DBX files can be made accessible by importing it into Outlook Express and again accessing them. You can also recover it if you have the back up of original DBX files. Backup file is important as it is the last resort to get back lost files. For reliable solution, visit here Outlook Express Recovery software I hope this information would be helpful.

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>lets remove Security software and then check
>lets create new identity
http://support.microsoft.com/kb/209169

and then import the data back to new identity