Use files and transfer settings wizard, hit start, programs, accessories, system tools, then files and settings transfer, hit next, select 'old computer', then next (wait a few moments) select other (such as usb drive, external disk, zip disk partition) next, select files and settings then check 'let me select custom list of files' etc, then next then remove everything on the right hand list except 'Outlook Express' then next, it will then save the image to where you selected earlier.
When restoring, you select new computer then go through restoring.
When you open outlook express after restoration to new install, you will see all your names (email names) no folders, click on each name, you are asked if you wish to download folders, select yes and it should also prompt for password.
Thats how I do it for friends and relatives, stopped them from spending $30 on some program that does just what I wrote but worse.