Hello to everybody I have plan to do the Migration from Exchange 5.5 to Exchange 2003. is there any one can help me how to go abot it My existing setup is as follows I have 7 sites connected to the Bridge head server. All are connected with x.400 connecters. All the 7 sites are in different Child Domain The Bridgehead server is in root Domain. Currently all the mail server were configured in Windows 2000 server with Exchange 5.5 /Sp#4 Can any one of you can give me a brief Idea to where to start and procedure Your help will be highly appreciated With regards Siva.....