Dear Friends, I have a scenario for you. I have 2 site named Site A and Site B On Site A I have the following servers:- Srv1 --> Having ISA, Exchange 5.5 (Mailbox & OWA, mainly used as SMTP), IIS, acting as domain controller Srv2 --> Having Domain controller (Master) Srv4 --> Having windows 2000 and Exchange 5.5 IMC (All in coming mails & Archiving) Site B:- Srv5 --> Windows 2000 Replica Domain controller for site A, Exchange 5.5 server- member of same site as of Site A. Solution required:- We need to install a new Server on Site A which will be exchange 2000 server. This server has to be a member server to existing domain and will maintain user's mailbox but has to act as a backend server for Srv1 in Site A If I use Microsoft Swing method to move the mailboxes. What will be the effect on existing exchange servers? Will Srv1 act as a front end server? If not, how can I configure the existing exchange 5.5 to act as a front end server for the newly installed exchange 2000 server? Regards, Rajnish Malik