Menu Hide

Stellar Converter for OST-Overview

Powerful OST to PST Converter Tool

Stellar Converter for OST is a specialized tool for converting inaccessible OST files into Outlook PST file. It extracts all the mailbox items from OST and saves them in PST file with 100% precision. It also allows saving the mailbox data in MSG, EML, RTF, PDF, and HTML formats.


Top Features of Stellar OST to PST Converter 

  • Converts first 20 emails per folder for free
  • Exports the converted OST directly to Office 365 & live Exchange
  •  Allows batch conversion of OST files to PST files in a single process
  • Converts encrypted or IMAP OST file into PST
  •  Splits and compacts large PST files
  •  Supports Outlook 2021, 2019, 2016, 2013, 2010, 2007, 2003, 2002, & 2000

Best outlook ost tool

For Accessing OST File Data

The software helps recover all the mailbox data, including emails, attachments, contacts, calendars, etc., from an OST file and saves it in a PST file. It also helps extract deleted items from the converted OST file. 


Extract Data from Inaccessible OST File

Extracts data from an inaccessible/orphaned OST file and saves the data in PST file. 


Extract Accidentally Deleted Mailbox Data

Extract ‘deleted mailbox’ data from OST file.


Batch Convert Multiple OST Files

The software converts multiple OSTs to PSTs in a batch

Top features of Software

For all OST to PST Conversion Needs

Stellar OST to PST Converter tool can help convert large-sized, inaccessible, or encrypted OST file into PST format. The software supports Outlook 2021, 2019, 2016, 2013, 2010, 2007, 2003, 2002, & 2000.


Converts Large-Sized OST File

Sometimes, due to huge amount of mailbox data, the size of OST file becomes too large. Due to this, Outlook client may crash and user loses access to mailbox data. In such a case, you can use the Outlook OST to PST software from Stellar® to extract mailbox data from large-sized OST file and save it in PST, with 100% precision.


Converts Encrypted OST to PST

OST files can be encrypted to prevent unauthorized access to mailbox data. Sometimes, you experience issues while trying to open an encrypted OST file, resulting in losing access to the mailbox data. In that case, use Stellar Converter for OST software to convert the encrypted OST file to PST and regain access to the mailbox data. 


Supports Batch Conversion

The software allows you to select multiple OST files and convert them into corresponding PST files in a single process. This saves your time and effort in selecting and converting OST files one-by-one. The ability to batch convert multiple OSTs to PSTs makes the conversion process fast and easy.


Extracts All the Mailbox Items

Stellar Converter for OST extracts all the mailbox items from OST, such as emails, attachments, contacts, calendars, tasks, notes, journals, etc., and saves them to PST file. The OST converter also recovers deleted items from the mailbox.

All in One Solution

Packed with Powerful Features


Free OST to PST Converter

The software allows free conversion of first 20 emails per folder. It lets you scan and preview all the converted OST file items. You just need to download the software, select and convert the OST, see the preview of converted file, and save the converted file at a desired location. Learn More 


Exports OST Data to Office 365 and Live Exchange

The software can export the mailbox data directly to Office 365 or live Exchange. You need to login to the Office 365 account or Exchange on-premises and export data extracted from OST directly to Office 365/Exchange user mailbox.


Converts Selected Emails

The software helps convert selected emails from the OST file. It converts specific email messages, based on various parameters such as 'To', 'From', 'Subject', and 'Date'. You can save the converted items into PST or other file formats, such as MSG, EML, RTF, HTML, and PDF.


Converts OST into Multiple File Formats

Stellar Converter for OST allows you to convert OST file into various file formats, such as PST, MSG, EML, RTF, HTML, and PDF. This feature helps you view the extracted mailbox items in different applications, such as Outlook, web browser, PDF reader, text reader, etc.


Organizes Mailbox Messages

Stellar OST Converter tool maintains Outlook-like structure after conversion. It allows you to sort and organize your email messages by Date, From, To, Subject, Type, Attachment, Importance, etc. before saving them. Additionally, the software’s “Show in Groups” feature lets you improve scan result readability by allowing you to segregate emails in groups.


