You can access PST files without Outlook by using the SysInfo PST File Viewer. This utility allows you to open and read emails, contacts, calendars, and other mailbox data directly from PST files. It supports PST files created by all Outlook versions, including both ANSI and UNICODE formats. It can open multiple PST files at once and handles large files without any size limitations.
Read more: https://www.sysinfotools.com/recovery/pst-file-viewer.php