DBXtract
Click on the graphic to download:

PROGRAM FEATURES:
OE5 and OE6 have a proprietary binary format that makes archiving individual messages difficult. In addition, a number of people have indicated that their message folders have become corrupted and OE can not read them. Consequently, they have lost all the messages in that folder.

DBXtract.exe extracts all mail and news messages from individual dbx files. After extracting the messages one can drag them from a Windows Explorer folder into an Outlook Express mail folder.

NOTE!: There is no setup for this program.
Put the DBXtract.exe file where you wish and then make a shortcut.

Click on the graphic to go to Agent Ransack site.
How to search for .eml files in Agent Ransack:

PicoBackup Outlook Express Edition.
Click on the graphic to go to PicoBackup site:

Acubix PicoBackup Outlook Express Edition is an easy-to-use backup utility packed with many powerful features to make it extremely
simple to backup and restore your Microsoft Outlook Express emails.

This version of PicoBackup is FREEWARE. It will never expire. PicoBackup Outlook Express Edition is not a "lite" version of PicoBackup.
It has all the features and functionality of PicoBackup, apart from the fact that it can only backup Outlook Express emails.

Features:
Intuitive user interface makes it very easy to use
Automatically locates all Outlook Express users and the relevant files that needs to be backup
Integrated CD/DVD burning capability
(CD-R, CD-RW, DVD+/-R, DVD+/-RW, DVD-RAM)
Supports spanning multiple CD/DVDs
Strong 256-bit AES/Blowfish encryption
Backup to remote FTP server
Flexible integrated scheduling
Industry standard ZIP compression
Allows full or partial restoration from backup
Email notifications on backup
Comprehensive help system