having dificulties to move (local move request) legacy mailboxes from exchange 2003 to brand new exchange 2010 server during migration.
I was only able to move the administrator mailbox from the old exchange 2003 server to the new exchange server after modification; adding administrator (domain admin) account on the manage full access permissions from the mailbox.
When trying to move other user mailboxes i recieve the error
Failed to communicate with the mailbox database.
MapiExceptionUnknownuser: Unable to open message store
MapiExceptionFailed: unable to communicate with the server
changing permissions does not work for other mailboxes.
need to solve this asap.