Many ISA firewall admins who are currently running ISA Server 2000 or 2004 will want to know why they should upgrade to ISA Server 2006. While the upgrade from ISA Server 2000 to ISA 2004 was an easy one to understand because of the major improvements and changes made between ISA Server 2000 and ISA 2004, the changes included with ISA 2006 versus ISA 2004 are more incremental and provide a much smoother transition than the upgrade from 2000 to 2004.
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