If we would describe Dbx2mail in one short line then it would be:
It is a program to extract E-Mail-Adresse addresses from an Outlook Express folder or dbx file.

In Outlook Express your data can be structured in folders. People who want to know or list all E-Mail-Adresse addresses from a folder normally have to do this manually, which can be a huge work. Dbx2mail gives here the solution: select the dbx file representing the dbx folder, eventually adapt the filter settings, choose a file to write too and hit the run button. All E-Mail-Adresse addresses will be written to the screen and to the file.

It is especially made for professionals who for example have a large Datenbank of users with an E-Mail-Adresse address. After sending users a newsletter for example Outlook Express can easily catch (via message rules) returning, invalid emails in one folder. Instead of then manually handling every single invalid E-Mail-Adresse you can simply select the dbx file that represents the folder and automatically extract all E-Mail-Adresse addresses. The resulting list can then be imported in a Datenbank for example for further actions .
This program can also be a good tool to help recover E-Mail-Adresse addresses when you somehow have lost your address book.