For users who need to read PST files safely without installing Microsoft Outlook, the PST File Viewer by MSOutlookHelp is a reliable solution. This freeware tool allows you to open and preview PST emails, contacts, calendars, tasks, notes, and attachments with ease. It supports both ANSI and Unicode PST files and works with all major Outlook and Windows versions. Users can open single or multiple PST files without size restrictions, making it ideal for large mailbox archives. The upgraded edition also converts PST data into PDF, EML, MSG, MBOX, CSV, DOC, and other formats. Its clean, user-friendly interface helps even non-technical users access Outlook data securely. The software also includes advanced filters, attachment preview, duplicate removal, and date-range selection for accurate results. 

There are multiple best software that is use to read pst files without outlook safely you can find it on google and then convert this file free.