My company recently acquired another company and I want to find the best way to integrate the two domains; preferably without rebuilding either server.
Both sites have a Windows Server 2003 running Exchange Server 2003. I have yet to setup any sort of trust between them. The two sites are connected via IP over a site to site VPN.
At present ServerA in SiteA has a FQDN of servera.sitea.local and an email domain of sitea.com. The server in SiteB has a FQDN of serverb.siteb.local and an email domain of siteb.com
The first, and most important thing, is for all mailboxes in SiteB to have an email address ending sitea.com as well as siteb.com, with sitea.com being the primary email address.
After that I would like outgoing email from SiteA to flow from ServerA and outgoing email from SiteB to flow from ServerB.
Email between sites to flow inside the network and not go over the Internet.
The ability to move mailboxes between servers and the Global Address Lists updating automatically would be great too.
I would guess some or most of this would be achievable but I am not sure how to optimise the setup to work most efficiently.
Any help or advice would be greatly appreciated.