Imagine you’ve just switched your job and want to back up your essential Outlook email. But when you try to open your mailboxes, Outlook says, “Profile not available” or “Cannot open your default email address.” Now, you can’t access your old emails or other data. This situation is so annoying, but there is a solution. You need to convert the OST file to PST converter tools immediately!!
When your OST file is corrupt/damaged, you can’t reaccess it without proper repair/recovery. There are no manual methods to deal with such issues, so professional third-party OST converter tools come in handy. In 2025, there are many advanced automated OST to PST converters (free and paid) that convert OST to PST in just a few clicks.
In this blog, we will discuss the 10 best OST to PST converter tools that help users in situations just like yours. Whether you are an IT admin, professional, or student, these tools will help you to back up or maintain your normal Outlook workflow. Take these top OST to PST converter tools into consideration when you need to access, migrate, or backup OST files without any hassle!!!
Top Recommended OST to PST Converter Tools in 2025
Whether you access, backup, or migrate OST files, the tools listed below are top-rated and most recommended by professionals. Here is a brief overview of each tool; understand and pick them according to your requirements.
1. Kernel for OST to PST Converter
In 2025, the Kernel OST to PST Converter is the most recommended tool to backup and migrate corrupted/healthy/orphaned OST files. It quickly converts OST files into secure formats like PST, MSG, EML, MBOX, etc. Equipped with numerous features and capabilities, it makes your OST conversion smooth, easy, and secure effectively. Moreover, it offers a free trial version with limited features, but you need to buy it for all its features and capabilities.
Other top-quality features of the tool are:
- Secure, handy tool with a zero data loss guarantee.
- Split the resultant PST file into multiple smaller PSTs.
- Recover permanently deleted items with OST and other data.
- No file size restrictions, and it supports batch OST conversion.
- Snapshot feature to customize the OST conversion accordingly.
- Provide numerous advanced filters for specific OST file conversion.
- Facilitate a Preview feature to view mailbox emails or other data.
- Preserve original mailbox folder hierarchy, metadata, and properties.
- Migrate OST files to Office 365, Hosted Exchange, or IMAP servers directly.
Free Version:
- Preview all OST data.
- Convert 25 items per folder to PST, MSG, EML, PDF, etc.
Paid Version:
- Convert unlimited OST data to multiple formats.
- Export unlimited OST data to multiple platforms and servers.
2. Recoveryfix OST to PST Converter
Recoveryfix OST to PST Converter is another leading software for accessing and converting OST files. It also converts corrupted, healthy, or orphaned OST files into several files like PST, MBOX, EML, PDF, HTML, etc., in a few clicks. This tool retains the complete OST data and guarantees zero data loss and no formatting issues. You can try it for free, but it requires a purchase to unlock its full version.
Other highlights of the tool are:
- Restore mistakenly deleted OST data.
- Recover all OST data with full accuracy.
- Convert multiple OST files of any size at once.
- Smart filters for selective OST data conversion.
- Generate a graphical file analysis report of OST files.
- Migrate OST files to Live Exchange, Microsoft 365, and IMAP servers.
Free Version:
- Open/read the entire OST data.
- Save 25 items per folder to PST.
- Migrate 25 items per folder to Office 365.
Paid Version:
- Convert limitless OST files.
- Migrate limitless OST files.
3. Shoviv OST to PST Converter
The Shoviv OST to PST Converter Tool is another easy-to-use and result-oriented tool for OST conversion. It recovers all OST file data and saves it in different formats like PST, EML, MSG, HTML, etc., quickly.
Other prominent features of the tool are:
- Convert multiple OST files without loss.
- Various filters for selective data conversion.
- Provides Preview option to open/read OST items.
- Migrate OST files to Office 365 and Live Exchange.
- Facilitate the incremental export feature to convert OST files conveniently.
Free Version:
- Save 50 items per folder.
Paid Version:
- Save all OST data.
4. DRS Convert OST to PST
The DRS Convert OST to PST is also a widely used tool for Outlook OST file conversion without data loss. Embedded with advanced features and capabilities, it makes the OST conversion process smooth, quick, and error-free. It has separate versions for broader compatibility with Windows OS and Mac OS.
Advanced features of the tool are:
- Convert multiple bulk OST files simultaneously.
- Convert OST files to PST, MBOX, EML, PDF, HTML, etc.
- Feature to save emails with or without attachment files.
- Migrate OST to various email clients and servers directly.
- Option to remove duplicate items for precise and time-saving conversion.
