Convert inaccessible/corrupt OST files into new Outlook PST files

Stellar Converter for OST

Join our mailing list

Stay up to date with latest software releases, news, software discounts, deals and more.

Download Stellar Converter for OST 12.1

Stellar Converter for OST

  -  22.8 MB  -  Demo
  • Latest Version:

    Stellar Converter for OST 12.1 LATEST

  • Requirements:

    Windows 7 / Windows 8 / Windows 10 / Windows 11

  • User Rating:

    Click to vote
  • Author / Product:

    Stellar Information Technology / External Link

  • Old Versions:

  • Filename:


Stellar Converter for OST is a powerful email management utility that can help professionals and businesses to extract inaccessible OST files (offline folder files) in Microsoft Outlook and convert them into easily accessible Outlook PST files (Personal Folders file that contains local copies of Mailbox content).
  • Converts orphaned, encrypted, or IMAP OST into PST
  • Supports Outlook 2021, 2019, 2016, and earlier versions
  • Exports OST file data to Office 365, MS Outlook, and live Exchange (Technician Plan)

Stellar Converter for OST is a proficient software application developed by Stellar, a renowned name in the field of data recovery and conversion tools. It primarily serves the purpose of converting OST files, which are typically associated with Microsoft Outlook, into PST (Personal Storage Table) files. This conversion process not only allows you to regain access to your Outlook emails but also ensures compatibility with a wider range of email clients and applications.

Built from the ground up to be capable to work with large OST and PST archives, this enterprise-grade application can quickly, easily, and reliably convert encrypted or orphaned OST files. It features full support for all the latest versions of the Outlook app (2021, 2016, 2016, and even earlier versions), and has a built-in converter for exporting all recovered data to Office 365, MS Outlook, and live Exchange.

OST file is a temporary backup that Microsoft Exchange keeps for every connected user and their mailbox. It contains all data associated with that account, which includes local copies of messages, calendar events, and many other items. This archive is accessed and updated when users are working on their account offline, with Exchange service synchronizing newly added data with live content on cloud servers when the internet connection is established. However, if a user's Mailbox is deleted or corrupted before an active backup is made, the only way to regain access to mailbox data is by recovering and converting the OST archive.

Stellar Converter for OST performs this activity reliably and quickly, enabling teams, companies, and organizations of all sizes to export OST into PST, and manage PST with an advanced “8-in-1 solution” Stellar Toolkit utility that provides tools such as merging, splitting, partial deleting, and exporting. Users even have the ability to merge multiple OST files into a single PST.

To accelerate the procedure of recovering data from OST archives, Stellar Convert OST to PST can automatically locate and list Outlook data files, provides previews for all found local files, built-in search engine, auto splitter of large PST archives, and many other extraction, conversion, sorting, and filtering tools. The advanced Technician licensing tier even allows for direct exporting of multiple mailboxes from OST and PST archives into Office 365 accounts, both individually and as a batch processing procedure. The most expensive “Toolkit” license tier can even recover lost Outlook passwords and attempt recovery of deleted emails.

Main Features

Effortless OST to PST Conversion: Stellar's proprietary algorithms ensure quick and precise conversion of OST files to PST format, preserving all email attributes and folder structures.

Selective Item Recovery: Users have the flexibility to select specific items or folders from the OST file for conversion, making it easy to extract only the necessary data.

Preview Mode: The software provides a preview of mailbox items before initiating the conversion process, allowing users to verify the data they are about to convert.

Support for Encrypted OST Files: It can handle password-protected and encrypted OST files, making it versatile for various scenarios.

Batch Conversion: It supports batch conversion, enabling users to convert multiple OST files simultaneously, saving time and effort.

Save to Multiple Formats: Apart from PST, you can save converted data in other formats like MSG, EML, RTF, HTML, and PDF, making it compatible with a wide range of email clients.

Exchange Server Compatibility: The software works seamlessly with Exchange Server OST files, ensuring you can recover data from both personal and enterprise email accounts.

Search and Filter Options: Stellar offers advanced search and filter options to locate specific emails quickly, even in large OST files.

Preservation of Folder Hierarchy: The software maintains the original folder hierarchy, ensuring your email organization remains intact.

Compare Editions

Corporate Plan
  • Converts OST into PST format
  • Lists all OST files from the default location
  • Converts All Offline Mailbox items with Free Preview
  • Saves & loads scan data
  • Auto-splits large PST files while saving the mail items
  • Advanced filter options for precise conversion
  • Saves the mailbox data in PST, EML, MSG, RTF, HTML, and PDF file formats
Technician Plan
  • Includes all features of Corporate
  • Converts multiple OST files in batch
  • Compacts & Splits PST file
  • Exports to live Exchange
  • Exports to Office 365
  • Exports to MS Outlook
  • Exports contacts in CSV file
Toolkit Plan
  • Includes all features of Technician
  • Repairs corrupted PST file
  • Recovers the mailbox items
  • Merges multiple PST files
  • Removes duplicate emails
  • Recovers lost password of PST
  • Restores the deleted emails
While Stellar Converter for OST can be downloaded for free when it activated only a limited set of preview tools, fully featured versions of this app are accessible only via a premium subscription. It offers three tiers of usage -Corporate, Technician, and Toolkit.

