ScanDBX for Outlook Express 

ScanDBX is a fully automatic tool designed to repair damaged Outlook Express files and installations in place, without requiring you to understand where or how Outlook Express stores its data. Microsoft Certified Application and Certified Partner.
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Citisoft Outlook Express Backup 

Citisoft Outlook Express Backup is an easy to use tool for backing up and restoring the popular Microsoft Outlook Express mail client. It allows you to backup and restore the following data: - Mail messages - Address book (WAB files) - Mail rules
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Tinynice MailKeeper 

MailKeeper is a handy tool to backup and restore your Outlook Express accounts, emails, news messages, message rules, blocked senders list and settings.
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