Are you struggling to access your Outlook emails, contacts, or calendars because your OST files are corrupted or inaccessible? The OST to PST converter tool is the perfect solution to help you repair damaged OST files and safely convert them into PST format.
In 2025, both free and paid tools are at one’s fingertips, providing features that range from OST recovery to advanced enterprise-level OST file and cloud migrations.
However, choosing the right OST to PST converter can save you time, prevent data loss, and restore your entire Outlook mailbox efficiently. In this guide, we’ve listed the top 10 OST to PST converter tools, helping you make a wise choice for secure, fast, and complete Outlook data recovery.
List of 10 Free and Paid OST to PST Converter Tools in 2025
Here is a list of the most recommended and top-quality OST to PST converter tools that make the OST repair and recovery process smoother and easier. Go through the tools below and choose the one that fits your needs:
1. Kernel for OST to PST Converter
When you look for the best, most reliable and popular tool to repair and convert Outlook OST files in 2025, then Kernel for OST to PST Converter stands out. Even Microsoft MVPs recommend it for safe and effective OST to PST conversion. It works with healthy, corrupted, or orphaned OST files and saves them in formats like PST, MSG, EML, or MBOX. The tool is safe, easy to use, and ensures no data loss. It also offers features like preview, PST file splitting, deleted item recovery, filters, and direct migration to Office 365 or Exchange.
Free Version:
- Preview all OST data.
- Migrate 25 items per folder to the cloud platform.
- 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 a widely used tool in 2025 to open and convert Outlook OST files with ease. Whether the file is corrupted, orphaned, or working fine, this tool can quickly change it into formats like PST, MBOX, EML, PDF, or HTML. It keeps all emails safe, without losing the original folder hierarchy. You’ll also get extra features, including bulk file conversion, recovery of deleted emails, advanced filters, detailed file reports, and direct migration to Microsoft 365, Live Exchange, or IMAP.
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. MailsSoftware OST to PST Converter
MailsSoftware OST to PST Converter is a reliable tool that makes it simple to convert complete Outlook OST mailbox data. It restores emails, contacts, calendars, tasks, notes, and more into Outlook PST format without issues. The software handles large OST files smoothly, keeps the folder structure and properties intact, and offers a quick preview of mailbox items. It also supports multiple export formats like PST, MSG, EML, MBOX, and MHTML.
Free Version:
- Only preview the OST data.
Paid Version:
- Convert unlimited OST data.
4. SysTools OST to PST Converter
The SysTools OST to PST Converter is another trusted choice for users who need to restore and access OST data that has become corrupted, offline, or orphaned. The tool keeps metadata and folder order intact, supports bulk OST processing, and lets you export contacts as vCard and calendars as ICS. It also allows saving OST files to PST, MBOX, MSG, EML, or EMLX, along with exporting Hosted and Online Exchange OST files directly.
Free Version:
- Convert 25 items.
Paid Version:
- Convert unlimited OST data.
5. MailsDaddy OST to PST Converter
With MailsDaddy OST to PST Converter, you can easily restore data from damaged, orphaned, or inaccessible OST files. The tool allows you to save data in multiple formats, including PST, EML, MSG, and HTML. Instead of just converting, it also provides a live preview of mailbox items, making it easier to choose what you want to keep. For larger tasks, it supports bulk OST file migration while maintaining folder structure and data accuracy. In addition, you can directly move OST data to Office 365 or Live Exchange, making it a flexible option for both personal and business use.
Free Version:
- Process 20 items.
Paid Version:
- Process all OST data.
6. Stellar OST to PST Converter
When you need to handle important Outlook OST files, Stellar OST to PST Converter can be considered as another trustworthy solution. It can convert orphaned or inaccessible OST files into PST with complete accuracy, restoring emails, contacts, calendars, and attachments without losing any details. The software also supports encrypted OST files, preserves the original folder structure, auto-detects Outlook data files, and even migrates offline OST files directly to Microsoft 365 for smooth data access.
Free Version:
- Only preview the OST data.
Paid Version:
- Save unlimited OST data.
7. Shoviv OST to PST Converter
When it comes to recovering and converting OST files, Shoviv OST to PST Converter stands out for its simplicity and efficiency. The tool quickly restores all mailbox data and lets you save it in formats like PST, EML, MSG, or HTML. You can handle multiple OST files at once, apply filters to convert only what you need, preview emails before saving, and even migrate data directly to Office 365 or Live Exchange. Its incremental export feature makes managing large OST files easier and more convenient.
Free Version:
- Save 50 items per folder.
Paid Version:
- Save all OST data.
8. SysBud OST to PST Converter
The SYsBud OST to PST Converter is designed to safely convert OST files into PST format without risking data loss. Once converted, the PST file can be imported into any version of Microsoft Outlook, making it highly flexible. The tool has no file size limits, provides a clean interface for easy use, and preserves complete metadata. It also restores all mailbox items, including emails, calendars, contacts, notes, journals, tasks, and attachments.
Free Version:
- Convert 20 emails per folder.
Paid Version:
- Convert unlimited OST data.
9. DRS Convert OST to PST
If you have multiple OST files that you need to convert, DRS Convert OST to PST makes the process straightforward and stress-free. The tool handles both Windows and Mac systems and ensures that no data is lost during conversion. You can turn your OST files into PST, MBOX, EML, PDF, or HTML, decide whether to include attachments, and even remove duplicate emails to save time. It also supports direct migration to other email platforms, keeping all your folders and mailbox items organized and intact.
Free Version:
- Export 50 items per folder.
Paid Version:
- Export all OST data.
10. Softaken OST to PST Converter
Lastly, Softaken OST to PST Converter is a versatile tool that helps users convert offline OST files, including damaged, orphaned, or encrypted ones, into PST and multiple other formats such as PDF, MBOX, EML, MSG, and even Office 365. It ensures complete data integrity throughout the process, supports bulk file conversion, and allows users to preview mailbox data before saving. With advanced filters for selective export, it works smoothly across all Outlook and Windows versions.
Free Version:
- Processes 25 items.
Paid Version:
- Processes unlimited OST data.
Parameters to Choose the Right OST to PST Converter
Choosing the ideal OST to PST converter may be confusing because every tool comes with its own special features and capabilities. If you are looking for assistance, follow the points below to choose the right OST to PST converter tool:
- Test the effectiveness and accuracy using the free trial of the tool.
- Ensure the tool preserves emails, attachments, and folder structure.
- If you have large OST files, choose a tool that can handle them.
- Look for a simple interface if you are a novice or not very technical.
- Batch conversion and preview options should be embedded with the tool.
- Paid tools often provide dedicated support in case of issues.
- If opting for paid tools, make sure the tool has the required features and cost-effectiveness.
Conclusion
You’ve understood all the top 10 free and paid OST to PST converter tools in 2025 along with their features and capabilities. In the list, every tool has its own potential, allowing you to fulfill your OST to PST conversion needs.
Whether you choose a free tool for limited OST file conversions or a paid solution for unlimited conversion and advanced features, always back up your OST files first. If you still have concerns, go with the tools like Kernel for OST to PST Converter and Recoveryfix OST to PST Converter.
They provide reliability and full mailbox recovery, making them top choices for both businesses and individual users in 2025. For hands-on experience, download the free trial version now!!!
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