Did you open Outlook Express and then import all the .dbx folders from the Clickfree backup drive?
Open Windows Explorer then Tools>Folder Options>View Tab. Select show hidden files and folders, Untick Hide File extensions of known type and Untick Hide protected operating system files. Or you won't be able to see them.
In XP they are usually in .dbx folders in Documents and settings>yourname>Local settings>application data>identities>[long folder name of numbers symbols and letters > Microsoft> Outlook Express
Outlook Express > Tools > Options > Maintenance tab and click on 'Store Folder' button (this will tell you where OE is currently storing your email that is in the folders displayed when you are using OE)