Core services that must be enabled for your ISA Server 2004 computer to function correctly: http://support.microsoft.com/?scid=kb;en-us;888649&spid=2108&sid=global
Microsoft ISA Server 2000 Enterprise Edition installation and deployment guide: http://www.microsoft.com/technet/prodtechnol/isa/2000/deploy/isaentin.mspx
An update is available to prevent Configuration Storage server account settings from expiring when you use certificate authentication in ISA Server 2004 Enterprise Edition: http://support.microsoft.com/default.aspx?scid=kb;en-us;894609
Upgrading to Microsoft ISA Server 2004 Enterprise Edition: http://www.microsoft.com/technet/prodtechnol/isa/2004/isa2kexport.mspx