We migrated about a year ago with the GroupWise migration tool. The results were pretty poor and if we'd had it to do over we would have used imapsync and ical exports. We had to do migrations one by one to get anywhere close to successful results with the Migration tool.
Check with Zimbra support and they may be able to give you some tips to improve your results. Migrate with just one thread and initially just one mailbox and see if that's working. Run integrity checks against your GW mailstore to make sure that their aren't issues there. Make sure you set the option for maximum attachment size to migrate.
Good luck. |