ISA Server 2004 was originally released with only a standard edition of the product. The
Enterprise edition debuted the following year, expanding upon ISA??™s capabilities even
further. Finally, predating the release of ISA Server 2006, Service Pack 2 for ISA Server 2004
added many of the same pieces of functionality recently included in ISA Server 2006, such
as HTTP compression support, DiffServ, and other enhancements.
17 Exploring ISA Server 2006??™s New Features
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Expanding on ISA Server 2004??™s Success with ISA Server 2006
Microsoft released the next interim build of ISA Server 2004 as a new generation and relabeled
it as ISA Server 2006. This version is similar in many ways to ISA Server 2004, with
specific enhancements made to several key areas. In a way, it really can be thought of as
ISA Server 2004 Service Pack 3, but instead it has been relabeled. The learning curve
between ISA 2004 and ISA 2006 is not steep, however, and administrators familiar with
ISA 2004 will immediately be familiar with the 2006 model. That said, the evolution of
the ISA Server 2006 product to the spot that it inhabits today is impressive.
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