What is the best PST Viewer to open and read Outlook PST files?

I have several Outlook PST files containing old emails, attachments, contacts, calendars, and other mailbox data. I’m looking for a reliable PST Viewer that can open and preview these files without changing or modifying the original PST data.

What features should I look for when choosing a PST Viewer? For example, support for large PST files, ANSI and Unicode PST formats, different Outlook versions, email attachments, contacts, calendars, and searching through mailbox folders.

Also, are there any trustworthy PST Viewer tools that allow users to preview the complete contents of a PST file before deciding whether to export or recover the data?
 
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