Download ISA Server 2006 Beta 1 Trial Software
To receive the free trial software of ISA Server 2006 Beta 1, click the link below for the desired edition. This link will take you to the ISA Server 2006 Beta registration form. After you submit the form, you will receive a link to the download location as well as links to other helpful resources.

ISA Server 2006 Beta 1 - Enterprise Edition
http://www.microsoft.com/downloads/details.aspx?FamilyId=D45AA23C-296B-4BE2-87A1-41400BB85FEB&displaylang=en
 
ISA Server 2006 Beta 1 - Standard Edition
http://www.microsoft.com/downloads/details.aspx?FamilyId=F81EEADD-3847-49C9-9625-6E6C6444A0CF&displaylang=en
 
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