Question : Exchange 2003 to 2007 mailbox move problem

I am moving mailboxes (600) from a single Exchange 2003 server to a single Exchange 2007 server using the 2007 EMC Move Mailbox tool.  
I have a problem with two mailboxes. The move appears to have completed fine. However the mailbox still shows in the 2003 Mailbox Store with a little data in it (a few kb and 0 items). ADUC shows the accounts using the mailbox on the 2007 server. EMC shows them as User Mailboxes and the users are connecting.

How do I purge the mailboxes from the 2003 server? (Of course these two are in finance and very important!)

Answer : Exchange 2003 to 2007 mailbox move problem

You set both at 0 (zero) for both keep deleted items for days and mailboxes for days.    Also make sure you didn't have Do not permanently delete boxes checked.

Then apply then expand the Mailbox database then right click on Mailboxes then select Run Clean up Agent    

This has worked in the few instances in the past I have run into this issue.

http://support.microsoft.com/kb/930363