Free OST Converter Tool

Kernel OST Converter Software

2M+Downloads

Efficiently convert OST files to MSG, PDF, HTML and other file formats. Export single/multiple OST files to Office 365, Hosted Exchange, or IMAP servers directly with this Outlook OST converter tool. Restore all your data from inaccessible, damaged, or unhealthy OST files securely and quickly without hassle.

Download the free trial version and migrate 25 items per folder

Convert OST files to over 15 formats, including MBOX, EML, MSG, PDF, and HTML

Export OST data directly to Office 365, Exchange, Gmail, Yahoo, AOL, and other IMAP servers.

Preview emails, attachments, calendars, and other items before conversion.

Easily convert ANSI OST to Unicode for compatibility with newer Outlook versions.

Apply advanced filters to convert selectively by folder, date range, sender, or item type.

Auto-detect and search OST files within system storage for quick access.

Preserve folder hierarchy, email metadata, and UNICODE text during migration.

Convert multiple OST files in a single batch operation

Download the free OST converter tool to convert 25 items per folder.

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Why is Kernel OST Converter The #1 Choice for Enterprise OST Conversion?

Want a robust OST converter tool for secure file conversion? Scroll down to learn why our software is the best choice for enterprise OST file conversion.

Convert OST File to a Single File with Full Integrity

Run the tool to export all the OST data to a single DBX file (Outlook Express) file with full data integrity. Moreover, you can convert OST to MBOX file for easy access on email clients like Thunderbird, Eudora, etc.

Export OST to Multiple Output Files for Granular Control

Export emails from OST files individually with granular control on the file conversion process. Select and convert specific email items from OST files to EML, PDF, MSG or HTML format. Backup, archive, and manage specific email items from the mailbox.

Direct OST to Email Server Migration with Admin Precision

Kernel OST Converter can import OST emails to Office 365 directly. Apart from Office 365, the tool also allows migration of OST file data to other email servers, such as Group Wise, IBM Domino (Lotus Domino), and Microsoft Exchange Server.

Convert OST to Web-Based Email Clients with Zero Data Loss

Directly migrate Outlook emails to Gmail with 100% accuracy and consistency. Additionally, the tool supports an easy export of emails from Outlook OST files to Gmail, Yahoo, iCloud, AOL, and other IMAP based email clients.

Kernel OST Converter Software - Core Features

Explore the powerful features of our OST file converter tool to securely convert OST files into multiple formats and cloud platforms.

15+ Options to Save OST Files

This is the best solution to convert OST file to PST, EML, MSG, MBOX, DBX, and many other formats. It also offers options to save OST data as a single file or multiple files, allowing you to choose easily according to your convenience.

Compatible with all Versions of Outlook OST files

Convert Multiple OST Files Quickly

The Outlook OST converter software allows you to add single or multiple OST files at once. No matter how many small or large-sized OST files are added to the software, it will export all of them at once and create separate resultant files.

Decrypt S/MIME, OpenPGP Encrypted OST Files

Automated OST File Search

You don’t need to search for the OST file at a specific location; the free tool will scan and list the available OST files. You can also choose and add OST files manually in the tool by clicking on the Select Files" or "Select Folders" options.

Convert OST Files Without Exchange Server

Export OST to Cloud Platforms

Export OST file emails, contacts, and other data to Office 365, GroupWise, IBM Domino, and other email servers in a few easy steps. Also, save OST data to Gmail, Yahoo, AOL, and other IMAP-based email clients without hassle.

Convert Selective OST Folders

This Outlook OST converter tool allows you to convert only selective OST file items or folders. Moreover, you can also convert/migrate your entire OST file to your desired file format or platform without any size restriction in no time.

Convert OST Attachments to PDF for Legal Archiving

Keep Data and Metadata Intact

Our powerful Outlook OST converter software keeps the email contacts, calendar, etc., and metadata, including sender, receiver, read/unread status, etc., intact. Moreover, it also extracts the deleted items from the OST file efficiently.

Supports Large-Sized OST File

Kernel OST Converter places no limits on the size or number of OST files you can add for conversion. It smoothly handles OST files of any size and allows you to convert multiple OST files simultaneously without any complications.

Search Specific Items from OST

This Outlook OST file converter has an advanced search feature that scans the OST file and fetches the required OST items. Search across the selected OST folder using parameters, such as sender, recipient, subject, etc.

Convert OST Files Without Exchange Server

No need to establish a connection with the Exchange Server on the device on which the tool is running. Instead of Exchange Server or Outlook, the tool requires OST files only to perform the export to multiple destinations.

Decrypt S/MIME, OpenPGP Encrypted OST Files

Add any OST file encrypted with S/MIME or OpenPGP encryption methods. The tool first decrypts the encrypted OST files and then allows an easy conversion to MBOX or other desired formats. Get the resultant file in the desired format without any encryption in place.

Hosted Exchange Mailbox to PDF

Secure solution that supports all the OST files generated by any version of Hosted Exchange Server. Highly compatible software to export data to PDF file with entire email properties (To, Cc, Bcc, From, Subject, Date, etc.) and read/unread email status.

Supports All Versions of Outlook OST Files

Works efficiently with all OST files generated by any Outlook version, including Office 365, 2021, 2019, 2016, and previous versions. Use the OST file converter on any device with Windows OS version 365, 11, 10, 8.1, Windows Server 2022, 2019 & older versions.

Why Choose Kernel OST Converter Software?

