How can I inspect an old PST archive when Outlook is unavailable?

I recently found several PST archives on an older storage drive. I know they contain emails from previous projects, but I don't currently have Outlook installed on the system I am using. I don't necessarily need to send or receive email from these files; I just want to search through the archive and check specific messages.

I was wondering whether a separate utility would be more practical than installing Outlook. The PST files contain multiple folders, and manually converting everything just to find a few emails doesn't seem like an efficient approach.

During my research, I found SysInfo PST Viewer, which is intended for viewing PST mailbox data without depending on Outlook. This seems relevant for situations where someone has archived PST files but doesn't want to configure an entire Outlook environment simply to inspect them.

One thing I would want from a viewer is proper folder navigation. If the PST contains custom folders and subfolders, the software should ideally preserve that structure so that finding older messages doesn't become confusing.

I am also curious about searching. If a PST contains several years of emails, being able to locate messages by subject, sender, or other available information could save considerable time. Has anyone used a standalone viewer for this type of archive investigation?

A dedicated PST file viewer would also be useful if it can preview attachments. Sometimes the email itself isn't enough because the information I need is contained in an attached PDF, spreadsheet, or document.

Another question is whether there are risks involved in opening an old PST with a viewer. I would prefer a read-only style workflow where the original archive is not modified. Keeping a backup of the PST is obviously important, but I would still like to understand how these applications handle source files.

For users trying to open PST file without Outlook, what approach has worked reliably for you? I am particularly interested in solutions that don't require creating an Outlook profile or importing the PST into another mailbox.

If anyone has experience with SysInfo PST Viewer or similar standalone tools, I would appreciate feedback on compatibility with older PST archives, large mailbox files, folder browsing, email preview, and attachment handling.

My requirement is fairly simple: access the contents of an existing PST archive, find specific emails, and inspect attachments without setting up Outlook. I would prefer a straightforward viewer rather than a full migration or recovery workflow.