Advanced Software to Convert, Split, or Compact an OST File

Stellar Converter for OST Technician is an advanced software for converting the inaccessible OST file into PST file and extract the mailbox data with 100% precision. The tool also allows the user to Split or Compact the output PST file with options to export the PST file directly to Live Exchange or Office 365.

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

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When To Use Stellar Converter For OST Software?

In several scenarios, you may find this tool of great help. For example, In case there is need to Extract Mailbox Data from OST File especially when you delete a user mailbox from Exchange and there is no backup, the only way to access the mailbox data is through the OST file. However, you cannot recreate or rebuild OST file if the Exchange user account is deleted from Active Directory. Stellar OST converter tool converts the inaccessible OST file and extracts the mailbox items in a PST file. Likewise, when there is need to migrate deleted mailboxes without backup. Consider that you are upgrading your Exchange organization and need to migrate a large number of mailboxes, including the deleted mailboxes. If you do not have a local backup of the deleted mailboxes, the only way is to extract the data from the OST. The Stellar tool can convert OST to PST and extract the complete mailbox data.

Key Features

Converts Large OST & Extracts All Items

The software can convert OST files of any size and extract the complete mailbox data, including emails, attachments, contacts, calendars, tasks, notes, journals, etc. with 100% precision. Stellar Converter for OST Technician can also export the contacts from the OST to a CSV file.

Converts OST Files in a Batch

The tool allows the user to convert multiple OST files in a batch process, allowing the extraction of data in bulk. The software can also create and manage a batch file having the OST file details such as location, destination path, start & end date, etc. to allow efficient conversion of OST files.

Previews the Mailbox Data

The software shows an enhanced preview of the mailbox data after completing OST file conversion. The Preview pane displays a list of all the Folders, Calendar, Notes, Journal, Tasks, etc. in the left pane. The user can click the listed items to view the details such as email body text, embedded hyperlinks, etc.

Saves in Multiple File Formats

The software can save the converted mailbox data in multiple file formats such as PST, MSG, EML, RTF, HTML, PDF, DBX, and MBOX. The option offers the flexibility to access the data through different applications such as web browser, PDF reader, etc.

Splits the PST File

The tool allows the user to split the output PST file as per the email ID, date range, or size. It can split the PST file in the sizes of 1–50 GB while preserving the original mailbox structure and data integrity. The feature helps in improving the manageability of large PST files.

Compacts the PST File

The advanced OST to PST converter software can compact a large PST file and compress all attachments in a new PST. It can also extract, compress, and save attachments to a folder while preserving the interlinking to open the attachments. The tool can also remove the attachments while saving the data in PST file.

Exports the Data to Exchange

Stellar Converter for OST Technician Edition can export the output PST file to Live Exchange. After converting the OST file into PST, select the “Export to Live Exchange Server” option, and enter the Admin user credentials and destination mailbox details to export the data to the live Exchange Server.

Exports the Data to Office 365

The Technician edition can also export the output PST file to an Office 365 account. After converting the OST file into PST, select the “Export to Office 365” option, and enter the login ID and password to export the OST data to Office 365.

Allows to Save & Load the Scan File

The tool allows the user to save the OST file ‘scan’ information in a DAT file and load it later to continue the OST to PST conversion. This feature allows the user to perform the OST to PST conversion task at different times or on different machines.

*Free download to scan and preview your lost or deleted data.

How It Works?

Software Specifications

About Product

Release Date August, 2020
License Can use only on a single system
Edition Corporate, Technician, & Toolkit
Language SupportedEnglish, German, French, Italian, Spanish
System Requirements

Processor: Intel-compatible (x86, x64)
Operating System Windows 10, 8.1, 8, 7
Memory: 4 GB minimum (8 GB recommended)
Hard Disk:250 MB of free space
Download Guides


Try Stellar Converter for OST to few clicks

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

You're in Good Hands



Use following steps for successful conversion:

  • Run Stellar Converter for OST software.
  • Select your OST file from ‘Browse’ option.
  • Click ‘Convert’ button to start the scanning process.
  • Click 'Save Converted File' button to save OST file into Different file formats.
  • Select ‘PST’ file option to convert OST file to PST format.
  • Click on ‘Browse’ button to select destination path and click ‘OK’ button.
  • Congratulations, your PST file saved at your specified location.

The software will scan the OST file and list all the mailbox folders in the left pane. Click on a folder to preview its items and save them at a destination location.


With the demo version of the software, you can save only 20 items per folder. However, in order to save all the converted items, you need to purchase the full version of the software.


Yes, the software allows you to search for Offline Folders (OST) files in any folder, sub-folder, or drive in your system. You can use the 'Find Outlook File' option of the software to locate OST files in the selected drive and choose the desired file for conversion.


You may require migrating from OST file to PST in any of the following cases:

  • Your mailbox on the Exchange Server is deleted accidentally and you need to access your emails.
  • You are facing issues while synchronizing MS Outlook with Exchange Server.
  • You need to carry your business emails to a different workplace or organization

The time required by the software to perform ost to pst conversion heavily depends on the size of your OST file. The software efficiently scans your OST file and tries to deliver the best performance with reliable and accurate results.


For importing your PST file into MS Outlook, follow these steps:

  • Start MS Outlook.
  • On the 'File' menu, click 'Open' and then select 'Outlook Data File'.
  • Choose the PST file you need to import and click 'OK'.
  • After the process is completed, MS Outlook will create a new personal folder (PST) file.

The software gives the option to save the converted OST file in MSG, EML, PDF, RTF or HTML formats.


The Software does not perform any action on corrupt OST file. The software converts corrupt OST file into accessible PST file which you can easily import into MS Outlook to access all your OST file data.


If you face any problem during the OST file conversion or after the conversion, you can contact our support team


The software offers two versions – Corporate & Technician. If you only need to migrate OST file into PST file format then you should go for Corporate. Some advanced features of Corporate version are listed on the page. If you want to convert as well as compact & split large OST file then you should go for Technician version. Technician version also has the option to save OST file into Office 365.

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