List of the Top 11 Free OST to PST Converter Software in 2025

WebbyAcad's PST converter tool efficiently transforms Outlook Personal Storage (PST files) into various other formats. It enables the recovery of emails, contacts, and calendars from PST files that may be damaged or hard to access. Additionally, the tool ensures that data integrity is preserved during conversions to formats such as EML, MSG, and MBOX, among others, making it a versatile solution for users dealing with PST file issues.

Aid4Mail, an advanced email processing solution from Switzerland, offers three distinct editions tailored to various needs. 1. The Converter edition efficiently collects and converts emails with precision and speed, accommodating all major email services such as Office 365, Gmail, and Yahoo! Mail, as well as various mailbox file formats like PST, OST, OLM, and mbox. This edition is highly regarded for its effectiveness in preparing emails for archival, eDiscovery, and forensic applications. 2. The Investigator edition enhances functionality with robust search capabilities that utilize Gmail and Microsoft 365 syntax, along with native pre-acquisition filters and Python scripting. Its forensic tools empower users to retrieve deleted or hidden emails and to handle damaged or unfamiliar email formats. 3. The Enterprise edition extends its features to include support for Google Vault, Mimecast, and Proofpoint exports, facilitating seamless migration of corporate emails to live accounts across platforms like IMAP, Microsoft 365, and Gmail. Additionally, this edition allows for smooth integration of its command-line interface with custom tools and offers flexible licensing arrangements, including installation on both servers and portable flash drives. With a user base that includes Fortune 500 companies, government entities, and legal experts globally, Aid4Mail has established itself as a trusted resource in the email processing field. Its adaptability and comprehensive features make it an essential tool for organizations dealing with large volumes of email data.

Transform your file conversion process seamlessly with the innovative OST to PST Converter tool, meticulously crafted to revive inaccessible and corrupted OST files. This powerful solution efficiently retrieves damaged components, including emails, tasks, contacts, and calendar entries. Since its launch, Regain Software has focused on offering a broad range of recovery and repair solutions tailored for email data, supporting businesses, IT professionals, and casual users in reclaiming lost emails and contacts. When faced with severely damaged OST files, the Regain OST Recovery Tool enables users to recover and export their data into multiple formats such as Outlook PST, EML, MSG, and HTML. Moreover, if your PST file has become compromised and you can't access your stored data, the Regain PST Recovery Tool is available to assist in recovering and converting numerous files into various formats, including EML, MSG, HTML, MBOX, and RTF. In addition, the tool simplifies the removal of duplicate data, allowing users to efficiently eliminate redundant items, such as duplicate emails, attachments, calendars, contacts, and notes, across single or multiple files. By constantly refining its offerings, Regain Software strives to improve the data recovery process for users, enhancing their workflows and overall productivity. With these powerful tools at your disposal, you'll find it easier than ever to manage and recover your critical email data.

Stellar Converter for OST is a sophisticated tool designed to transform inaccessible OST files into PST formats while ensuring flawless extraction of mailbox data. It offers features that allow users to split or compact the resulting PST file and facilitates direct exports to Live Exchange or Office 365, enhancing convenience and efficiency. This software proves invaluable in various scenarios, particularly when mailbox data needs to be retrieved from OST files after an Exchange user account has been removed. In cases where an Exchange user account has been deleted from Active Directory, it's impossible to recreate the OST files, making this converter essential. By converting inaccessible OST files, the Stellar tool helps users extract crucial mailbox items into a PST format seamlessly. Moreover, it becomes especially beneficial for migrating mailboxes that were deleted without any prior backup, ensuring that critical data is not lost. Ultimately, Stellar Converter for OST provides a reliable solution for effective data recovery and migration.

A highly effective and secure solution for exporting emails from mailbox data files into various formats is now accessible. The Email Converter empowers users to convert their email files into multiple formats simultaneously, including PST, MBOX, PDF, HTML, CSV, EML, ICS, vCard, and TEXT. This professional-grade application facilitates the conversion of emails from popular email clients and servers into a multitude of file formats. With its user-friendly interface and advanced filtering capabilities, users can effortlessly export their emails to their desired formats while safeguarding essential information from being lost. The Xtraxtor Email Converter guarantees a straightforward and precise conversion process, regardless of the number or size of the data files in question. Furthermore, this tool provides users with the flexibility to transfer and export their emails to different file formats based on their individual needs and chosen export options. Offering various saving formats such as PST, MBOX, OST, EML, MSG, HTML, CSV, PDF, TEXT, vCard, and ICS, it allows users to easily choose the appropriate file format for effective mailbox data preservation. In conclusion, this tool’s adaptability and extensive format options make it an indispensable asset for anyone aiming to manage their email data with efficiency and ease. Whether for personal use or professional tasks, the Email Converter stands out as a reliable choice for comprehensive email management.

