ISA 2006: Hotfix 520 is out
The Feb 22, 2010 update for ISA Server 2006 is the current high-watermark hotfix level:
https://support.microsoft.com/default.aspx?scid=kb;EN-US;980067
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The Feb 22, 2010 update for ISA Server 2006 is the current high-watermark hotfix level:
https://support.microsoft.com/default.aspx?scid=kb;EN-US;980067