I have an AD native domain with 4 DCs. I have recently purchased a new server to replace one of the 2000 DC. During the AD install on the 2003 server I get the message that my 9x/NT clients will not be able to authenticate to this server. The server was scheduled to be installed in a site that has one other DC in it. I have the Directory Services patch installed on all 9x/NT machines. Will my 9x/NT machines be able to continue to log on to the domain without problem as they do now? I asume they will but want to be sure before I implement the new server. Sadly I do not have a test environment to try this out in first. The server will also server for some file storage as well.