About this app

Need to move an Outlook PST or OST mailbox somewhere else? PST to MBOX Converter opens your Outlook data file directly, with no Outlook and no Exchange server needed, and converts your mail to MBOX, PDF, or HTML, right on your Mac, iPhone, and iPad. Pick your file, see exactly what is inside, then convert it to the format you need. WHAT YOU CAN DO • Open any .pst or .ost file without Outlook or an Exchange server • See a clear breakdown before you convert: how many folders, messages, and attachments it holds • Convert to MBOX, ready for Apple Mail, Thunderbird, and other mail apps • Save your mail as a PDF, or as a browsable HTML archive • Keep the original folder structure, or flatten it, and skip duplicate messages • Split a large mailbox into parts to fit import size limits OUTPUT FORMATS • MBOX, ready to import into Apple Mail, Thunderbird, and other mail apps • PDF, a clean, printable copy of your mailbox • HTML, a browsable archive you can open in any web browser BUILT RIGHT • Runs on Mac, iPhone, and iPad • Everything happens on your device. Your mailbox never leaves it • No account, no sign in, nothing is uploaded • Handles large, multi gigabyte files • Fast, reliable, and faithful to the original PERFECT FOR • Moving an Outlook PST or OST mailbox to Apple Mail, Thunderbird, or another app • Converting a PST or OST to MBOX when you do not have Outlook • Saving or archiving an old mailbox as a PDF or HTML PST to MBOX Converter is an independent app and is not affiliated with, endorsed by, or sponsored by any email software vendor. PST, OST, and Outlook are referenced only to indicate the file formats the app works with. Privacy Policy: https://rush.tools/privacy Terms of Use: https://rush.tools/terms

Latest release

What’s New

Version 1.0.3 Jul 31, 2026

Fixed an export issue in our PST to MBOX converter app where temporary working files were not cleaned up properly on Mac. Minor bug fixes and performance enhancements.

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