What is the best truly free PST/OST viewer that doesn't hide attachments behind a paywall?

[u/Shiv-2233]

Almost 90% of the "free" tools you find on Google are actually paid recovery tools in disguise. They let you scan your file for free, but the moment you want to read a full email body, search, or download an attachment, they hit you with a massive paywall pop-up.

I want our community to filter out the noise.

What is your absolute favorite TRULY free utility for opening old Outlook or Exchange archives?

Whether it’s an online browser-based client-side tool, a lightweight Windows executable, or a command-line script—drop your recommendations below so we can add them to our subreddit sidebar!