Tray Helper it's freeware, award winning application with many features (f/e: email checker, auto mail responder, anti-spam, popup-killer, event reminder and more).
There was a new version (4.8) released recently (April 28, 2005) with following changes:

- Added feature to save e-mail messages in EML file format.
- In folders dialog it's possible now to read messages of MS Outlook Express.
- Viewing next / previous message is much easier and faster now.
- Reduced memory requirements when holding large number of messages.
- Improved viewing and saving attachments.
- Many small improvements in user interface of application.
- Fixed some minor bugs.