Top 5 OST to PST Converter Tools in 2025 – Complete Review

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If you’ve ever faced issues with inaccessible or orphaned Outlook OST files, converting them to PST is often the only reliable solution. OST to PST conversion helps you regain access to emails, contacts, attachments, calendars, and other mailbox components even when Exchange Server is down or unavailable. Today, we bring you a list of the Top 5 OST to PST Converter Tools that stand out in 2025, with MailsDaddy OST to PST Converter leading the pack for its performance, accuracy, and user-friendliness.

1. MailsDaddy OST to PST Converter – Best Overall Tool

Website: Easily Convert OST to PST — Best OST to PST Converter

Why It Stands Out:
MailsDaddy OST to PST Converter is widely acclaimed as one of the most powerful and dependable tools for converting OST files into PST format. It ensures the complete recovery of OST mailbox data including emails, contacts, calendars, tasks, notes, and journals. The software maintains the original folder structure and formatting during the conversion process.

Key Features:

• Supports conversion of corrupted, orphaned, and encrypted OST files.
• Preserves original metadata, formatting, and hierarchy.
• Offers a preview of all OST items before conversion.
• Supports batch OST to PST conversion.
• Export options to MSG, EML, MBOX, RTF, HTML, and more.
• Compatible with all Outlook versions including 2021, 2019, 2016, etc.
• Simple, intuitive GUI for non-technical users.

Why It's the Best:
Unlike many other tools, MailsDaddy doesn't require Exchange Server or Outlook installation. It also handles large OST files with ease and provides multiple export formats, making it highly versatile. Its precision, speed, and robust features make it the most reliable choice in the market.

2. Stellar Converter for OST​

Stellar OST to PST Converter is another trusted solution offering high-speed conversion with a simple interface. It recovers all mailbox items from inaccessible OST files and saves them into new PSTs.

Pros:

• User-friendly interface.
• Supports encrypted and oversized OST files.
• Option to directly export to Office 365.

Cons:

• Full version required for saving files.
• Comparatively more expensive.

3. SysTools OST Recovery and Converter​

SysTools OST to PST Converter is suitable for professionals and IT admins. It handles bulk OST file conversion efficiently and offers advanced filters for selective export.

Pros:

• Batch conversion feature.
• Preserves folder structure and data integrity.
• Converts emails, contacts, calendars, and journals.

Cons:

• Interface could be more modern.
• Slow with very large files.

4. Kernel for OST to PST Converter​

Kernel's OST to PST tool has been a reliable choice for years. It focuses on maintaining original data hierarchy and ensures no data loss during conversion.

Pros:

• Recovers data from orphaned OST files.
• Saves converted data to PST and other formats.
• Supports Office 365 migration.

Cons:

• No free saving option in demo version.
• Slightly steeper learning curve for beginners.

5. Shoviv OST to PST Converter​

Shoviv offers a solid OST converter with a range of functionalities including Outlook profile export, large OST file handling, and Office 365/Exchange migration.

Pros:

• Fast and accurate conversions.
• Supports Unicode and ANSI OST files.
• Exports directly to Live Exchange & Office 365.

Cons:

• UI not as intuitive as MailsDaddy or Stellar.
• Feature-rich but might be overwhelming for casual users.

Conclusion:​

When choosing the best OST to PST converter, MailsDaddy clearly leads with its performance, simplicity, and comprehensive feature set. Whether you're a home user or an IT admin, its powerful capabilities and smooth conversion process make it an essential tool for recovering or migrating Outlook data. The other tools listed are also excellent, but in terms of all-around value, MailsDaddy OST to PST Converter remains the top recommendation for 2025.