This section describes how to move all the mailboxes on Server A to Server B.
Note You can move mailboxes to another server in a site by choosing Move Mailbox from the Tools menu in the Microsoft Exchange Server Administrator program. However, this only enables you to move the mailboxes to the Recipients container. If this is acceptable, then using the Move Mailbox command is the easiest way to move mailboxes.
To keep the mailboxes in the same containers or subcontainers as they were on Server A
Stop the Information Store service on Server B. In Control Panel, double-click the Services icon. Under the Service list, select Microsoft Exchange Information Store, and then choose Stop.
In the Exchsrvr\Mdbdata directory on Server B, create a subdirectory called Bak.
Move all files from the Exchsrvr\Mbddata directory in Server B to the Bak directory.
Copy the Pub.edb file from the Bak directory to the Mbddata directory.
Before proceeding to the next step, make sure that you completed a backup of the Exchsrvr directory on Server A. This backup should be completed after all services are stopped. Also, verify that you have successfully created the Mailbox-ServerB.csv file.
Start all of the Microsoft Exchange services on Server A.