I have demonstrated how to built inter-forest trust relationship and migration of user and computer account in previous posts. This post shows how to create an exchange connector from exchange 2003 sp 2 (assume one server has all the roles) to exchange 2010 sp1 cluster severs (DAG). 2 x mailbox servers and 2 x hub/cas server, so that email can exchange in any direction. This is crucial for progressive migration where some users are in the old exchange server waiting to be migrated and some users has been migrated to new server. For sender it is transparent.
From old exchange 2003 sever:
From new exchange 2010 server:
Following power shell command to move mailbox from legacy server (exchange 2003) to exchange 2010. Enter following command from exchange 2010 exchange management shell.
(enter old server username and password that you have created earlier with appropriate permissions. eg oldomain\administrator)
[PS] C:\Windows\system32>New-MoveRequest -Identity email@example.com -RemoteLegacy -TargetDatabase EXCH_DB -RemoteGlobalCatalog ‘olddc.olddomain.com’ -RemoteCredential $RemoteCredentials -TargetDeliveryDomain newdomain.com