http://www.ISAserver.org
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http://www.microsoft.com/downloads/thankyou.aspx?familyId=D22EC2B9-4CD3-4BB6-91EC-0829E5F84063&displayLang=en
ISA help and about says Microsoft ISA Server 2004 (c) 2004 Microsoft Corporation. Version: 4.0.2165.610
The version on a sample file says 4.0.2165.610
ISAInfo says 4.0.2165.594
Which is the the correct answer?