User Interface

The user interface of the program is very clean, intuitive, and user-friendly. Even users with limited technical expertise will find it easy to navigate through the software. The conversion process is divided into simple steps, and each step is well-explained, making it accessible to a broad audience.

Installation and Setup

Installing the PC program is a straightforward process. You can download the software from the official website or FileHorse and follow the installation wizard's instructions. The setup process is quick and does not involve any complex configurations. Once installed, the software is ready to use.

How to Use

Launch the Software: After installation, open the Win software.

Select OST File: Click on "Select OST File" to browse and choose the OST file you want to convert.

Preview Emails: The software will display a preview of all the mailbox items. You can select specific emails or folders for conversion.

Choose Output Format: Select "PST" as the output format or choose from other available formats.

Start Conversion: Click the "Convert" button to initiate the conversion process. The software will save the converted PST file to your specified location.


Is Stellar Converter for OST compatible with all versions of Microsoft Outlook?
Yes, the app is compatible with all versions of Microsoft Outlook, including Outlook 2021, 2019, 2016, 2013, and older versions.

Can I convert multiple OST files simultaneously?
Yes, the software supports batch conversion, allowing you to convert multiple OST files in one go.

Does the software maintain the folder hierarchy during conversion?
Yes, it preserves the original folder structure, ensuring your email organization remains intact.

Is it possible to recover data from password-protected or encrypted OST files?
Absolutely. It can handle password-protected and encrypted OST files with ease.

Can I preview the email items before converting them?
Yes, the software offers a preview mode that allows you to inspect the mailbox items before initiating the conversion process.


Kernel for OST to PST Converter: This tool offers similar conversion capabilities and is known for its speed and efficiency.

DataNumen Exchange Recovery: It's a robust tool for recovering data from Exchange Server OST files.

SysTools OST to PST Converter: This software is known for its user-friendly interface and batch conversion support.


It offers different pricing plans to cater to various user requirements. The pricing typically includes options for both personal and professional use. For the most up-to-date pricing information, it's advisable to visit the official Stellar website.

The Demo/Free version of the software converts the Outlook OST file and previews the complete mailbox data. It also allows you to extract and save up to 20 items per folder.

System Requirements

Before installing Stellar Converter for OST, ensure that your system meets the following minimum requirements:
  • Operating System: Windows 11/10/8.1/8/7 (32-bit or 64-bit)
  • Processor: Intel Pentium Class
  • RAM: 4 GB minimum
  • Hard Disk: 250 MB of free space
  • MS Outlook: Outlook 2021, 2019, 2016, 2013, 2010, 2007, 2003, or Office 365
The app can easily run on any modern PC hardware with at least 4GB of RAM and is optimized for all modern versions of Windows OS (Windows 7 and newer). The user interface is also translated into five international languages.

  • Effortless and accurate OST to PST conversion.
  • User-friendly interface.
  • Preview mode for item verification.
  • Batch conversion support.
  • Compatibility with encrypted OST files.
  • Preserves folder hierarchy.
  • Support for multiple output formats.
  • Windows-only software.
  • Limited free demo version.

Stellar Converter for OST is an exceptional tool for anyone dealing with Outlook OST files. Its ease of use, comprehensive feature set, and compatibility with various Outlook versions make it a top choice for individuals and IT professionals. Whether you need to recover emails from a damaged OST file or simply want to migrate data to a different email client, Stellar Converter for OST delivers on its promises.

While there are alternatives on the market, Stellar's reputation in the data recovery industry and the quality of their software make it a reliable and valuable investment for anyone in need of OST to PST conversion.

  • Stellar Converter for OST 12.1 Screenshots

    The images below have been resized. Click on them to view the screenshots in full size.

What's new in this version:

Stellar Converter for OST 12.1
- Change log not available for this version

Stellar Converter for OST 12.0
New Features:
- Converts orphaned, encrypted, or IMAP OST into PST
- Supports Outlook 2021, 2019, 2016, and earlier versions
- Exports OST file data to Office 365, MS Outlook, and live Exchange
- Scanning & Saving speed is improved - New
- Support of OST files having size more than 50 GB is added
- While Saving large size OST files, user can use the auto split functionality. User can also turn it off while saving
- While scanning and saving, software captures the information of Windows OS , Microsoft Office and scanning process which will be available on uninstallation survey page
- Support for Windows 11 & MS Outlook 2021 is added

Join our mailing list

Stay up to date with latest software releases, news, software discounts, deals and more.