Question : Failed to copy messages to the destination mailbox store with error

I am having a couple different issues that may or may not be related. I need to restore a user's deleted items folder from an exchange backup file. I created the RSG and am experimenting with the restore-mailbox cmdlet but experiencing problems.

If I run the following command:
restore-mailbox -RSGMailbox 'user' -RSGDatabase 'Recovery Storage Group
\Mailbox Database' -id 'Administrator' -TargetFolder 'Backup' -
StartDate '08/01/07' -EndDate '08/05/07'

It creates the Backup folder in Administrator's mailbox and begins copying over email with an enddate of 8/5. But, the start date is not adhered to and it continues on to copy over email from any start date.

If I let it run until completion, with or without start/end data parameters I get the following error:

[3/4/2008 9:51:16 AM] [0] [ERROR] Error was found for Administrator ([email protected]) because: Error occurred in the step: Moving messages. Failed to copy messages to the destination mailbox store with error: An unknown error has occurred., error code: -1056749164

And then the Backup folder is deleted from administrator's mailbox because there was an error, so I cannot copy out what I need, which is just the deleted items folder for 8/1/ through 12/31.

So, what does that error mean, how can I perhaps ignore errors and keep whatever is restored, and what am I doing wrong with the startdate?

The other problem is that this mailbox is 10GB so everytime I try this restore this the database increases by 10GB and then becomes unused space when the folder is deleted because of the error. Can I regain that space using eseutil?

Answer : Failed to copy messages to the destination mailbox store with error

After talking with Microsoft they are just thinking its a corrupt RSG. No helpful information on this at all was found anywhere. Thanks...