Open Outlook PST and OST mailboxes in any browser, parsed on-device.
About Mailward
Mailward lets you open an Outlook PST or OST file without installing Outlook and without uploading the archive. A Web Worker reads the file locally, so mail stays on the machine. Browse folders, open messages and attachments, and search the full text. Free use covers opening, reading, searching, and exporting three messages a day. A one-time Pro unlock adds batch export to MBOX or EML plus unlimited single-message export. Useful on Mac, Windows, Linux, and Chromebook.
PlatformsWeb, macOS, Windows, Linux
✓ VerifiedNov 1, 2026
Key features
- Local PST/OST parsing in a Web Worker
- Folder browse, message and attachment view
- Full-text search across the mailbox
- Free export of 3 messages per day
- Pro batch export to MBOX and EML
Made by
Lei Vertri
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