The problem here is that i'm not all that clever in using ISA 2000. I administer other servers running ISA 2004 and I managed to get Skype working without a problem.
I know that Skype needs all outgoing ports to be opened. I thought that i'd done that. I've created a Packet Filter which allowsoutbound traffic on all TCP ports.
It doesn't work. So what should I have done?