Top 10 Best OST to PST Converter Software[2024]

Microsoft does not provide any specialized tool to convert Outlook OST file to PST format, besides an option (Import/Export wizard) in Outlook to export mailbox data from OST file to PST. However, this option doesn’t work when the Outlook profile or OST file is not accessible. This is where an OST to PST converter software is required. An OST to PST converter software can easily convert an OST file even when Outlook can’t be accessed, displays an OST file error, or Outlook profile is deleted/disabled from the server.

However, there are several OST to PST converter software available in the market. Sometimes, it becomes difficult to decide as every software claims to be the best one. Therefore, in this article, we’ve discussed 10 best OST to PST converter software for Windows, based on their features and performance to help you choose the one that is suitable for your OST to PST conversion needs.

10 Best OST to PST Converter Software   

Below we have discussed the 10 best OST to PST converter software.

Here’s is a list of 10 best OST to PST converter software, along with their features, and pros and cons.

1. Stellar Converter for OST

Stellar Converter for OST is one of the best and most highly rated OST to PST converter software. It is trusted and recommended by Microsoft MVPs and IT admins to convert orphaned and inaccessible OST files to PST and other formats. It helps you extract the mailbox items from Outlook OST with 100% precision and integrity. It also recovers deleted and lost mailbox items, such as emails, attachments, contacts, calendar items, etc. The software converts multiple OST files to PST without any file size limit. It helps users migrate their OST mailbox items to different platforms, such as Outlook, Office 365, and live Exchange.

Features

• Converts inaccessible, encrypted, and orphaned OST files to PST format
• Extracts all OST mailbox components, such as emails, attachments, contacts, calendar entries, notes, journals, etc.
• Converts OST file of any size
• Recovers deleted mailbox items and highlights them with red color
• Batch conversion option to convert multiple OST files to PST files at once
• Advanced filters to convert selective emails or messages from OST file, based on ‘To’, ‘From’, ‘Subject’, and ‘Date’
• Provides preview of mailbox items in a three-tier structure after conversion
• Multiple saving options, such as PST, EML, MSG, PDF, RTF, and HTML
• Exports OST file to Office 365 account or live Exchange Server directly (Technician version)
• Option to export Contacts as CSV in just one-click (Technician version)
• Option to split the converted OST file while saving it as PST
• Option to Compact converted PST file to save storage space
• Supports Outlook 2003, 2007, 2010, 2013, 2016, 2019, 2021, and Outlook 365
• Compatible with Windows 7, 8, 8.1, and 10

Pros

• Ensures 100% data integrity during conversion
• Faster OST to PST conversion
• Supports conversion to multiple file formats
• Easy-to-use interface suitable for all users
• 24/5 support for technical assistance
• Demo version available to preview converted items

Cons

• Demo (free) version saves only 20 items per mail folder to PST. But it allows to preview all OST mailbox items for free after conversion.

Editions and Pricing

• Corporate Edition
  $79 for one year license and supports conversion of up to 5 mailboxes
• Technician Edition
  Converts OST file to PST + Batch Conversion + Split + Compact PST files + Export to Office 365. Supports unlimited mailboxes and costs $149 for 1 year and $249 for lifetime license.
• Toolkit Edition
  8-in-1 software-suite to Convert OST, Repair, Split, Compact, and Merge PST, DeDuplicate Mail Items, Undelete Mail Items, and Reset Outlook Password. Supports unlimited mailboxes and costs $199 for 1 year and $299 for lifetime license.

User Testimonials

• We have deleted a user’s ID before taking the backup. The OST cannot be accessible from Outlook. This is the only tool that helps access that OST and convert it to PST. – Vinayak K.
• Understanding the software was relatively easy. It easily recognized the contents of OST file. After the scan, I was able to view each and every mail items of the OST file.

I was quite satisfied with the scan results so I went ahead and bought the Corporate Version of the software. I think it is worth it. After the recovery, I had my complete OST data converted to PST format. — Verified User in E-Learning

Expert Opinion

“Stellar Converter for OST is one of the best tools in the market today for converting OST files into PST and other formats. Highly recommended for anyone needing to extract data from orphaned or inaccessible OST files.”

2. Advik OST to PST Converter

Advik OST to PST Converter is an advanced software that quickly converts OST file to PST format. Besides PST, it also saves the OST file data to MSG, MBOX, PDF, EML, TGZ, DOC, and several other file formats.

