OST to PST Converter · Viewer

Open any OST file without Outlook and convert it to PST, MBOX, PDF and more. Read your mail, then export it, verified item by item. 100% Offline OST to PST Tool.

Stuck with an OST file you cannot open? OST to PST Converter opens your Outlook offline data file directly, with no Outlook and no Exchange server needed, and converts it to PST and the other formats you actually use, right on your Mac, iPhone, and iPad.

Open the file, read every folder and message for free, then convert only what you need. Every PST conversion is checked item by item, so nothing goes missing.

WHAT YOU CAN DO • Open and read any .ost file, even an orphaned or disconnected one, without Outlook • Browse the full folder tree and search mail by subject, sender, or text • View contacts, calendar events, and attachments • Convert to PST and open it on any PC • Also export to MBOX, EML, PDF, CSV, HTML, vCard, and ICS • Export a whole mailbox or just the folder you choose

EXPORT FORMATS • PST, a single data file you can open on any PC, verified item by item • MBOX for Apple Mail, Thunderbird, and other mail apps • EML, one message per file, with the folder structure preserved • PDF for reading, printing, and sharing • CSV of the message list • A browsable HTML archive • vCard (.vcf) contacts and ICS (.ics) calendar events

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, with item by item verification

PERFECT FOR • Opening an OST when Outlook will not, or the file is orphaned or offline • Converting OST to PST to move your mail to another computer • Reading, exporting, or archiving an old offline mailbox

OST to PST Converter is an independent app and is not affiliated with, endorsed by, or sponsored by any email software vendor. OST, PST, and Outlook are referenced only to indicate the file formats the app works with.

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