My company is located in NY. We run a Windows 2000 Active Direct
environment. We also have a small six person office in Colorado. It has been
setup with point-to-point firewall VPN connection, so user are authenticated
here in NY.

Now, the CO office wants to expand to a new location and expand to 30
employees. We were thinking of setting up a separate domain there, rather
than have users go through us here in NY for everything.

How would I set this network up so that users are on their own domain, yet
use the same email addresses that they use now? Don't forget, they
authenticate through the NY domain right now.

Thank you.