Drats. This actually seemed like it might be really useful, especially for organizations who want to use a drupal webmail interface for transparency, but want the person in charge of email to be able to respond from their own email client (also IMAP configured). That way, replies would sync and be visible on the drupal webmail interface.

Anyhow, just thought I'd throw out a potential use for this :)
If I ever get confident enough with my drupal skills, maybe I'll take a whack :)