Error moving a user mailbox from Exchange 2003 to 2010

hi

 I have moved all my users from Exchange 2003 to Exchange 2010 but I am getting the following error when I try to move.
Please see screen shot
MoveMailboxError.png
CBBNet AdminAsked:
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DLeaverConnect With a Mentor Commented:
It would indicate that you have an @ in the users alias, alternatively any other special character that it doesn't like.

If you change the users alias in Exchange 2003 and try moving again
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AkhaterCommented:
the problem is that the user doesn't have a UPN set, open AD users and computers -> find the user and open it > go to the account tab and you will notice that the UPN (Drop down list) is empty. use the drop down to select a UPN suffix it will fix it
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CBBNet AdminAuthor Commented:
Thanks the alias was where the problem was.
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