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We take your data safety seriously. Softonic has thoroughly scanned our installer and confirmed it’s completely clean and safe for your system.
View Softonic ReportSee why manual export can be risky and time-consuming compared to a dedicated recovery workflow.
| Scenario | Manual Method (Outlook) | Softaken Software |
|---|---|---|
| Data Risk | ❌ High (corruption chance) | ✅ Zero (safe workflow) |
| Outlook Required? | ❌ Yes | ✅ No |
| Orphaned/Offline Files | ❌ Not possible | ✅ Fully supported |
| Technical Skill | ❌ Expert required | ✅ Simple 3-step process |
Data loss is scary. That’s why we built a deep-scan engine that looks into every sector of your OST file so not a single email is left behind. Recover your important emails even if your Exchange server is down or the OST is corrupted or orphaned. Fixes MAPI errorsand IMAP/Exchange synchronizationissues when Outlook won’t open the file. Unlike Scanpst.exe,this works on disconnected or inaccessible OST and exports to PST,MBOX,EML,or Office 365 and Gmail—with no data loss. Trusted in corporate settings.
Common scenarios where conversion becomes essential for data recovery and migration.
Tip:For OST files over 50GB,close Outlook before scanning for best performance.

Recover damaged or inaccessible OST files and convert orphaned OST to PST when the mailbox can’t be opened in Outlook.

When Exchange Server synchronization fails or the server is offline,the utility retrieves emails from the local OST.

Fix "OST file is not an Outlook data file"errorsand open OST without Outlook when the client won’t load the file.

Move your emails to Gmail,Office 365 and other platforms without hassle—no re-typing or manual export.

Tools create a safe backup of contacts,calendars and emails.

