Version:            (using KDE KDE 3.0)
Installed from:    Slackware Packages
OS:          Linux

I would like to see the ability to be able to actually perform file compression on mail folders, rather than the space compression which I assume is currently being done on them.

Also, another desirable feature would be to archive mail folders as another user suggested.  However, my suggestion would be to follow the standard that PINE already uses.  It's a good method, it works, it's straight forward, and it's probably what most people would want, anyways.