If you are looking for the best solution to open OST files without Outlook, I recommend the SysInfo OST Viewer Tool. This tool allows you to open and read OST files without installing Microsoft Outlook or Exchange Server. It supports both healthy and corrupted OST files and lets you open multiple files at the same time. You can easily view all mailbox items, such as Emails, Contacts, Tasks, Journals, and Calendar entries, with complete details and attachments. There is no file size limitation, so even large OST files can be accessed smoothly. After scanning, the software also provides options to save or convert the data into formats like PST, PDF, MBOX, MSG, EML, EMLX, CSV, HTML, and DOC. The interface is simple and user-friendly, making it suitable for all types of users. Use this software on every version of Windows as well as Linux OS.