Move from Exchange 2003 to 2007 leaves remnants on Exchange 03

Hello, I am in the process of moving mailboxes from an Exchange 2003 to Exchange 2007 server. I am doing this from the Exchange 2007 server. The strange thing is that when I go back to the Ex2003 server and look where the mailboxes were stored, some of the mailboxes moved completely and deleted themselves, others... the username is still there but it says for "size" 0 bytes and "items" 0 items. So it's like everything moved and it has left an empty shell. The move process on the Ex2007 side said that everything completed successfully.

What causes this and more importantly, how do I get rid of them from the Ex2003 server so that I can gracefully remove Ex03 from the domain? Thanks
XceedITAsked:
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v_9mhdrfCommented:
Right click on the mailboxes and click on purge so that the empty mailboxes will be purged. And make the retention period for mailbox 0 days, so that the purged mailboxes will be removed immidiately.
To do this, right click on Mailbox store and click on Limits tab and change the retention period.
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v_9mhdrfCommented:
Please follow this articles as well, which has step by step resolutions with images to remove the Exchange 2003 from the environment.

http://technet.microsoft.com/en-us/library/bb288905(EXCHG.80).aspx
http://www.petri.co.il/cleaning-up-exchange-2003-remnants.htm
http://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010---part-ii/

Check out and revert back  if you have any issues.

Hope this helps!
Thanks,
Mohammed
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XceedITAuthor Commented:
Hi v_9mhdrf, I can not decommission the Ex2003 server until I remove the empty shell mailboxes that were left on the old server. Ex2003 still sees that it has active mailboxes eventhough they are empty. Any ideas on how to get rid of them?
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