Safely transfer Outlook data to a different system or account
This tool is designed for a variety of useful applications:
Manage Exchange recovery and mailbox data from OST files with ease.
Convert emails to Office 365,Gmail or other platforms securely
Easily access orphaned or corrupted OST files without Outlook.
Keep email backup,compliance and archiving on track—without extra tools.
There is no requirement to install MS Outlook to perform the conversion. Users can Open Outlook OST file without having Outlook. The software is independent to work alone and once OST file is scanned,the tool provides an instant preview of Offline OST items. From there,a user can right click on any message and save it in HTML/MHTML format to view any of the web browsers. Similarly,contacts are saved in vCard format and calendars in ICS format
This tool for OST to PST Conversion perfectly migrates all items inside the OST file like email messages,notes,contacts,tasks,etc. to PST format. Apart from this,you can use this app to export OST file to MBOX,MSG,PDF,EMLX,NSF,Office 365,HTML and TGZ. Without any inconvenience,the app exports OST mailbox data to these known formats in just a few clicks.
The OST File Exporter is easy to handle and there is no need of technical expertise to export Offline .ost file into .pst format. Users when load OST file and get preview of OST file. At that time,users are provided with options to export selective items or complete OST file into personal storage table format. Some simplified clicks are needed to perform the migration. Moreover,users will get these options separately to choose complete or desired folders from OST file for migration.
There are no worries if you have a password protected Outlook data file. The OST to PST software works in a simplified manner and export complete mailbox items without any trouble. The users will not face any issues and any data harm while exporting OST file into PST format. 100% accuracy is maintained during the export process. Users can save the conversion results by creating a new PST file on their local system.
The users have full freedom to export any size OST file. Free OST to PST converter supports any large size OST file. Plus,users have the facility to exclude blank folders from the list of conversion. For this,the users need to enable 'ignore empty folders' option and this will not affect the folder hierarchy and you will find results after excluding empty folders. In this manner,extra items can be easily removed from OST file and hence the conversion task be performed without any extra efforts.
Once OST file is being scanned by the application,the users will get complete mailbox preview where all folders inside OST file are shown on the left side of the wizard. A user can tick mark required folders from there. In this way,a user can perform the required items conversion in a safe and quick manner without any hurdles. Plus,a user can save the exported items to their defined location without any disturbance and losses.
Safety of data is one of the essential features during migration of OST files into PST format. The software takes care of it and perform the conversion in a proper way. It keeps all metadata items intact as original. To,cc,subject,bcc,attachments and the formatting applied to the emails are maintained properly. The original language of the data is duly preserved by the utility. Overall,security of data is on the topmost priority.
There will be no changes in the internal hierarchy of emails or folders while users convert .ost file into .pst and other formats provided by the tool. The application makes the conversion by organizing all data in a sequential manner as it was earlier before the conversion. No folder is missed and misplaced during the migration of offline storage table OST into PST format. You can say,the software is a trusted one app on which users can rely to export offline OST to PST format.
The OST File Conversion software can be easily downloaded on all versions of Windows such as Windows XP,Vista,7 and higher versions. There is no effect on the processing by this tool even you are running other tasks in the background on your desktop. The application doesn't disturb other tasks and it will not affect the speed of the conversion.
Softaken OST to PST converter provides complete support to all major versions of MS Outlook. After successful conversion from OST file,a user can import PST file into MS Outlook 2019,2016,2013,2010,2007,2003. Without any trouble,you can read PST file on all editions of MS Outlook. The migration can be easily carried out in the absence of Microsoft Outlook and users can pick any file format to save OST file from the available formats.
Once PST file is loaded and display on the software screen,the users can pick items from OST file for conversion. Apart from that,users can filter the database more deeply with the Advanced filter options. Here,users can filter the database according to date range i.e. by specifying a start date and end date to export OST database to PST &multiple formats. Users can also filter the database according to subject,from,to,etc. and simply apply the filters. By these,the only required database can be exported from OST file.
OST File Exporter is capable to extract only email addresses of multiple OST files at a time. A separate text file will be created to save email addresses of every OST file. The tool itself ignores duplicate email addresses of each file. There is an option 'include sent item folders' by which one can voluntarily include or exclude email addresses of sent folders. There is no damage and misplacement of any email address during the extraction process with this risk-free application.
This offline folder recovery tool lets user to export multiple OST files so with this,users have the options to extract attachments from multiple OST files. All the selected OST files complete database or required database is exported by users as per their requirements. Moreover,the application works completely as per user instructions. The attachments and email formatting are well preserved and exported with OST emails in a risk-free manner. The users don't need to take tension of any loss and file misplacement with OST conversion program.
Batch OST ConverterTool ensures that the conversion is performed under a safe roof. Using the folder mode,it is possible for users to convert multiple OST files in a single attempt. A user can export OST files of every size. Irrespective of file sizes,the utility deals with OST files of various sizes. There is no effect on the tool's performance due to the number of OST files. It's working efficiency remains the same whether you export single OST file or multiple OST files.
The application provides users the option to export calendars of OST files into ICS format. It is a universally accepted format for saving calendar entries. Apart from it,users can save calendars to MSG format to directly import OST calendars in MS Outlook. The MSG file having calendars can be simply imported to all MS Outlook editions. After providing the instructions to the application,it hardly takes few minutes to convert OST File calendars into ICS and MSG formats. In this manner,users can access OST file calendars to Thunderbird,Apple Mail,and other applications.
Softaken OST to PST file converter exports Address Book of OST into CSV and MSG formats. By exporting OST contacts into MSG format,these contacts can be easily imported to Microsoft Outlook application. Moreover,CSV file format is supported by various applications like Lotus Notes,Thunderbird,Apple Mail,Gmail,Yahoo,etc. In this way,OST contacts can be easily accessed on various platforms. Users can export unlimited contacts from OST file and with some clicks,the OST contacts are ready in CSV format whom they can access cloud-based and various desktop applications.
Expert recognition and trust signals for Softaken OST to PST Converter.
How OST to PST conversion works—add file,scan,preview,convert. No Outlook required.
Open the tool and load your OST data using single file,multi-file,or folder mode. This step prepares mailbox data for safe scanning and conversion.

The software scans emails,contacts,calendars,and attachments to build a complete recovery-ready mailbox structure without modifying source data.

Review mailbox folders and message content before export so users can verify exactly what will be converted.

Choose output format such as PST,MBOX,EML,or Office 365 migration,apply filters,and click Convert to save mailbox data in the required format.

