Hi I am sure this has already been discussed here. Can someone be patient enough to throw some light on this . I already have an Exchange 55 org with 18 sites. All the sites participate in Dir Repl most of them through the smtp connection. Now I have a Exchange 2000 server with the same org name. I want to make this participate in the replication. Both the NT and the 2000 domains are not trusted. They have to be connected through smtp only. What are the steps that I need to take on both the 5.5 side and the 2000 side to make this work ? Thanks Ganesh