Exchange 2003 to Exchange 2010 cross forest Migration

Hi all,

im doing cross forest migration from 2003 to 2010 Exchange im using Prepare-MoveRequest and ADMT 3.2 i used Prepare-MoveRequest first then ADMT but for some users after migrating them the Email attributes are not set so they are not appear in the GAL or have email address and i can't run Prepare-MoveRequest again when i run it i got the following error

C:\Program Files\Microsoft\Exchange Server\v14\Scripts\Prepare-MoveRequest.ps1 : Cannot create mail enabled user becaus
e an existing object with type  already has the same proxy addresses/MasterAccountSid.

so what can i do to add the exchange attributes to the user

Note : i didn't migrate his mailbox yet

Thanks