If you want to extract your emails, found in Microsoft Outlook dbx files into more versatile eml format to be accessed and viewed in test editors or email clients you can use this UnDBX, which is a command line utility. This eml format can be opened or imported in various email clients. The command to extract dbx files is undbx DBX-DIRECTORY OUTPUT-DIRECTORY. Therefore, the program will automatically extract the email messages of all dbx files in the selected directory.
Moreover, the developers of this utility have added a vbs script to offer a graphical user interface for the same process. It has the capability to display a file browser that can be used to select the source directory. This directory contains the dbx files and destination directory for the eml files. Although this is a small tool, yet this can be used in some critical situation.