Converts, Compacts and Splits OST Files & Save as PST

Stellar Converter for OST Technician is a comprehensive solution that not only converts Outlook OST files into PST files, but also facilitates compaction and splitting the PST files before saving. After conversion, the converted data is saved in a new working PST file that can be imported directly into MS Outlook to regain access to the mail items.

  • Converts orphaned OST file into usable PST file

  • Enables Compaction & Splitting of the Converted PST file
  • Exports the converted files to live Exchange Server
  • Saves the converted file in Office 365, DBX, MBOX, MSG, EML, RTF, HTML, & PDF
  • Exports all contacts in CSV file format
  • Conversion of multiple OST files using Batch Conversion
  • Supports MS Outlook 2019, 2016, 2013, 2010, 2007, 2003, 2002, 2000

*A free demo version, you can check preview all the mail items & save 20 items per folder

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Key Features

Converts Offline Exchange Folders to PST icon

Converts Offline Exchange Folders to PST

Equipped with several advanced options, it converts orphaned Outlook OST files to PST files. The software extracts all inaccessible mails, calendar entries, contacts, tasks, notes, journal, etc. in their original form and exports them to a working PST.

Option to Find, View & Save  icon

Option to Find, View & Save

This advanced converter facilitates you to find and view mail messages based on the criteria – Date, From, To and Subject, which helps in selecting the right mail items for conversion. In addition, it also allows you to save the converted files in Office 365, DBX, MBOX, MSG, EML, RTF, HTML, and PDF formats.

Compacts Converted Files and Saves as PST  icon

Compacts Converted Files and Saves as PST

OST Converter provides an option to compress the file before saving it as PST and in-turn minimizes the risk of PST corruption that triggers due to oversizing. The software follows an advanced methodology to compact the PST files without modifying the original properties and formatting of emails. There are four options based on which you can compress the PST file

  • Compress all attachments in the newly created PST.
  • Extract, compress and save attachments to a folder.
  • Remove all attachments in the new PST file.
  • Extract and save attachments to a new folder, without the loss of the interlinking.
Split the Converted File before Saving as PST  icon

Split the Converted File before Saving as PST

Advanced OST converter lets you to split the large files into smaller ones based on specified split criteria, such as Date, Size, Mail Id and Folder. This feature is very helpful when you have a bigger PST file and you want to break it in to smaller ones in order to avoid possibilities of becoming corrupt or damaged. This software provides you the following options to split converted file

  • For splitting by ‘Mail ID’ option, you should select at least one mail Id for splitting the PST file.
  • Splitting by Date range, will create a single PST file which will include those mail items of the date range set by you.
  • Splitting by ‘size’ enables you to split a large PST file by pre-defined sizes.

Additional Advantages

Export PST files to live Exchange Server  icon

Export PST files to live Exchange Server

The Technician version of software lets you to export the converted PST files to a live exchange server. This can be done easily by following a few simple steps. However, one important thing that should be noted is that the system from which you want to export the PST files must be a member of the server domain

Save all contacts in CSV file format icon

Save all contacts in CSV file format

Stellar OST conversion tool now allows you to export all the contacts present in your Offline Mailbox (OST file) in CSV file format. The CVS file can be opened in a text editor, allowing you to go through all the saved contacts easily

Batch Conversion Module icon

Batch Conversion Module

Batch conversion feature supports the conversion of multiple OST files into their corresponding PST files at same point in time. Allows saving the PST file at the source destination as well as at preferred location. File conversion is accomplished using two options - “Convert Mailbox” and “Convert & Split Mailbox”.

  • Start the Batch Conversion process with either “Drag & Drop OST” or “Add OST” option and add as many OST files. Or “Find OST” option, if OST location is not known.
  • Convert and save all OSTs of Batch file directly at source location by selecting the “Convert Mailbox” option. Click on “Click Here” button to save PST files at preferred location.
  • “Convert and Split Mailbox option” enables splitting the PST files on the basis of either “Split By Date” or “Split By Size” option.
Export PST files to Office 365  icon

Export PST files to Office 365

This tool selects and converts OSTs and the converted files are directly exported to Office 365. Exporting PST files to Office 365 is particularly beneficial in those cases where organizations shift from on-premises Exchange to Cloud Office 365 wherein this software ensures easy and smooth mailbox migration. With Office 365 Account, converted OST files are directly exported to Office 365 by simply selecting Office 365 as an option and entering its login credentials.

