If you are trying to readable PST file format without Outlook, you can use a dedicated MSOutlookHelp PST viewer tool. These utilities open PST files directly and display emails, contacts, calendars, and other mailbox items without requiring Outlook installation. After loading the PST file, you can preview the data and export it into common formats such as PDF, EML, MSG, MBOX, CSV, or HTML for easy access. Some tools also allow batch conversion of multiple PST files and support corrupted file recovery. Alternatively, you can use Thunderbird with add-ons or web-based viewers that support PST import. Always choose a trusted tool to ensure data safety, especially when handling large or sensitive mailbox backups. This approach makes PST data accessible, portable, and readable across different platforms without Microsoft Outlook installed easily accessible.