Internet Security and Acceleration (ISA) Server 2004 SP3 provides the latest updates to ISA Server 2004, with increased security, new troubleshooting tools, and improved log viewer functionality. This service pack also adds support for publishing Microsoft Exchange Server 2007 with ISA Server 2004. We strongly recommend customers install ISA Server 2004 SP3 on all computers running ISA Server 2004.
Release Date: May 1, 2007
Read about ISA 2004 SP3 here: