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OST to PST Converter Tool

Best OST to PST Converter Software, the most suggested program to perform Offline OST file recovery, and conversion. Offers 100% OST to PST conversion quality by its unique OST recovery algorithms that makes it more trustable and reliable software. Software easily extracts OST mailbox emails with attachments, contacts, calendar, and convert OST to PST file in few clicks.

  • Best solution for unlimited OST to PST Conversion, with support of all OST file versions.
  • Execute IMAP OST file recovery and conversion
  • Convert OST to PST, EML, MSG, Office 365, MBOX, Gmail, Yahoo, EMLX, HTML, and vCard file.
  • Has ability to recover OST file as well as Outlook PST and NST file.
* Free download software enables to check the preview of converted OST file and export 25 items per folder.

Product Demo

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Product FAQ

Product Most FAQ

Product Reviews

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Best Key Features of Software

OST Converter Tool




  • Allow users to Convert OST, Outlook PST, and Outlook NST files into multiple formats
  • Recover & Convert OST file obtained from IMAP, Exchange Environment, Office 365, and Outlook.com
  • Instantly perform OST file to PST conversion with Emails, Calendars, Contacts, Tasks, Notes, and other items.
  • Split OST into smaller PST and keep away from large datafile corruption.
  • Recover RTF, TXT, and HTML formats of email messages as well as recover inline images.
  • Email filter by date range to restore OST emails on specific dates.
  • 8-different types of Naming Convention for email messages.
  • Preserve email statuses like Read and Unread status
  • Save OST emails to PST, Office 365, Gmail, Yahoo, MBOX, EML, EMLX, MSG, HTML, and vCard file.
  • Support to recover Outlook OST 2019, 2016, 2013, 2010, 2007, and 2003 files.

Free Live Demo: Download OST to PST software demo and check live preview of OST mailbox and save 20 items from every folder.

MS Outlook installation NOT needed for OST file recovery and conversion.

Award Achievements

cnet award for esofttools ost to pst tool
CNet Editor Choice

Well established company eSoftTools in the field of data recovery & email migration. It develops numerious solutions for administrators, firms and for home users.

Software Suggest Award
Software Suggest Award

eSoftTools OST converter free software is a brilliant & most trusted application to make offline exchange OST file conversion! This tool gives simple steps to fix ost and migrate ost file to pst.

cnet award for esofttools ost to pst tool
PCMag Editor Choice

eSoftTools is most popular in file recovery and conversion field from more than decade. Its continue develop simple and user friendly software solution for everyone.

Rising Star Award
Rising Star Award

FinanceOnline awarded eSoftTools OST File Converter tool for best user experience & performance. FinanceOnline also recommended in featured listing for OST PST conversion in case of Exchange failure.

ost converter software

Special Offer-

Purchase any license of OST Converter Software and avail EML to Office 365 Migration Toolkit free-of-cost.

Download & easily make the conversion of OST File into PST & Multiple Formats

Free Download OST to PST free converter tool, the most trusted and highest-rated tool as the best OST conversion toolkit for an orphan, inaccessible, or corrupted OST. The OST to PST Converter tool will simply solved the queries and gives 100% reliable solutions for-

  • How to export OST to PST Outlook file?
  • How to export OST file to Thunderbird?
  • How to export OST to Office 365?
  • How to import OST to Gmail Account?
  • How to import OST to Yahoo Account?
  • How to Export OST Contacts to Outlook PST?
  • How to Export OST Calendar to Outlook PST or ICS?

Free Download

OST mailbox conversion

Best Cases when eSoftTools OST Mailbox Converter Helps

Are you going to move on a new email client or you need to change your computer and need to open the OST file on a new computer?

It is a very challenging task to move OST file on a different or new computer and access the OST mailbox which is configured with an older computer or email client. OST file always synchronized with the Exchange mail server and store email messages in the OST file and once synchronization stopped then no further any email sync from the mail server and the OST file becomes inaccessible for the user.

eSoftTools OST to PST Converter free tool perfect utility to make this challenging task of OST to PST Conversion and recover OST file and shows all OST File mailbox folders & sub-folders with proper folder hierarchy. This OST to PST mailbox converter application ensures 100% to open offline OST file in few mouse clicks and manage to convert OST to PST file as well as convert OST to Office 365, EML, MBOX, MSG, HTML, EMLX, HTML, ICS, and vCard file. Click to know how to convert OST to PST file?

Exchange Server Unavailability & Needs to Save emails from OST

When Exchange Server goes into maintenance or in up-gradation or dirty shutdown then the email accessibility is not possible through MS Outlook. So there is the only way to get the email data from the OST file by extracting and export OST emails to PST file.

When MS Outlook Thrown Error for offline data file

When Exchange Server unavailability or MS Outlook client disconnects from Exchange Server, then you may see error messages through MS Outlook for Offline Data file accessing.

Outlook Error

Outlook Error

Key Features of OST to PST Converter Software

Easy steps to convert OST to PST file

When the OST file would not be accessible through Outlook and gives errors during opening OST file then the conversion from OST to PST is one of the solutions for accessing OST mailbox data. eSoftTools OST to PST Converter tool works perfectly on the path and create PST from OST file in simple steps-
  • Download eSoftTools OST to PST Converter Software
  • Install the software and open it.
  • Load OST file by clicking on ‘Add OST’ button and open OST file.
  • See the preview of OST mailbox data
  • Click on the ‘Convert’ button to move on the conversion wizard and convert OST to PST or another formats.
convert ost to pst
convert ost to office 365

Import OST Mailbox to Office 365 Cloud

Through OST to PST Export software, users will get an additional benefit for directly import OST to Office 365 account without losing a single bit of important data.

  • All OST mailbox folders including Inbox, Outbox, Sent Items, Contacts, Calendar, Notes, and Tasks easily import to Office 365.
  • Also, preserve folder structure after OST to Office 365 migration.

Note: Unlimited OST to Office 365 migration allowed.

PST Splitting option

PST Split feature is also available in the software which is the most powerful function of this software. The PST Splitting option helps to break the generated Outlook PST file in multiple smaller parts. OST recovery tool offers PST file splitting in 6 different file size range i.e 1GB, 2GB, 3GB, 4GB, 5GB & 10GB.

Make choice of splitting PST by clicking on the Checkbox from the conversion wizard & begin OST file conversion into smaller PST Files.

split pst from ost file
recover corrupted ost files

Recovery of Corrupted OST File

Recover any type of data from corrupt OST file within few minutes through OST to PST converter software. The software offers instant scanning technology to scan corrupt outlook OST File & repairs OST File within couple of moments & finally opens OST file for you to extract OST mailbox for quick conversion of OST Files into PST Files.

export selective ost folders

Recover Selective OST mailbox folders

The tool has an inbuilt feature for users to select only required mailbox folders for conversion. If you want to convert only a few folders from the OST file then choose the checkboxes from the folder list and convert OST to PST file and another format. This process is more beneficial because it saves lots of time.

convert ost to pst file

Complete Conversion of OST to PST File

The OST PST Converter Software scans any sized OST mailbox within a short period of time and displays all the detected items from mailbox folders (Inbox, Drafts, Sent Items, Deleted Items, Contacts, Calendar, Notes, Journals, Tasks &, etc) in an organized way. Users can now avail of the enhanced view of the scanned mailbox item preview by clicking on the folder from lists. The tool permits to save either a selective folder or entire list of OST mailbox folder to PST with a complete arrangement of items. This tool work with all versions of MS Outlook OST Files to recover & convert OST to PST in an easy manner.

preserve ost folder hierarchy

Effectively helpful for preserving folder Hierarchy

Every person wishes to keep maintaining emails in sequence with folder hierarchy to track every record of OST mailbox emails & other items. This free OST to PST Converter tool efficiently works upon exactly & preserves the same folder hierarchy since they are in the original OST File. The software keeps the maintenance of every OST items properties & meta-data

ost email filtering

Advance e-Mail Filter by Date

The software ensures to add on flexibility to the user while making the conversion of OST File through filter emails according to date & filter emails in between the data range & export only the necessarily required emails through OST to PST file.

This functionality works upon the conversion through OST to PST, EML, MSG, MBOX, Office 365, HTML File.

ost database preview

File Naming Convention

The updated tool has more power to provide proper naming of emails while making the OST conversion. Users may self-choose the naming convention over their ease through listed various options & identify the emails clearly.

The naming convention is available in 8-different options over the conversion wizard.

convert ost to mbox

Convert OST to MBOX File

OST to MBOX conversion becomes the best choice if the OST file is inaccessible by MS Outlook because MBOX files are supported by 25+ email-client including- Thunderbird, PocoMail, Entourage, Eudora, Spicebird, etc. eSoftTools OST Converter Software, has an enhanced feature to perfect convert OST to MBOX file. These features are designed for the user to easily convert OST to MBOX file and the output MBOX file can easily import into Thunderbird and other email clients. All the OST mailbox email header and attachments are 100% preserved while getting through the conversion of OST to MBOX file.

convert ost to vcard

Convert OST to vCard (vcf) file

OST file saves various types of data like Email messages, Calendars, Contacts, and other data. Sometimes users wishes to Export Contacts list, Contacts groups into Outlook PST or vCard file. The vCard (*.vcf) files format is supported by most email clients as well as Android mobiles. This eSoftTools OST Converter tool fits 100% guarenteed solution for convert OST to VCF file. The User can export OST Contacts to VCF as well as Outlook PST file in bulk.

ost database preview

Smart Preview of OST items

The software allows checking the preview of any items of OST mailbox within the software because the tool has a separate panel for displaying OST items preview. The user can check the preview of OST Email messages, Contacts, Calendar, Task, Notes, and other information.

support all windows platform

Free OST to PST Converter Tool

The tool supports to make free OST to PST conversion with 25 items from rach & every OST mailbox folders. User can get the facility by downloading free version of OST to PST Converter tool & scan OST mailbox. The OST file scanning process is very faster/simpler and open OST file in simple steps and shows a lists all the folders and subfolders in an well-ordered manner. In final step user just need click on the ‘Convert’ button and software save 25 items per folders from OST file to PST file as well as in other formats.

support all windows platform

Supportable Outlook Version and Windows Versions

All versions of MS Outlook and Windows are supported by the OST to PST Conversion Software.

