I recommend using the MailConverterTools PST Viewer Software to view and open PST files without Outlook. The software does not require the Outlook application to open, view, or read PST files. Additionally, it supports PST files from all Outlook versions. With the help of this software, users can convert PST to MBOX, PDF, MSG, EML, and CSV. You can open password-protected PST files, even if you're unable to recover them. The software is a Windows-based utility and works on all major versions of Windows Operating Systems. Moreover, this tool has no size limitations, allowing you to open large PST files and view corrupt PST files without any data loss.