Existing EX16 CU9. Added second EX16 CU19 server to replace EX16 CU9 (currently offline) on same subnet and same AD. New CU19 is mostly configured for operation. How do i port users from old CU9 server to cu19 server. Am i to understand that i cant do a mailbox move? It seems that the CU9 server is the primary and mail is flowing through it. Sending from a test mailbox on CU19 gets stuck in the queue even though the send connectors are active and i can ping the destination relay. I've seen it suggested to create a DAG (which i have never had to do before) and seed the databases, and then make the new server the primary. I have no idea if this will work. Under the gun here to get mail back online asap.