I had to wait for months to get a solution on this one. Today should be the day the fix is delivered trough 10.0.3 CH2.
What happened: I'm moving site-by-site mailboxes using the Move Archive wizard but interrupting the wizard was no option so moving BIG mailboxes which takes more then 24 hours was not possible because interruptions done casued by the backup-schedule. We've receive "the stub received bad data" if the job wants to continue the move but from that point on there was no way to hook again into the pending move. Only one option, delete the remote (new) archive and start all over again. But if you have to move 3000+ mailboxes and you choose to disturb your customers as less as possible you have to ask Symantec for a fix. Let's hope it will be fixed. I'll post my congratulations to the development team here if they fixed it and will place a link to the E-track.
Erik.