I heard about not bad application-
repair dbx file, supports files of the .dbx format for
Outlook Express versions 5, 5.5 and 6, repair dbx files of Outlook Express in the batch mode, recovers information from *.dbx files up to 4GB in size, repair corrupted *.dbx files of Outlook Express greater than 2 GB in size, the dbx repair tool recovers attached files.