# OST to PST Converter · Viewer — File Opener, Export Tool, PDF

> File Opener, Export Tool, PDF (iPhone/iPad app by Rush Tools LLC.)

- Source: https://appshunter.io/ios/app/ost-to-pst-converter-viewer/id6782100037 (this page in markdown: same URL + `.md`)
- Developer: [Rush Tools LLC](https://appshunter.io/developer/1896773547)
- Category: Productivity, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 29 MB
- Languages: American English
- Released: 2026-06-22
- Data updated: 2026-09-07
- User reviews in markdown: https://appshunter.io/ios/app/ost-to-pst-converter-viewer/id6782100037/reviews.md

## What is OST to PST Converter · Viewer?

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

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro Weekly | $9.99 | per 7 days |
| Pro Annual | $69.99 | per year |



## Version history (last 5 releases)

### 1.0.8 — 2026-09-01

Small fixes and general improvements.

(OST to PST Converter · Viewer)

### 1.0.7 — 2026-08-24

Minor bug fixes and reliability improvements.

(OST to PST Converter · Viewer)

### 1.0.6 — 2026-08-20

Minor bug fixes and reliability improvements.

(OST to PST Converter · Viewer)

### 1.0.5 — 2026-08-09

Overall file processing stability has been improved.

### 1.0.3 — 2026-07-31

Fixed an issue in our ost to pst converter app where repeated file exports failed or left temporary files on Mac.

Improved temporary file cleanup and folder creation reliability.

Enhanced overall file conversion stability and performance.

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## More apps by Rush Tools LLC

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All apps by Rush Tools LLC: https://appshunter.io/developer/1896773547

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-07.*