External access to our internal Intranet

Well that depends on a couple things. If the users are connecting to your network via a vpn and its a matter of making sure they are able to resolve the name of the web server. What we did is put our web server in its own dmz of our firewall and the only traffic we allowed is http and https to that machine. This way the only traffice allowed was those respective ports.

Hello there,

Do you want the users to connect to your Internal Network using a W2K with IIS?, Are you sure of it?
What I would do is have another machine not running IIS (for security reasons of course) then have this machine with 2 NICs (Network Cards) one going out to Internet and anther one connecting to your Internal Network.
You don't mention what do you want the users to do on your network if only ftp, telnet, I don't know, but I would configure the firewall to only accept the protocol you need and only that one, make sure that the client proper authenticates on your (domain/network) and go from there.
You can also do this on your IIs Machine, but I just don't trust IIS.
Anyway, let me know if this helps, if not I will be glad to help you with some more ideas.

Regards,
@lberto

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