I really need help grasping this concept.
I need to move users from one forest to another, and one exchange server to another, so CrossOrg. I want all users in each Org to send/receive email for the same external domain. They also need to be able to talk to each other internally and look up names in the GAL. I want to do 1 department at a time. I need the steps to achieve this.
I have already created the trusts and built the new Exchange 2007 server. The old Exchange server is 2003.
I also used ADMT 3.1 to copy users to the new forest.
I have figured out how to move the mailboxes with EMS.
Now, I want to be able to disable the old mailboxes (2003) and keep everyone communicating in each forest/org.
I have read numerous articles but I'm getting confused.
I need specifics of what to do on each server.
ForestA Exchange 2003 (Will be decommissioned)
ForestB Exchange 2007
Both need to send/receive same external domain. Internally, users need to be able to communicate with each other cross org until the transition is complete.
What connectors? What recipient policies?, etc...