I am having two servers istalled with exchange 5.5(NT) and Exchange 2000(W2k).2000 server is in a seperate subdomain of the NT server (a.com-->b.a.com).I want to establish a connection between the 2 servers and transfer mails between the users in both domain and the sub domain. W2k is with AD,domain controller and forestprep/domainprep installed. Please help me to solve this issue.(NT with SP 6 & W2k with sp 2) Thanks Manoj