Need a powerful and smooth Outlook OST converter tool for secure file conversion? Look at these specialties and capabilities which make our software the best and preferred for enterprise OST file conversion.

Adaptable to Your Needs

The Kernel OST Converter tool provides complete flexibility, ensuring compatibility with all versions of Outlook OST files without hassle. Along with this, it provides multiple options for saving OST data, so that you can choose them accordingly.

Reliable Performance

Kernel OST Converter is designed to give the desired results every time you use it. No matter whether the OST file is large, damaged, or inaccessible, the tool provides a smooth conversion process without errors. It keeps your OST data intact as the original.

Saves Time and Efforts

Efficiency is another reason to opt for the Kernel OST Converter tool. It handles multiple large OST files and converts quickly in one go. It saves effort and increases productivity, making the tool especially useful for businesses and individuals.

User-friendly Design

Simplicity is the strongest reason to consider Kernel OST Converter. It has a user-friendly interface, so even a novice can operate it without difficulty. It doesn’t require advanced expertise, which makes it a perfect solution for users at all levels.

What Customers are Saying About Kernel OST Converter Software

Ella Morris, Project Manager

“Thankful to Kernel OST Converter that helped me make an easy shift from Outlook to Thunderbird. I used the tool to convert my OST files to MBOX and then imported them into Thunderbird in just a few seconds. I am relieved that I chose this tool and saved my business emails and resources.”

Roscow D Turner, Business Owner

“I was worried when I couldn’t access some important emails due to OST file issues. Kernel OST Converter made the process smooth by quickly converting them into other file formats. Within a few minutes, I had all my data back in Outlook, and it felt like a lifesaver for my ongoing project.”

Daniel Kartos, Software Engineer

“Managing multiple OST files of numerous employees was becoming a real challenge. This tool helped me convert all of them simultaneously without any hassle. It saved me time and effort, and I could easily organise my company's communication without delays.”

Jack Edwards, HR Executive

“We had some orphaned OST files generated by Exchange Server 2016. Due to the inaccessibility of the OST files, we were unable to open our email communications. But thanks to this tool, which helped us export our OST files in Outlook and restored the communication.”

Rachel Nocane, IT Admin

“I needed to retrieve old OST file data containing important employee records. With Kernel OST Converter, the process was simple and quick. I extracted all emails and attachments without losing any data or hierarchy. I'm happy I relied on this software.”

Frequently Asked Questions

Check out the common user queries and their answers to understand all possible scenarios where our tool can be helpful to you.

How to convert an OST file?

Here’s a short process to understand how to convert OST files using our free OST converter tool:

Step 1: Install and launch the Kernel OST Converter software.
Step 2: Click Browse to add manually or use Search button to find & add OST files.
Step 3: Scan the OST file data and preview emails with attachments and properties.
Step 4: Select output file type and apply filters to export OST file data to the desired format.
Step 5: Provide file saving path and saving preferences to start the file conversion.

Can I export OST directly to cloud platforms?

Yes, you can export the OST files directly on the cloud platforms. Select the desired cloud app as the destination, and the tool will move OST files directly there.

How do you handle encrypted OST files?

Our tool is capable of handling S/MIME and OpenPGP encrypted OST files. You can add the encrypted OST files, and the tool will decrypt the files and then convert it to the selected format.

Is there an OST file size limit?

No, there is no limit on the size of OST files to add in the free OST converter tool. You can add OST files of size even more than 100+ GB to convert to other formats.

Can I view OST file content before conversion?

Yes, you can view OST files with a clear hierarchical preview before conversion with the free OST converter tool. You can click on the email item to get a detailed view in Single View or Advanced Properties View.

Can your tool preserve email formatting in PDF exports?

Yes, you can use this free OST converter software to convert OST files with preserved email formatting in PDF format. The structure, layout, formatting, email properties, hyperlinks, etc., all remain intact during the conversion process.

I have large OST files containing multiple mailbox folders. Can I convert one OST file to multiple PSTs with this tool?

Yes, use the ‘Split PST File after’ option within the tool to create multiple resultant files ranging from 1GB, 2GB, 3GB, etc., according to your requirements.

The workstation that has this OST converter installed is not connected to the Exchange Server. Will this tool still work?

Yes, to convert OST files generated by any Exchange version, there is no need of a connection with the server. Simply run this tool, add the desired OST files, and you can convert them in a few seconds.

Kernel OST Converter software Prerequisites & recommendations

About Software

Version: 21.1

Release Date: Jan 2021

License Type: Personal, Home, Corporate & Technician

Free Download

Version Support

MS Exchange Server: 2019, 2016, 2013, and earlier versions

MS Outlook: Office 365, 2021, 2019, 2016, and previous versions

Outlook Express: 6.0, 5.5, 5.0 and 4.0

System Requirements

Hard Disk: 50 MB of disk space

Memory: 128 MB Minimum

Processor: Intel® Pentium Processor compatible (x86, x64) or equivalent

Operating System: Windows 365, 11, 10, 8.1, and older versions, Windows Server 2022, 2019 & older versions

Installation Guide

User Manual

EULA

What’s New

Case Study

Software Features	Trial Version	Full Version
Convert OST to PDF, MSG, MBOX, EML, etc.	25 items per folder	Unlimited
Add multiple OST files
Import OST to Live Exchange, Lotus Domino, or Office 365
Migrate OST to email clients, such as Gmail, Yahoo, AOL, etc.
Extract deleted emails from OST
Migrate selective data using multiple filters
	Free Download	Upgrade $49