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Mailward
Open PST & OST files in your browser - private, no Outlook
Open, read, and search an Outlook PST or OST archive in your browser — on a Mac, PC, or Chromebook, no Outlook or Exchange needed. Nothing is uploaded; the file is parsed on your own machine.
Hi Product Hunt! Maker here.
I built Mailward after seeing the same problem come up again and again: someone has an Outlook .pst or .ost archive - an old backup, an export from a previous job, the mailbox of a colleague who left - and no way to open it. Outlook is gone (or was never there - hello Mac users), and every "free online PST viewer" wants you to upload your entire mailbox to their server, which is exactly the file you should never upload anywhere.
Mailward does it differently: the archive is parsed entirely in your browser with the File API and a Web Worker. Nothing is uploaded - you can load the page, go offline, and it keeps working. It streams the file in pages, so multi-gigabyte archives open without crashing the tab. And it reads OST caches directly, no Exchange connection needed.
Free forever: opening, reading, full-text search, single-message export. One-time $19 license: batch conversion to MBOX/EML and bulk attachment export. No subscription.
Would love your feedback - especially from anyone with a gnarly old archive that other tools choked on.
parsed a 6gb pst in my browser without uploading anything, which is genuinely the part that sold me. search was fast too
Handy for digging through old PSTs without firing up a Windows VM. Search worked surprisingly fast on a 5GB archive I had lying around.
Parsing locally is a great approach, especially for people handling sensitive mail archives. One thing that would make this much more useful for me would be exporting search results or selected folders back to a standard format like mbox or EML so I can share or back them up without needing Outlook again.
About Mailward on Product Hunt
“Open PST & OST files in your browser - private, no Outlook”
Mailward was submitted on Product Hunt and earned 0 upvotes and 6 comments, placing #55 on the daily leaderboard. Open, read, and search an Outlook PST or OST archive in your browser — on a Mac, PC, or Chromebook, no Outlook or Exchange needed. Nothing is uploaded; the file is parsed on your own machine.
Mailward was featured in Email (36.7k followers) and Privacy (11.2k followers) on Product Hunt. Together, these topics include over 15.2k products, making this a competitive space to launch in.
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