I have two separate forests: one running e2k3 sp2 and one e2k7sp1 and I need to move the domain space from one organization to the other e2k3->e2k7.Given that downtime is an issue I am looking for ways not to move the whole domain at one go and I came accross "How to Configure Exchange 2007 to Route Messages for a Shared Address Space"(http://technet.microsoft.com/en-us/library/bb676395(EXCHG.80).aspx), which seems a way to do it, but I think it is a method when both organizations are running e2k7 - correct me if I am wrong!?Has anyone used thos method? Do I have any other options?Thanks G

Hi, In fact, that way can also be applied to the Exchange 2003. No restriction on the version of Exchange. Thanks Allen