I have 3 Active Directorys that are migrating to one common. Each has 1 exchange with a corresponding domain and we have thought of putting 1 exchange with the 3 domains. The current version we have is Exchange 2003 STD SP2.One of them, like this in the domain we must not do anything, but other questions arise me:1 .- How to migrate the 2 exchange at current exchange?2 .- How to configure the 3 domains in exchange 2003 STD?3 .- When you budget, make an Exchange 2003 or Exchange 2007 EE EE to have high availability. Until then, I recommend for the server if you fall you can lift another at the time that this duplicate?THANKS

Hi,You can use the mailbox migration wizard (or exmerge) to migrate the mailboxes to the new domain.If you point the domain MX records to new new domain and make sure the the domain names are included in a recipient policy the exchange server will accept mails for all 3 domains.Leif

You can try a cross forest move mailbox after you move the ad accounts to one common server.Ref to: http://msexchangeteam.com/archive/2006/11/02/430289.aspx, which applies to exchange server 2003 as well.- Nagesh