Migrating Outlook Express files to new pc

A friend is using Outlook Express on a really old machine (Win98; yeah, really) and plans to move to a new machine running Win7. How do I migrate their Outlook Express e-mails onto the new machine?
 
Thank you so much Diane! You're right; fairly easy and very straight-forward following the very user-friendly steps in the link you included. Thanks again!
 
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