With the help of Heath at HRSoftworks(.net), he got Authoxy working for me. We Mac users are now nearly 100% full citizens on our MS network. I can do everything including software update, access network drives, iTunes music store, iTunes radio, Live365, MS Office Update (and other software updates), etc. etc.
Can't do MaxiBidder (colourfull.com) for some reason. It doesn't work. Some other things don't work, like Skype, but that's not surprising because I think some of those special ports are not open to anyone here.
I am a happy camper. I've used Authoxy for about 4 weeks now hard, and it just works. There is an issue with startAuthoxy (startup items) that doesn't seem to be working right but I bet we get it working.