New Local Move Request Failed

I am trying to move mailboxes from SBS 2003 to our new Windows 2008 Exchange 2010 box and most moves have completed without issues.  However, there are two that have the error below when trying to create the local move request.  I am not sure how to resolve this problem.  Can anyone tell me how to get around this problem and how to increase the target quota so this error does not happen?

Summary: 1 item(s). 0 succeeded, 1 failed.
Elapsed time: 00:00:01

Joe Bloggs

Mailbox size 3.711 GB (3,984,900,786 bytes) exceeds target quota 2.3 GB (2,469,396,480 bytes).

Exchange Management Shell command attempted:
'mydomain.local/MyBusiness/MyCompany/SBSUsers/Joe Bloggs' | New-MoveRequest -TargetDatabase 'Mailbox Database 1034874542'

Elapsed Time: 00:00:01

I also have a couple of stub mailboxes left on the SBS 2003 Exchange server which didn’t seem to clear completely when other mailboxes were moved.  How can I clear these out and does it matter if I don’t?
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Jamie McKillopIT ManagerCommented:

You need to configure the mailbox size quota on your databases -

jongrewAuthor Commented:
Thanks - that worked.  What about the last part of my question re stubs
Jamie McKillopIT ManagerCommented:
Run the cleanup agent on the stores by expanding the store, right-click on Mailboxes and selecting Run Cleanup Agent. The mailbox should then appear as disconnected and you can purge them. If that doesn't work, try moving the mailbox back from the 2010 server. The move will fail but it will allow you to run the cleanup agent successfully.

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jongrewAuthor Commented:
The moving of the mailboxes back to the SBS 2003 from Exchange 2010 did not fail so now its back where it started from
Jamie McKillopIT ManagerCommented:
Move it back to the Exchange 2010 server. Let me know if the problem happens again.

jongrewAuthor Commented:
I sorted this out myself now using the method below and they were all deleted within a few minutes but thanks for your input.

Start Exchange System Manager.
Locate and then click the mailbox store that you want. For example, to locate the Mailbox Store (My_Server) store, follow these steps:
Expand Administrative Groups, expand First Administrative Group, expand Servers, and then expand My_Server.
Expand First Storage Group, and then click Mailbox Store (My_Server).
On the Action menu, click Properties, and then click the Limits tab.
Under Deletion settings, type a number that is less than the age of the orphaned mailbox in the Keep deleted mailboxes for (days) box. For a mailbox that is newly orphaned, type 0 (zero).
Configure the maintenance schedule. To do this, follow these steps:
Click the Database tab.
In the Maintenance interval box, click Use custom schedule, and then click Customize.
In the list of days, click the current day so that the row for that day is highlighted. This schedules the maintenance for all day.

Note The scheduling of maintenance for all day can be set or removed. To do this, click a day in the list of days.
Click OK.
Exit Exchange System Manager.
Allow for online maintenance to finish. This may take several hours. You will see event ID 1221 logged in the Application log when online maintenance is finished.
In Exchange System Manager, use the Run Cleanup Agent on the Mailboxes folder that contains the orphaned mailbox.

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