Features

• Converts OST file into PST without any file size limit
• Supports OST file created in Outlook 2019, 2016, 2013, and earlier versions
• Maintains the OST mailbox folder hierarchy and metadata
• Multiple output file format support
• Repairs damaged OST file
• Exports OST data to Office 365
• Batch Conversion option to convert multiple OST files to PST
• Converts encrypted OST file
• Compatible with Windows 10, 8.1, 8, 7, and older versions

Pros

• Converts OST files into multiple formats, providing flexibility
• Easy to navigate interface, making it accessible for all users
• Offers free lifetime updates and 24/7 customer support

Cons

• Compact PST option is not available
• No option to export OST to live Exchange or existing Outlook profile

Editions and Pricing

• Personal License: $49
• Business License: $69
• Migration License: $129

User Testimonials

• I am not a technical guy but Kevin helped me out in extracting data from damaged Outlook OST file using Advik OST Converter. – Sanjay Singh

Expert Opinion

“Advik OST to PST Converter offers a comprehensive solution for users needing multiple format support. Its ease of use and lifetime updates make it a valuable tool.”​

3. SysTools OST to PST Converter

SysTools OST to PST converter is another popular OST converter software that converts OST files of Outlook 2019, 2016, 2013, 2010, and below versions to PST format. The software can convert also multiple OST files to PST. It supports encrypted and orphaned OST file conversion. You can use the software to convert, export, and backup OST mailbox data to PST and other formats, such as HTML, EML, MSG, and Office 365.

Features

• Converts Outlook OST files to PST, EML, MSG, HTML, and PDF formats
• Converts inaccessible or orphaned OST files to PST
• Supports conversion of large OST files
• Supports Batch Conversion to convert multiple OSTs to PSTs
• Decrypts encrypted Outlook OST emails and removes S/MIME and OpenPGP encryption
• Supports Outlook 2003, 2007, 2010, 2013, 2016, 2019, and 2021
• Compatible with Windows 10, 8.1, 8, 7, and below versions

Pros

• Converts OST files with high accuracy and maintains data integrity
• Simple and intuitive interface, suitable for users of all skill levels
• Offers professional support

Cons

• Requires .NET framework 4.5 to avoid compatibility issues
• No option to compact PST file

Editions and Pricing

• Full Version License: $49
• Business License: $229
• Enterprise License: $999

User Testimonials

• It runs with all Windows platforms including Windows 8.1 and supports all Outlook editions including 2013. User can easily restore deleted emails from unusable or unreadable Exchange OST file and save it into PST file format with all email properties. On the crashed Exchange Server or without Exchange Server environment, user can successfully restore emails from OST file as well as without Outlook application too. — Dorris M
• The technical support is AMAZING!!! Even if the response time is sometimes minutes away, the support team is very dedicated and they do everything to make your app work. The application works just great, but the Office 365 tenant setup is quite difficult to prepare. But the overall experience is quite pleasant. — Sergiu Ghenov.

Expert Opinion

• “SysTools OST to PST Converter is a reliable choice for IT professionals. Its advanced features and robust support make it a standout option.”

4. SysInfo OST to PST Converter

SysInfo OST to PST converter is one of the best tools to quickly convert OST files to PST and other file formats, such as DBX, MBOX, EML, MSG, and Archive. The software also repairs damaged or corrupted Exchange or IMAP Outlook OST files. You can also convert password-protected OST files to PST.

Features

• Converts OST to PST, DBX, MBOX, MSG, EML, and Archive formats
• Converts all OST mailbox items, such as emails, journals, task, to-do, etc.
• Converts damaged or corrupt OST files
• Previews mailbox items before saving
• Supports password-protected or encrypted OST files
• Supports OST file of any size
• Provides status report of OST to PST conversion
• Converts OST to PST with precision and accuracy
• Option to exclude emails by using various filters
• Supports bulk OST file conversion

Pros

• Converts OST files with high accuracy and maintains data integrity
• Easy-to-use interface suitable for both beginners and experienced users
• Competitive pricing

Cons

• No option to export OST data to Office 365 and live Exchange
• Limited output file format options
• No option to compact PST file

Editions and Pricing

• Single User License: $69
• Administrator License: $219
• Technician License: $319
• Enterprise License: $419

User Testimonials

• SysInfo provides exceptional tech support. Shubham spent a lot of time trying to determine the reason why the duplicate remover did not generate the output file. He uploaded my PST file, which was huge, with the intention to run the software on this file to determine what has happened. I have never experienced so much dedication of any tech support person to resolve a difficult issue. I am very grateful to Shubham for his help. — Gregory Kielczewski

Expert Opinion

• “SysInfo OST to PST Converter is a great option for users needing high precision and reliability. Its affordability makes it accessible to a wide range of users.”​

5. Offline OST to PST Converter

Offline OST to PST Converter is also a reliable OST to PST converter software which is available for Windows. The software converts Outlook OST to PST, MSG, EML, VCF, and TXT formats. It extracts emails, tasks, journals, notes, contacts, events, calendars, etc. from OST file and saves them to Outlook importable PST format.

