OpenMSG is a lightweight, modern viewer for Microsoft Outlook .msg files, built for clarity, speed, and convenience. Whether you're reviewing archived messages, managing email attachments, or inspecting message headers, OpenMSG provides a straightforward, efficient solution—without requiring Microsoft Outlook. OpenMSG opens .msg files natively on Windows using a sleek WinUI 3 interface. It is ideal for legal, administrative, and technical workflows where quick access to .msg content is essential.