PCDOTS presents an outstanding Email Converter Tool tailored for converting emails from prominent desktop email applications. This cutting-edge software allows users to change their emails into commonly used file formats while ensuring that all attachments are retained throughout the conversion process. If you're on the lookout for a reliable email conversion solution and have faced challenges in finding one, your quest concludes here. Don't wait any longer—download this premium mail converter today. The Email Converter software is designed to work with data files from all the leading email services, making it an adaptable option for users. Our expert team has meticulously examined and understood a wide array of email file types and their respective structures. Moreover, PCDOTS Email Conversion Freeware emerges as a refined choice for transferring emails to different file formats, making transitions smooth and hassle-free for users. This tool is crafted to effectively cater to your email conversion requirements, whether for personal use or professional endeavors, ensuring a user-friendly experience throughout the process. With its comprehensive features, this converter is an invaluable asset for anyone needing to manage their email data efficiently.

The OST migration tool is an outstanding solution, boasting a user-friendly graphical interface that appeals to both technical and non-technical users. It features an uncomplicated three-step process, allowing for the efficient conversion of multiple PST files into various formats at the same time, which users can easily select by holding the Ctrl key and clicking on their desired files. The OST Converter executes the entire migration rapidly, producing effective output files in just moments. Essentially, it facilitates the seamless conversion of OST files into numerous file formats, making it a versatile option for users. This powerful OST to PST converter is capable of managing large OST files and exporting them into PST format for Outlook in one streamlined operation. Throughout the migration process, users receive real-time progress updates that indicate how many files have been converted, which enables them to easily monitor the software's performance. Furthermore, the OST Converter runs smoothly while ensuring that all email and data attributes are preserved, guaranteeing a reliable and efficient migration experience. Users can trust this tool to maintain the integrity of their data while effortlessly simplifying the conversion process, which ultimately enhances their overall user experience during migration. This capability makes the tool an invaluable asset for anyone needing to convert OST files.

vMail OST-to-PST Converter Software serves as a versatile tool for converting and recovering emails from Microsoft Office Outlook's offline stored data. This application can retrieve emails, contacts, and calendar entries from damaged or encrypted OST files, subsequently exporting the entire dataset into a functional PST file. In addition to its primary function, this OST Converter software supports conversion to various formats, including MSG, MBOX, EML, EMLX, vCard, and vCal, allowing for greater flexibility in data management. Furthermore, users benefit from the simplicity of exporting their recovered information into a freshly created, healthy PST file, ensuring a seamless transition in their email data handling.

The premier OST to PST Converter software is designed to transform damaged or orphaned OST files into the Outlook PST format. Utilizing sophisticated algorithms, this software guarantees the safety and integrity of OST data throughout the conversion process. The OST Recovery tool efficiently exports all types of data from OST files, such as emails, calendars, contacts, notes, and journals, into the MS Outlook PST format. This streamlined migration solution enables users to transfer their Outlook OST mailbox data to PST format with just a single click. Notably, the OST to PST Converter boasts a range of advanced features, including the ability to perform bulk exports from OST to PST. It facilitates a rapid migration of Outlook data files into the PST format, making it incredibly user-friendly to convert OST to PST with minimal effort. Furthermore, it is compatible with all versions of MS Outlook and various Windows operating systems, supporting Windows 10, 8, 7, XP, and earlier versions as well. This versatility ensures that users can easily access their converted files regardless of their operating environment.

The Cigati OST-to-PST Converter is a highly efficient and sophisticated tool designed to convert Offline OST files into PST format, as well as other formats like MBOX, EML, and MSG. This utility is renowned for being the quickest and most reliable method for transforming OST files into Outlook PST files. It facilitates the transfer of various attachments including emails, calendars, contacts, and tasks seamlessly. Users can effortlessly convert their OST files into PST format while benefiting from enhanced features such as data integrity assurance and an auto-search function. The software ensures that the original hierarchy of items in your Office OST files is preserved during the conversion process. Furthermore, the Cigati OST Converter is capable of handling files in good condition and can also recover and convert corrupted OST files with remarkable accuracy. With its extensive capabilities, this utility empowers users to convert Offline OST files into PST or various other file formats with ease and efficiency. Overall, the versatility and security of the Cigati OST-to-PST Converter make it an invaluable tool for those needing reliable file conversion solutions.

Transform the manner in which you transfer, protect, and manage your data across various cloud services. With a client base exceeding 15 million, our solutions have earned the loyalty of a significant number of users who regularly select CloudMigration software as their go-to choice. Our comprehensive suite of migration tools addresses a wide range of requirements, making it the ideal solution for tasks like transferring Gmail to Yahoo or migrating Zoho Mail to iCloud. The proficiency of our software development team, which consists of experienced experts, guarantees the production of applications that are not only fast and effective but also exceptionally dependable, operating flawlessly on both Windows and Mac systems. Our offerings have been acknowledged by top IT brands as premier options for cloud migration, further enhancing our credibility. Moreover, partnerships with renowned companies like Dudley, Cisco, Capgemini, and Bupa reinforce our standing in the market. At CloudMigration, we are committed to the ongoing improvement of our software to adapt to the changing demands of our esteemed clients. We believe that innovation and user feedback are crucial in shaping the future of cloud migration solutions.