If you need to view archived mailboxes on a PC that doesn’t have Outlook, MSOutlookHelp PST Viewer can help. It enables you to open PST files without Outlook and instantly access old emails and mailbox contents. The tool supports both older and newer PST formats, so files from any Outlook version will load. It also lets you view multiple PST files in bulk — useful for reviewing data from different accounts or devices. For users who just want reading access, this makes retrieving information much easier.

For more: https://www.msoutlookhelp.com/blog/how-to-open-pst-file-without-outlook/