Allows to Save & Load Scan Information  icon

Allows to Save & Load Scan Information

Save and Load scan lets you manage the scanning and saving time by allowing a time-lapse between scanning of OST file and saving of converted file. Download the free version of Stellar OST Converter software and scan the OST file. Verify all components of converted OST file and save the scanned information as DAT file at preferred location. Next, register the software, load the Saved scanned information available in the form of DAT file, and without undergoing the scanning procedure again, save the converted file in preferred format.

New Look and Enhanced GUI  icon

New Look and Enhanced GUI

The New look software is easy to understand and promotes intuitive working as the User interface and User Design bear a resemblance to MS Outlook interface. The clutter-free clean interface displays commonly used menu-icons on the top and allows a smooth functional flow of all the tasks.

Preview of Mails  icon

Preview of Mails

Once the scanning of selected OST is completed, this software lists all the mails, & other components such as 'Calendar', 'Contacts', 'Tasks', 'Notes', etc. in the left pane. The preview pane shows the data exactly the way you view the mails, calendar, and contacts etc. in your native Microsoft Outlook

Save Files using Naming Convention icon

Save Files using Naming Convention

OST Conversion tool for Technicians allows you to select a desired name to save the converted PST files. This feature will make it easier for you to remember the folder name as well as the location of the new PST files.

Try Stellar Converter for OST Technician to Convert, Compress & Split OST files

*A free demo version, you can check preview all the mail items & save 20 items per folder

Software Specifications

System Requirement

ProcessorPentium Class

Operating System Windows 10, 8.1, 8, 7

Memory2 GB minimum (4 GB recommended)

Hard Disk250 MB of free space

Software Delivery


License & Version

Technician LicenseMultiple Users


Interface Available

Language SupportedEnglish, German, French, Italian, Spanish



The demo version of the software is for free evaluation and analysis. Using the demo version, you can scan the OST file (even a corrupt one), preview all mail items and save 20 items per folder. To save the converted file as PST, or to compress, or split before saving, you need to register for the full license.


Yes, you can export all contacts present in your OST file to CSV file but some important fields will be filled with 'Demo' string.


Please follow the following steps, if you are facing the problem.

  • Open 'Control Panel'
  • Double Click the 'Mail' folder
  • Select 'E-mail Accounts' in 'Mail Setup' dialog box (This step will lead to a configuration of your email account)
  • Close the dialog box, after the mail account is configured and open MS Outlook

How to view a Newly Created PST File

To view a newly created PST file with the software, you can either import the PST file in MS Outlook or follow the steps mentioned below.

  • 'Open > Outlook Data File from File Menu'

Yes, with Technician version, you can convert over-sized OST files. The good thing with the software is that you have the option to split the converted over-sized file at the time of saving it.


The time to scan the OST file depends primarily upon its size. You can view the progress bar during scanning that indicates that the process is going on. After the process is over you will get a message - 'Scanning of selected OST file completed'.


To locate and access the contacts; first, you need to import the new PST file to MS Outlook. Then follow the steps mentioned below.

  • Open MS Outlook
  • Press the key combination 'Ctrl+Shift+F'. The 'Find Message / Advanced Find' window opens up
  • Under the 'Look For' tab, select 'Contact'.
  • Click on the 'Browse' button
  • Select the imported PST file
  • Click 'Find Now'
  • You can now see all the contacts.

Yes, you can view and save the entire Log of the process followed during the software run. Follow the steps mentioned below.

  • Select 'View Log Report', in the 'View' menu
  • Click 'Save Log' and in Stellar Converter for OST Technician dialog box to any location you desire
  • You can now see all the contacts.

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