Where Not to Install

ISA Server 2004 Enterprise Edition and the CSS can only be installed on the Microsoft Windows Server 2003 operating systems.

Note 

The Message Screener, firewall client share, and ISA Management console can be installed on a Microsoft Windows 2000 server.

Although it is possible to install the CSS on a domain controller, we advise against it, as we discuss in the "Where Not to Install ISA Server" section in Chapter 2.