Authenticate to Windows NT Domain?

Hello, I administer a Mac OS X (10.2.6) server on a 933 Mhz Quicksilver machine. We have a mixed Mac/PC environment where all users store files on the OSX server. We are on a WAN with connectivity provided from our corporate parent in another city. When logging on, the Windows users authenticate to a Windows NT domain. I have the usernames exactly the same on the OSX Server so they can access it. When the usernames and passwords are the same on both the NT domain and OSX Server, the Windows users can access everything seamlessly. Problem comes in when the Windows users are forced to change their passwords by the NT domain. Once they do that, they can't access the OSX server without being stopped by a password dialog. Can someone describe how I can get the OSX Server to look for passwords on the NT domain for authentication?