Mailboxes will not switch, permissions confirmed correct, and connectivity in place.
The following error can be found in the Mail Source Agent log during auto switching attempt, or EMWMigration.log during manual mailbox switching attempt
"MMExCore|Quest.MigrationManager.Exchange.Informer.informer_WriteLogError Error: 0 - (Source: CMBRedir::MakeRedirector| Number: -369098598 - Error 0xea00009a. Exchange server not found, directory server: "FQDN Domain Name", store: ""
Note the lack of a store name
Root cause not known, something wrong with the MBRedir.dll on the console and the Source Agent host
Apply the newest, available, cumulative, update for Migration Manager from www.quest.com/support to all servers involved.