OST to PST Converter · Viewer

File Opener, Export Tool, PDF

Free · In‑App Purchases

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. Privacy Policy: https://rush.tools/privacy Terms of Use: https://rush.tools/terms

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The developer, Rush Tools LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

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    Information

    Seller
    • RUSH TOOLS LLC
    Size
    • 30.2 MB
    Category
    • Productivity
    Compatibility
    Requires iOS 15.0 or later.
    • iPhone
      Requires iOS 15.0 or later.
    • iPad
      Requires iPadOS 15.0 or later.
    • iPod touch
      Requires iOS 15.0 or later.
    • Mac
      Requires macOS 12.0 or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 RUSH TOOLS LLC.
  • Developer Website
  • Privacy Policy
  • License Agreement

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