Save and Load Scan Information

The software allows saving the converted OST file ‘scan’ information in DAT file format, which you can load later to resume the conversion process. Saving the ‘scan’ information is useful when you’re unable to carry out the entire OST to PST conversion process at one-go.


Compacts PST File

The Stellar OST Converter software helps compact the PST files by compressing all the file attachments. It then extracts and saves the attachments in a folder while preserving the links of attachments with their respective emails.


Splits Large-Sized PST File

Large PST files are prone to corruption. The software provides an option to split the large-sized PST file, thus reducing the chances of file corruption. You can split the PST file based on size, date, email ID, or folder. The tool offers to split the PST file in the sizes of 1-50 GB, maintaining the mailbox data's original organization.

Free Download Free Download 100% Secure Buy Now Buy Now

* Free Download enables you to preview the converted file and save 20 items per folder.

How it works

Easy to Use - Converts OST to PST in 3 steps

Stellar Converter for OST is an easy-to-use tool to convert OST file into PST file, without any technical assistance. It helps convert OST to PST in three simple steps: 

Select File

Select File

Select the OST file that you want to convert

Convert the File

Convert the File

Click Convert to start the conversion process.

Save the File

Save the File

Save the converted OST file as PST or other format.

Get The Best Price

Compare the Best Options for OST Converter

Stellar Converter for OST is available in different editions, based on the features and functionalities. Explore and compare the features of each edition, and choose OST converter of your choice


1 Year

25% OFF

` 7,999

` 5,999

Buy Now Buy Now
  • Converts OST into PST
  • Converts all Mailbox items
  • 5 Mailboxes Conversion
  • Free Updates for 1 Year
Most Popular


1 Year

33% OFF

` 17,999

` 11,999

Buy Now Buy Now
  • Converts OST into PST
  • Unlimited Mailboxes Conversion
  • Converts multiple OST files in batch
  • Compacts & Splits PST file
  • Exports to live Exchange
  • Exports to Office 365
  • Exports contacts in CSV file
  • Free Updates for 1 Year


1 Year

36% OFF

` 24,999

` 15,999

Buy Now Buy Now
  • All features of Technician 
  • Converts OST into PST
  • Unlimited Mailboxes Conversion
  • Repairs corrupted PST file
  • Recovers the mailbox items
  • Merges multiple PST files
  • Removes duplicate emails
  • Recovers lost password of PST
  • Restores the deleted emails
  • Free Updates for 1 Year

Technical Specifications

About Product

Stellar Converter for OST



Release Date

November, 2023

License Usage

Single User

Version Support

MS Outlook: Office 365, 2021, 2019, 2016, 2013, 2010, 2007


Corporate, Technician, & Toolkit

Language Supported

English, Deutsch, Français, Italiano, Español, 日本語

System Requirements

System Requirements


Intel-compatible (x86, x64)

Operating System

Windows 11, 10, 8.1, 8, 7


4 GB minimum (8 GB recommended)

Hard Disk

250 MB for installation files



We Are Rated 'The Best' By Our Customers

Stellar Data Recovery
Loading Reviews...
Stellar Data Recovery

Start Using Stellar Converter for OST Today

Powerful Outlook OST to PST conversion tool. Helps convert OST to PST in a few simple steps, keeping the converted file data intact. 

* Free Download enables you to preview the converted file and save 20 items per folder.


How does the demo version of Stellar Converter for OST work?

The demo version helps convert OST to PST and provides a free preview of the converted file data. It also allows to extract and save 20 items per folder from the OST file to PST.

Can the software repair corrupt OST file?

The software does not repair corrupt files. It converts inaccessible OST file into PST file. Users can import this PST file into MS Outlook to access mailbox data. 

Does OST to PST converter tool support MS Outlook 2021?

Yes, the software supports MS Outlook 2021 and lower versions, including MS Outlook 2019, 2016, 2013, 2010, and 2007.

In what format can I save my converted OST file?

Stellar Converter for OST allows you to save the converted file in the following formats:

  •  PST
  • MSG
  • EML
  • RTF
  • HTML
  • PDF
  • DBX (Technician Edition)
  • MBOX (Technician Edition)