ISA2004 and Macintosh Computers
Eriq Neale has written a couple of nice blog entries recently on issues involved in connecting MAC's through ISA2004.
Instructions on how to allow Macintosh computers to work through ISA2004 as securenat clients. A securenat client is a non-Windows operating system client computer that wishes to access the Internet while not having ISA 2004 act as a Proxy for them.
Internet Access for Macintoshes behind ISA 2004
Comment: I'd prefer that the Macintosh computers be configured as Web Proxy Clients and use a browser that supports proxy settings. Any other apps on the Mac that do not support proxy can be handled as any non-authenticating application.
How to Publish Timbuktu to one Internal Client:
Publishing Timbuktu through ISA 2004