For more,email migration and backup are used for migrating OST to PST,MBOX,EML and more.
You can easily convert Outlook OST files into the MBOX file format,which enables access to inaccessible Outlook data in MBOX-supported email clients like Mozilla Thunderbird,Apple Mail,Eudora,and Mutt.
This tool helps you export all Outlook mailbox items from OST into Zimbra TGZ format. Exported data works with all Zimbra versions and ensures seamless,efficient migration from OST to Zimbra.
Extracting all emails from Outlook OST files and saving them in EML format is simple with this advanced tool. It supports creating EML files for clients like Thunderbird,Windows Mail,Apple Mail,eM Client,Outlook Express,and Maildir.
Converting OST files to EMLX is effortless with this conversion tool. It extracts all or selected folders from OST data and creates EMLX files for supported clients like macOS Mail and Apple Mail.
Move Outlook OST emails into MSG format while preserving metadata and message properties. You can use exported files with compatible applications such as Microsoft Outlook,Microsoft Exchange,and Mailbird.
If you want to access emails without an email client,HTML is a practical option. Select specific folders or emails and open exported HTML files in web browsers like Chrome,Firefox,Safari,and Edge.
Quick OST to MHTML conversion helps access Outlook data with MHTML-supported platforms including Microsoft Outlook,Microsoft Exchange,and Mozilla Thunderbird (with add-ons).
This advanced OST conversion option helps create PDF documents from emails and allows separate attachment saving. It simplifies access,sharing,and long-term archiving in a universally readable format.
Convert OST contacts into VCF format for broad compatibility across devices and applications,including iPhone,Android,Outlook,Thunderbird,and contact management systems.
If you need contacts in spreadsheet-friendly format,this option creates CSV files from Outlook OST contacts. It simplifies import into Excel,spreadsheet applications,and other email clients.
Import Outlook emails into online email accounts through IMAP. This option helps transfer offline OST emails to IMAP-supported services such as Gmail,Yahoo,and Office 365.
Lotus Notes is a powerful email platform,and this tool helps move all Outlook data into Lotus Notes NSF files. You can create both mail.nsfand name.nsfwith ease.
A quick performance and feature comparison to help you decide faster.
| Features | Softaken | Other Brands (Generic) |
|---|---|---|
| Conversion Speed | ✅ Fast | ❌ Slow |
| Attachment Handling | ✅ Embedded attachment support | ❌ Partial or inconsistent |
| Large File Support | ✅ 150GB+ tested | ❌ Often unstable on large files |
| Customer Support | ✅ 24/7 | ❌ Email only / delayed |
This comparison focuses on practical migration performance and enterprise readiness.
Below is the full detail for this page only—we don’t repeat it elsewhere. Open Browse and Settings from the tabs. Conversion:that tab lists every export category we support,start to finish.
| Option | Meaning | Why it is useful |
|---|---|---|
| Select Single OST/PST File | Choose a single file utilizing a file selector. | Quickly convert a single mailbox file. |
| Select Multiple files – File Mode | Select multiple OST or PST files simultaneously by opening a dialog box. | The conversion of multiple files in a single operation without the need to access each folder. |
| Select Multiple files – Folder Mode | Select a folder,and the utility will scan it and all subfolders for OST/PST files and add them. | Useful when a large number of PST/OST files are stored in a single directory tree,such as backups. |
| OST / PST radio (when visible) | In the OST and PST product mode,you are able to select whether you are adding OST or PST files. | Guarantees the correct file type filter and identifiers;the toggle also helps IT admins automate batch selection when mixing OST and PST sources. |
| Change language | Dropdown to select the application interface language. Includes Afrikaans,Chinese,Czech,Danish,Dutch,English,French,German,Hungarian,Indonesian,Italian,Japanese,Norwegian,Polish,Portuguese,Russian,Spanish,Swedish,Thai,Turkish and Vietnamese (21 languages). | Use the software in your preferred language;applies to the whole application. |
Same file-access rules for every run—that keeps performance predictable. The Browse → Settings tab is where you tune it. These options change how the tool opens and reads PST/OST files—handy when a file is locked,damaged,or badly corrupted.
| Option | Meaning | Why it is useful |
|---|---|---|
| Use temp copy when file is in use (e.g. Outlook) | Creates a temporary copy of the file and reads from that copy instead of the original. | If Outlook (or another app) has the PST/OST open,you often get "file is in use."This option avoids that:you don't need to close Outlook. The original file is not modified. |
| Try recovery mode (skip corrupted folders/messages) | When the tool hits a corrupted part,it skips that folder or message and continues with the rest. | Partially damaged PST/OST files can still yield most of the data (e.g. 70–80%) instead of failing completely. Original file is not modified. |
| Automatically enable recovery if errors detected | If the tool detects errors while reading,it turns on recovery behaviour automatically. | You don't have to open Settings and enable recovery manually;the tool adapts when it finds corruption. |
| Deep Scan (tolerant parsing for heavily corrupted PST files) | Uses more tolerant parsing and extra strategies to read as much data as possible from bad files. | When normal open and recovery mode are not enough,Deep Scan can still extract a lot of data from severely damaged PST/OST files. |
Tip:Use "Use temp copy"when the file is open in another app. Use "Recovery mode"or "Deep Scan"when the file is damaged or conversion stops with errors.