Free Version:
- Export 50 items per folder.
Paid Version:
- Export all OST data.
5. MailsDaddy OST to PST Converter
The MailsDaddy OST to PST Converter is another reliable and effortless tool to convert orphaned/corrupted OST files. It saves OST data in PST, EML, MSG, HTML, etc., within a minute. Its simple interface and functional features make it one of the most recommended tools for OST conversion.
Other highlights of the tool are:
- Provide a clear preview of OST data.
- Multiple helpful filters for selective conversion
- Perform bulk OST file conversion simultaneously.
- Preserve the original folder structure and hierarchy.
- Migrate OST files to Office 365 & Live Exchange Server.
Free Version:
- Process 20 items.
Paid Version:
- Process all OST data.
6. Softaken OST to PST Converter
Softaken OST to PST Converter is a powerful utility that converts offline Outlook OST files, including corrupted ones, into PST and other formats like PDF, MBOX, EML, MSG, and Office 365. It preserves data integrity, supports batch processing, and offers preview before conversion.
Key Features of the tool are:
- Extract emails.
- Selective conversion and advanced filters
- Convert corrupted or orphaned OST files
- Supports all Outlook and Windows versions.
- Recover password-protected (encrypted) OST files.
Free Version:
- Processes 25 items.
Paid Version:
- Processes unlimited OST data.
7. SysBud OST to PST Converter
SysBud OST to PST Converter tool effectively recovers OST files and converts them into PST file format without any data loss. It provides a compatible PST file that users can easily import into the entire MS Outlook edition.
Helpful features of the tool are:
- No file size limitation to export OST to PST.
- Maintains metadata, like To, Cc, Bcc, From, Time, Date, etc.
- Easy and intuitive user interface for quick migration.
- Recover all mailbox data, like emails, notes, tasks, contacts, calendars, journals, attachments, etc.
Free Version:
- Convert 20 emails per folder.
Paid Version:
- Convert unlimited OST data.
8. Steller OST to PST Converter Tool
Stellar OST to PST Converter is one of the best reliable software to be trusted with your important OST data. It converts orphaned OST files to PST, including emails, attachments, contacts, and calendars, with 100% accuracy. The tool offers all the conversion facilities you can expect in any software.
Features of the tool are:
- Convert encrypted OST files.
- Preserves original folder hierarchy.
- Auto-locates and lists Outlook data files.
- Migrate offline OST files to Microsoft 365.
Free Version:
- Only preview the OST data.
Paid Version:
- Save unlimited OST data.
9. MailsSoftware OST to PST Converter
MailsSoftware OST to PST Converter is an outstanding solution for easily converting entire OST file mailbox data. It recovers all emails, contacts, calendars, attachments, tasks, notes, journals, etc., into Outlook PST format. It is also equipped with many features and capabilities, making it a smoother and reliable tool to convert OST to PST format.
Features of the tool are:
- No limitation on OST file size.
- Maintains the mail properties and folder hierarchy.
- Quickly scans the OST file and generates a complete preview.
- Convert OST to PST, MSG, EML, MBOX, and MHTML formats.
Free Version:
- Only preview the OST data.
Paid Version:
- Convert unlimited OST data.
10. SysTools OST to PST Converter
Lastly, SysTools OST to PST Converter software is best for converting inaccessible, corrupted, offline, and orphaned OST to PST file format. Many Microsoft MVPs recommend this tool to convert OST to PST format. It also has many advanced features and capabilities that make the conversion smooth and reliable.
Features of the tool are:
- Preserve metadata and hierarchy.
- Process multiple OST Files into PST.
- Export Contacts into vCard and Calendars in ICS.
- Convert OST Files into PST, MBOX, MSG, EML, EMLX, etc.
- Save Hosted Exchange and Online Exchange OST Files to PST.
Free Version:
- Convert 25 items.
Paid Version:
- Convert unlimited OST data.
Wrapping Up
Whether your Outlook crashed or your email account changed, losing your Outlook data can be a real headache. So, these best OST to PST converter tools are reliable for secure and effective OST recovery in 2025. Every tool has its own strengths and features. Some are better for large files and bulk conversion, and others are better for quick conversions.
So, choose the tool according to your needs, such as speed, accuracy, migration facility, compatibility, and smoothness. As per our recommendation, we’d suggest Kernel OST Convertertool. It is the best tool with multiple advanced and valuable features for quick, smooth, secure, and accurate OST conversion. So, use the free trial version to evaluate its effectiveness. Download now!!