The sites are in different organisations. I want to maintain the current hardware/software setup and so keep the local users mailboxes on each exchange server. I want the new .com email feed to come in at the uk site, be validated against the local users and if not there be routed to the server in the states for delivery there.
Could this be done without merging the organisations by configuring a trust between the servers and configuring some kind of routing connector?
Would the only way my global address list give me all the uk and usa users is by merging organisations?