Features

• Converts OST to PST locally without internet access
• Supports orphaned, inaccessible, and password-protected OST files
• Converts OST files of any size
• Previews OST mailbox items after conversion
• Converts OST files in ANSI (Outlook 97…2003) and UNICODE (Outlook 2007 and later) formats
• Extracts data from damaged OST files

Pros

• Converts files locally without internet dependency
• Simple and easy to use interface
• Competitive pricing

Cons

• No option to split or compact PST files
• Slower scanning process
• No option to export OST data to Office 365 and live Exchange
• Batch conversion is not available

Editions and Pricing

• Personal License: $39
• Business License: $59
• Site License: $99

User Testimonials

• Not Available

Expert Opinion

• “Offline OST to PST Converter is perfect for users needing a simple, no-frills solution. Its offline capability is a major advantage.”

6. Aryson OST to PST Converter

Aryson OST to PST Converter is another reliable software that can quickly convert OST to Outlook PST. It also exports OST emails to Windows Live Mail (EML) and Thunderbird mail (MBOX). It can also handle severely corrupt OST files. The software maintains data accuracy and integrity during conversion.

Features

• Easily converts OST file to PST, EML, MSG, MBOX, and CSV formats
• Intuitive and user-friendly interface
• Allows users to find and locate Offline OST files
• Previews OST file data after conversion
• Compatible with all MS Outlook versions and Window OS

Pros

• Converts OST files into various formats with ease
• Offers features like email filtering and date-based conversion
• Supports both Windows and Mac platforms

Cons

• Demo version converts OST to EML format only
• No option to export OST files to Office 365 and live Exchange
• Does not recover deleted items

Editions and Pricing

• Single User License: $49
• Administrator License: $199
• Technician License: $299
• Enterprise License: $399

User Testimonials

• Tried their OST to PST converter software, works as designed, support is helpful and very prompt. I had a little issue with the license, but the support staff resolved it very fast and professionally. Software significantly cheaper than other options I’ve considered before buying this one. I would recommend. — Krzysztof Beszterda
• Reached out to support and they were prompt and provided great customer service. The software is really great and worked well to convert my OST to PST. —Jeff

Expert Opinion

• “Aryson OST to PST Converter is a versatile tool with advanced features. Its wide compatibility and ease of use make it a standout choice.”

7. BitRecover OST to PST Converter

BitRecover OST to PST Converter is another advanced OST to PST converter software. It converts inaccessible or orphaned OST file to PST while maintaining data integrity and accuracy during conversion. It features advanced algorithms and ensures no data loss during the conversion process.

Features

• Converts OST to PST without any size limit
• Saves attachments to PST file after OST conversion
• Exports OST file directly to Office 365, Outlook 2019, 2016, 2013, 2010, 2007, 2003, 2002, and 2000 profiles
• Supports encrypted, compressed, password-protected, and damaged OST files
• Splits converted PST files into 2 GB, 5 GB, and 10 GB sizes
• Recovery Mode option to convert corrupt OST files to PST

Pros

• Offers a wide range of output formats
• Converts large OST files quickly and efficiently
• Maintains data integrity and security during conversion

Cons

• No option to compress or compact PST files
• Limited number of supported output file formats

Editions and Pricing

• Single User License: $39
• Pro License: $49
• Migration License: $99

User Testimonials

• The support provided solution to the problem we presented and they were very nice and professional all the time. —Roland Giménez Gutiérrez
• The technician who assisted me, Peter, did an outstanding job solving a difficult problem (for me). I could never have done this without his help. 5 stars. —Lloyd

Expert Opinion

• “BitRecover OST to PST Converter offers robust performance and security, making it a top choice for IT professionals.”

8. Kernel for OST to PST Converter

Kernel OST to PST Converter is another reliable OST converter software for Windows that helps Outlook users to convert OST files to PST format. It retrieves user mailboxes from orphaned or inaccessible OST files and helps to migrate mailboxes to different email clients.

Features

• Converts OST to PST with accuracy
• Recovers lost or permanently deleted Outlook mailbox items
• Migrates Exchange emails to Gmail/Outlook.com accounts
• Advanced filters to filter mailbox items based on item type, date range, folder name, etc.
• Generates a graphical report after OST to PST conversion

Pros

• Maintains data integrity and folder hierarchy during conversion
• Offers filters for selective conversion based on criteria, like date and item type
• Migrates OST files to web-based email clients

Cons

• Most features are available only in paid versions
• No option to compact or split PST

Editions and Pricing

• Personal License: $49
• Home License: $99
• Corporate License: $199
• Technician License: $299

User Testimonials

• Excellent program for recovering and converting OST files to PST. Kernel for OST to PST Converter has consistently recovered and converted my OST files without any issues. Its efficacy makes light work of complex data management duties. — Jacob S
• Kernel has a great product and an excellent support team. When I was having problems importing the converted OST file and viewing it in Outlook, they did a Zoom call with me and had me download tool. All of this was for the free version! Their chat is also excellent and very responsive as is their call line. Very rare these days to get multiple ways to access support–all delivering the highest quality. I wish other software companies were this good! —Deborah McCochie

Expert Opinion

• “Kernel for OST to PST Converter offers advanced features for precise conversions. Its detailed reporting makes it a valuable tool for IT professionals.”

