported. The following example depicts a possible configuration running a particular version of Windows Server and component software such as Microsoft Office. For a complete list of the supported versions of these components, see the topics under System Requirements and Required Components, in this guide.

Multi-forest and multi-domain Active Directory topology

System Requirements and Required Components

Forest A: Parent Domain

• Computer 1: Running on Windows Server 2008, Windows Server 2003, or Windows 2000 Server as a functioning domain controller.
• Computer 2: Running on Windows Server 2008, Windows Server 2003, or Windows 2000 Server as a secondary domain controller.
• Computer 3: Running Windows Server 2008 R2 with a Full Server installation of Microsoft Dynamics CRM.
• Computer 4: Running Windows Server 2008 R2 with an instance of SQL Server 2008.
• Computer 5: Running Windows Server 2008 R2 with an instance of Microsoft SQL Server 2008 Reporting Services.
• Computer 6: Running on Windows Server 2008 or Windows Server 2003, with Exchange Server.

Forest A: Child Domain

• Computer 7: Running on Windows Server 2008, Windows Server 2003, or Windows 2000 Server as a functioning domain controller.
• Computer 8: Running on Windows Server 2008, Windows Server 2003, or Windows 2000 Server as a secondary domain controller.
• Computer 9: Running on Windows Server 2008 or Windows Server 2003 with an instance of Exchange Server.
• Computer 10: Running Windows Server 2008 or Windows 7 with the E-mail Router.

Forest B: Parent Domain

• Computer 11: Running on Windows Server 2008, Windows Server 2003, or Windows 2000 Server as a functioning domain controller.
• Computer 12: Running on Windows Server 2008, Windows Server 2003, or Windows 2000 Server as a secondary domain controller.
• Computer 13: Running on Windows Server 2008 or Windows Server 2003 with an installation of Exchange Server.