Screenshots
Simple
All columns showing

Download
1.0   Unlimited & free. (source included for personal use)

Installation
MailColumns can live anywhere on your BeOS disk.
It is not dependent on any specific BeOS component.

How to use it
Just run it. MailColumns integrates seamlessly with Tracker.

It will register a few extra Tracker columns with the
Folder filetype; Columns you can select from the Attributes
menu in the Tracker windows displaying your email.

To turn MailColumns off, run the script called "Quit MailColumns".

Command-line Options
--no-reg   do not register attributes
--help     display help text