Try searching for ‘backup’ in outlook express help. It tells you how to backup these files. The files you need to backup have extensions *.dbx (i.e. Inbox,dbx, Send.dbx, etc). They can be copied to a CD or other backup media.
These files are usually found in the folder:
C:\Documents and Settings\user\Local Settings\Application Data\Identities\{0B686587-3426-42EE-BD21-A0C8AD4EC085}\Microsoft\Outlook Express
Alternatively, search for files with extension ‘dbx’. You will need to select ‘search in hidden files and folder’ in your search (advanced) options.
Regards,
gtsim