When using Microsoft Outlook, your mailbox data is stored in two types of files – OST (Offline Storage Table) and PST (Personal Storage Table). The OST file allows offline access to emails, but when Exchange Server becomes unavailable or your profile is deleted, the OST file becomes orphaned and inaccessible. To regain access to this data, users need to convert OST to PST.
There are many conversion tools available online, but not all provide reliable results. Below, we’ve listed the Top 10 OST to PST Converters in 2025, based on their performance, accuracy, features, and ease of use.
1. MailsDaddy OST to PST Converter – The Best Overall Solution
MailsDaddy OST to PST Converter is the most recommended and top-rated tool for converting OST files into PST and other popular formats like MBOX, EML, and MSG. It handles healthy, corrupted, and orphaned OST files with ease. The tool also ensures that the folder hierarchy, email properties, and metadata remain intact during conversion.
Key Features
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Converts OST to PST without Outlook installation
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Supports encrypted and large OST files
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Provides a detailed preview of mailbox data
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Allows selective conversion of items
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Supports all Outlook versions (2003–2021 & Office 365)
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Exports data to PST, MBOX, EML, MSG, and others
Pros
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Fast and secure processing
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User-friendly interface
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Multiple export formats
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Lifetime license with free updates
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Affordable for both individuals and businesses
Cons
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Free version allows limited export
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Desktop-based software only
Verdict
MailsDaddy OST to PST Converter stands out for its speed, accuracy, and reliability. It is an all-in-one solution suitable for beginners, professionals, and enterprise users.
2. Stellar OST to PST Converter
Stellar is a leading brand in data recovery and file conversion solutions. Its OST to PST Converter is widely recognized for deep scanning, high precision, and excellent recovery of deleted mailbox items.
Key Features
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Recovers and converts damaged or orphaned OST files
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Preview before saving
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Exports OST to PST, Office 365, and Live Exchange
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Supports bulk OST conversion
Pros
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Recovers deleted or lost items
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Intuitive GUI
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Reliable customer support
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Supports large OST files
Cons
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Higher pricing
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Requires Outlook installation for export
Verdict
Perfect for users looking for premium recovery features and excellent accuracy, but the pricing may not suit every budget.
3. SysTools OST to PST Converter
SysTools is another well-known name in the data migration industry. Its OST to PST converter supports batch file conversion, making it ideal for enterprise-level data migration.
Key Features
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Converts multiple OST files in one go
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Maintains original folder structure and metadata
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Allows splitting of large PST files
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Exports OST to PST, MSG, EML, HTML, and PDF
Pros
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Bulk conversion support
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Data integrity maintained
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Reliable and fast
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Various output formats
Cons
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Complex interface for new users
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Limited saving in demo version
Verdict
SysTools OST to PST Converter is an enterprise-grade tool suitable for IT professionals and system administrators.
4. Kernel for OST to PST Converter
Kernel is a strong competitor offering powerful features for data recovery and migration. It can restore data from encrypted or damaged OST files and export directly to Office 365 or Exchange.
Key Features
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Recovers and converts corrupted OST files
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Supports direct migration to Office 365 and Live Exchange
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Preserves all metadata
Pros
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Multiple saving options
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Fast and efficient recovery
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User-friendly interface
Cons
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Higher cost compared to others
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Demo version limitations
Verdict
Kernel OST to PST Converter is great for users needing both recovery and migration capabilities in a single solution.
5. Shoviv OST to PST Converter
Shoviv provides professional-level OST conversion with advanced features like batch processing and migration to cloud services. It is known for handling large OST files smoothly.
Key Features
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Converts OST to PST, EML, MSG
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Exports OST data directly to Exchange/Office 365
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Maintains data consistency
Pros
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Batch file conversion
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Direct migration options
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Reliable and accurate results
Cons
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Advanced features can be overwhelming for beginners
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Expensive for individual use
Verdict
Best suited for organizations that perform large-scale email migrations frequently.
6. Aryson OST to PST Converter
Aryson offers a cost-effective yet reliable tool for OST to PST conversion. It supports multiple output formats and works with both healthy and damaged OST files.
Key Features
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Converts OST to PST, EML, MBOX, PDF, MSG, and HTML
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Maintains folder hierarchy
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Allows selective export
Pros
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Affordable pricing
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Simple interface
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Multi-format conversion
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Compatible with all Outlook versions
Cons
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Limited advanced recovery features
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Demo version restrictions
Verdict
Aryson OST to PST Converter is ideal for home users and small businesses looking for an easy and affordable option.
7. Cigati OST to PST Converter
Cigati Software provides a secure and flexible conversion tool. Besides converting OST to PST, it also migrates data directly to Gmail, Yahoo, and other email clients.
Key Features
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Converts OST to PST, MBOX, EML, and PDF
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Direct cloud migration (Gmail, Yahoo, Thunderbird)
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Recovers data from corrupted OST
Pros
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Cloud migration support
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Fast performance
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Supports multiple formats
Cons
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Some features locked in premium plan
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Occasional lag with very large files
Verdict
Best choice for users looking for cloud-compatible OST conversion.
8. Softaken OST to PST Converter
Softaken provides a simple, easy-to-use interface for quick OST to PST conversion. It’s designed mainly for individual users and small-scale conversions.
Key Features
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Converts OST to PST and other formats
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Retains folder structure and attachments
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No Outlook installation required
Pros
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Affordable
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Lightweight and fast
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Works offline
Cons
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Outdated interface
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Lacks advanced enterprise features
Verdict
Softaken OST to PST Converter is a good pick for users who want a straightforward, low-cost conversion tool.
9. DataHelp OST to PST Converter
DataHelp Software offers a lightweight yet robust OST conversion tool. It is known for simplicity and efficiency.
Key Features
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Converts OST files quickly
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Preserves folder hierarchy
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Works on all Windows OS versions
Pros
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Easy-to-use interface
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Quick conversion speed
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Maintains data integrity
Cons
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Fewer customization options
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Limited customer support
Verdict
Ideal for users looking for a lightweight, reliable, and budget-friendly tool.
10. BitRecover OST to PST Wizard
BitRecover is another excellent OST converter offering strong file recovery capabilities and multiple export options.
Key Features
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Supports encrypted OST files
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Converts OST to PST, MSG, EML, and more
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Works offline
Pros
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Secure and stable conversion
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Selective data export
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Maintains metadata
Cons
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Slightly expensive
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Interface could be improved
Verdict
BitRecover OST to PST Wizard is a dependable option for users who value data security during migration.
Final Verdict: Which One is the Best?
While all these tools provide effective OST to PST conversion, MailsDaddy OST to PST Converter stands out as the best overall choice in 2025. It combines speed, accuracy, and affordability in one package. The software supports all types of OST files, maintains 100% data integrity, and doesn’t require Outlook installation.
Whether you’re a home user trying to recover personal emails or an IT administrator managing enterprise mailboxes, OST to PST Converter delivers the perfect balance of performance and simplicity.
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