TweakOL is a standalone utility that allows you to change hidden functions in Microsoft Outlook. Features include:

- Always show BCC field
- Minimize to the Windows system tray
- Dis/enable MSN Messenger
- Dis/enable Attachment Security
- Dis/enable HTML in received messages (PlainText only)
- Dis/enable Logging details to a file
- 'Icon on desktop' restores/removes the 'special function' Outlook icon