Sometimes the migrator seems to get stuck during initialiazation. Cancelling the process with Ctrl-C and restarting it resolves the issue.

It has been reported that the migrator seems to get stuck in the middle of the migration process. This issue has not been verified by Zarafa, but if it occurs, the migrator can be interrupted with Ctrl-C. Restarting the migrator will cause it to continue where it left off.