Recoveryfix OST Viewer is a free tool that helps you open and read corrupt or inaccessible OST files without requiring Microsoft Outlook. It allows users to view all mailbox items such as emails, contacts, calendars, and more, even from damaged OST files. The interface is user-friendly, making it easy to navigate and explore data. This OST Viewer tool is useful for users needing quick access to their OST data without performing a full recovery.