9. ZOOK OST to PST Converter

ZOOK OST to PST Converter is one of the best tools to extract and export offline OST mailbox data to PST format. It helps migrate Exchange or IMAP Outlook OST to PST format. The tool also helps you access and convert orphaned or inaccessible OST to PST format in a few clicks.

Features

• Helps migrate emails, contacts, calendars, notes, etc. from OST to PST format
• Batch conversion for multiple OST files conversion
• Works without Microsoft Outlook
• Maintains Meta-Properties and RTF Structure of emails during conversion
• Converts orphaned, corrupt, inaccessible, crashed, or cached OST file to PST
• Supports all Outlook versions
• Option to split large-sized OST files into multiple small PST files
• Merges OST mailbox data to an existing PST

Pros

• Easy to use interface, even for beginners
• Converts files quickly and maintains data integrity
• Offers competitive pricing for its features

Cons

• Supports only a few output file formats
• Basic OST recovery features

Editions and Pricing

• Single User License: $49
• Corporate License: $199

User Testimonials

• It easily exported large sized OST to PST format in few seconds. It is easy to use and migrated my OST data into PST format. —Nitin K
• I found it to be very useful brand!!! It contains each type of email conversion solution and email backup software. I’ll name it as One Stop solution. —Pamela Scout

Expert Opinion

• “ZOOK OST to PST Converter is ideal for users needing batch conversion without Outlook dependency. Its simplicity makes it accessible to all users.”

10. Shoviv OST to PST Converter

Shoviv OST to PST Converter recovers inaccessible and corrupt OST mailbox items and converts them to PST file. The software also converts OST to HTML, EML, vCal, and vCard formats. It recovers lost or deleted mail items during conversion. It can also export the OST file to Office 365. It can convert OST file of any size and split the converted PST file while saving.

Features

• Quickly converts OST files to PST format
• Recovers hardly deleted OST files
• Converts single or multiple OST files without any file size restriction
• Previews OST items before saving to PST
• Maintains the hierarchy of the folder and data integrity
• Supports all Outlook versions and Windows OS
• Option to search OST items via specific field name
• Option to save OST files in various file formats, such as HTML, EML, vCal, vCard, MSG, etc.
• Allows to export OST mailbox items to Office 365
• Option to split PST file while saving

Pros

• Converts large OST files without any size restrictions
• Offers a wide range of output file formats
• Maintains folder hierarchy and metadata

Cons

• No support for Office 2019 version
• Does not convert encrypted OST files
• Does not distinguish the deleted items

Editions and Pricing

• Single User License: $49
• Standard License: $99
• Corporate License: $199
• Technical License: $299
• Enterprise License: $499

User Testimonials

• I am highly impressed with the working of the software. It successfully converted my OST to PST in a hassle-free manner. Anyone can easily convert OST to PST file format without any pre technical knowledge. – David Edwards
• Well, my decision was not wrong. I went with Shoviv OST to PST Converter to fix my OST file issues and it worked like a master. The software is very easy to understand and offers numerous functionalities. It offered me to convert OST to PST file in a professional way. —Mathhew Graf

Expert Opinion

• “Shoviv OST to PST Converter is a reliable tool for businesses needing multi-format support and robust conversion capabilities. Its ease of use makes it accessible to all users.”

Conclusion

You can choose any of the above given OST to PST Converter software as per your requirements. These software can help you convert OST files of any size to PST and various other formats. These software can help you resolve Outlook errors, recover lost or deleted emails, and import OST mailbox into Office 365, existing Outlook profile, or live Exchange directly. Out of these, Stellar Converter for OST is the best OST to PST software. It is often recommended by several MVPs and admins across the globe. There’s also a study conducted on OST to PST converter software in which Stellar Converter for OST outperformed all the other OST converter software in the industry on several parameters.

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About The Author

Ravi Singh

Ravi Singh is a Senior Writer at Stellar®. He is an expert Tech Explainer, IoT enthusiast, and a passionate nerd with over 7 years of experience in technical writing. He writes about Microsoft Exchange, Microsoft 365, Email Migration, Linux, Windows, Mac, DIY Tech, and Smart Home. Ravi spends most of his weekends working with IoT (DIY Smart Home) devices and playing Overwatch. He is also a solo traveler who loves hiking and exploring new trails.