After loading PST/OST in the main window,choose an export type from the toolbar or Export menu. Each opens an export form with Options (output location,filters). Convert to PST also has a Settings tab.
Windows 11,10,8,7 + Outlook (32/64-bit)
Supports 150GB+ ANSI and Unicode OST/PST files—verified in enterprise migrations
Migrate in 20+ file formats PST,MBOX,EML,MSG,Office 365 and more
From 49 USD
| Specification | Details |
|---|---|
| Version | 16.0 (latest) |
| Installer Size | 18.3 MB |
| License From | 49 USD |
| Size Support | Up to 150GB+ (Tested) |
| Outlook Versions | Office 365,Outlook 2021,2019,2016,2013,2010,2007,2003,2002,2000 |
| OST File Types | ANSI and Unicode (Compressed &Encrypted) |
| Conversion Speed | Approx 1GB per minute (standard speed) |
Our support team recently helped a client recover a 170GB orphaned OST file that other tools couldn’t open. This software handled it in under 3 hours—full folder structure and attachments intact.
Our team tested this with a 150GB corrupted OST file and it completed conversion in approximately 90 minutes with full folder hierarchy and attachments intact. No Outlook or Exchange connection required.
Since 2015,Softaken has been delivering email migration and recovery solutions. Trusted for secure mailbox recovery and compliance backup by IT professionals worldwide.
Most people worry about the original file getting corrupted during recovery or conversion. We remove that worry by opening your OST in read-onlymode. The tool builds what is essentially a mirror of your data in a new PST—without rewriting or modifying the source file on disk. Your original OST stays exactly as it was.
Mailbox data is sensitive—we know that—so our design keeps it local. Privacy isn’t a bolt-on;it’s how the product is built. Unlike browser-based converters,the whole job runs on your PC:nothing is uploaded to our servers,shared,or passed through third-party APIs. Your machine is the only environment that ever handles the file.
When you migrate or archive,the message body alone isn’t enough. We map the details that matter—To,CC,BCC,and precise timestamps—into the new PST. Folder hierarchy is carried over carefully so the export still feels like your original mailbox,not a flattened dump of messages.
Compare feature limits and full access before you choose.
| Features | Free Demo | Full Licensed Version |
|---|---|---|
| Item Export | 25 items/folder | Unlimited |
| Batch Conversion | Limited | Full batch support |
| License Validity | 1-month | Lifetime |
| Updates | No | Free for 1 year |
Organizations and enterprise teams worldwide rely on Softaken solutions.
Three featured customer quotes below (5★ each). Average and total count match the live visitor rating at the top of this page.
"Recovered all emails from a corrupted OST. Very easy to use."
"Batch conversion saved hours when we migrated our department. Handles huge mailboxes without a hitch."
"Recovered mailbox after Exchange crash. Support was very responsive."
Helpful Information (Quick Guide)
Tested and Recommended by IT Administrators for Enterprise-level Mailbox Migration. Quick answers below on safety,data loss and conversion.
Softaken OST to PST Converterruns entirely on the OST file:no Outlook profile,no Exchange session,no MAPI connection. Four stages:load,deep scan,preview,export.
Full cutover,legal-hold subsets,or one-off recovery—all follow that same workflow. For Outlook-native workarounds and admin context,see our how to convert OST guide.
OST to PST conversion is the process of converting Outlook OST files to PST format for convenient backup and access.
It contains emails,contacts,calendars,attachments and other mailbox data.
You require the conversion of OST to PST for the purpose of data recovery,migration,and backup.
You get your mail back after a crash,corruption or a big upgrade—without fighting the server.
Yes—we focus on badly corrupted OST filesand heavy recovery scenarios.
Recovery mode plus deep scan pull out as much as we can from a bad file. For troubleshooting,see fix OST corruption /open OST without Outlook.
No,there is no restriction on the size of the file when converting from OST to PST.
Large OST files may be converted without any limitations.
Yes—folders and subfolders stay in order while you convert.
All emails,folders and subfolders remain unaltered.
Batch conversion is available in the Business and Enterprise modifications.
Simultaneously processing multiple files is feasible.
The software is capable of converting encrypted or password-protected OST files.
This version is for Windows. For Mac,we have a separate version that only converts OST to PST;you can try by clicking here.
You can export to PST,MBOX,EML,MSG,PDF,HTML and more—pick what fits your workflow.
No,you don’t need Outlook installed. We know how frustrating it is when the Exchange server is down and you can’t access Outlook—that’s why our tool works completely standalone.
OST files are used to store offline Exchange data,whereas PST files are portable Outlook data files.
PST files are simpler to backup and transmit. For further information,consult our guide on the differences between OST and PST.
Yes. The software is completely secure and data-safe;it operates on a copy of your file and does not alter the original OST.
Our featured customer quotes on this page are all 5★;money-back guarantee;used by IT professionals and enterprises worldwide.
Emails,attachments,contacts and calendars are exported without loss of data integrity during the conversion process.
Even from corrupted or deserted OST files,the advanced recovery mode extracts the maximum amount of data.
Yes. IT teams stick with us for a 99.9% recovery success rate when migrations go sideways—plus day-to-day recovery,backup and archival.
Backed by 24/7 support and a money-back guarantee.
Still have questions? Contact our 24/7 support or try the free trial today!