ISA 2006 – System Requirements:
– a personal computer with a 733-megahertz (MHz) or higher Pentium III-compatible CPU,
– Microsoft Windows Server??c 2003 operating system with Service Pack 1 (SP1),
– 512 megabytes (MB) of memory,
– 150 MB of available hard disk space, (this is exclusive of hard disk space you want to use for caching)
– one network adapter that is compatible with the computer’s operating system, for communication with the Internal network,
– an additional network adapter for each network connected to the ISA Server computer,
– one local hard disk partition that is formatted with the NTFS file system.

Warning: Do not install ISA Server 2006 Standard Edition on a multi-processor computer with more than four processors.