I've tried several tools for opening PST files, but the MSOutlookHelp PST File Viewer impressed me. Best of all, it operates independently of Outlook — just what I needed. It quickly scanned my PST files and revealed the entire folder structure, along with emails and attachments. You can check the performance of the tool through its demo version and convert emails into formats such as PDF or EML, although the demo version restricts you to saving 50 emails per folder. I found the date filter to be particularly helpful while searching for specific messages. Moreover, it functions smoothly on older Windows computers and fulfills its promises — and does so effectively.

For more details: https://www.msoutlookhelp.com/pst-viewer/