  • MS Outlook: Outlook 2019, 2016, 2013, 2010, 2007, 2003, 2000
  • Operating System: Windows 10/8/7/Vista/XP

Try OST to PST Free Download

Take a try with eSoftTools OST to PST Converter for free & Convert OST

* The Demo Info: Trail edition of software saves 25 items per folder from OST Mailbox to any format on your desired location.

Software Specification

Trial Limitations

The trail version tool saves 25 items per folder from OST mailbox.

Software Info


Version Support
MS Outlook 2019, 2016, 2013 & lower versions.

Single User, Corporate, Technician, & Enterprise

Language Supported
English, German, Italian, French, Spanish

System Requirements

Intel® Pentium Class

Operating System
Windows 10, 8.1, 8, 7

Hard Disk Space
50 MB of free hard disk space

Minimum 512 MB is required

Software Delivery


Delivery by E-mail

Supported Editions

Win 10 & All Below Windows Versions

How to Convert OST to PST Mailbox items?

This OST converter tool ensures 100% to recover & convert OST file to PST by doing few important steps and entire OST mailbox export into numerous file formats.

Frequently Asked Questions (FAQ)

Follow few simple below steps to export OST to PST file-
  • Get the Software by Download and Install.
  • Run eSoftTools OST to PST Converter Software in your machine and select the OST file from local or network drive.
  • The software begin OST file scanning process and shows a list of OST folders for checking recovery of OST file items by preview.
  • Click on Save OST button and choose "Export to PST" radio button from OST conversion wizard.
  • For splitting PST file from OST, select the checkbox "Split PST" and choose the size from pre-determined 8-distinct alternative sizes.
  • Click on Browse button to select location for saving resulted file.
  • Select Mail filtering option to filter email messages from OST file (by date)
  • Press Convert button and start the OST to PST Conversion process.

Note: User can avail other saving/conversion options such as MBOX, Office 365, EML, MSG, HTML, VCF, ICS and EMLX.

Yes...The OST Converter Software supports converting OST data into multiple formats and one of conversion format is MBOX; These MBOX format is Thunderbird file storage format. Our OST to PST tool gives flexibility to convert OST to MBOX file easily.
Yes, User can recover unlimited/ oversized OST file easily as this software has no any size limit of OST file recovery and conversion.
Yes, the OST to PST Converter software allows convert only essential emails from OST file, make selection of emails with attachments and convert them into new created PST file.
No, You do not requires MS Outlook or MS Exchange Server installation on computer.
Yes, the OST Converter to PST Software is capable to convert all the attachments items from OST file to PST file
The conversion time is fully depends on the size of your original OST file but the software has inbuilt concept to work very faster data processing to reduce the time consuming. Know More - Read More How It Works
This OST 2 PST Export tool is a complete package for OST file recovery and conversion and it supports to export OST to PST, EML, MSG, EMLX, HTML, MBOX, Office 365, ICS and VCF file.

Client Most Valuable Review's

(Rated 5 Star)
This is what I was seeking for!! OST to PST Converter is truthfully marvelous software and has saved my innumerable time in OST to PST Conversion. It was just a magnificent knowledge. Thanks
[ Oscar S ]  [ US ]
(Rated 5 Star)
OST to PST Converter is outstanding, particularly if your OST file is enormous. This OST Converter to PST tool is tranquil to usage and assistances me to recover from corrupt and damaged OST file. This is one of the improved software for converting OST to PST. Overall, the transformation procedure is fairly straightforward, and you get file converted in few minutes.
[ Dean Wells ]  [ Belgium ]
(Rated 5 Star)
Thanks, eSoftTools for reviving me with the problem of Exchange OST files. I get my all inaccessible emails in the healthy format which I easy to read in PST Outlook format and also I convert OST emails to other formats. Thanks again!
[ Roger ]  [ United Kingdom ]
(Rated 5 Star)
At first, I was trying to find a free tool to convert OST file to Outlook. But after wasting my half-day, I got to know there is no such free tool and most of them cost around 40 to 50 USD. After a lot of confusion, I discussed with my cousin and he suggested me to try this tool from eSoftTools. It was the most affordable tool (29USD) among all. With this, I was able to export all mailbox components without a miss. In case if you are reading my feedback then give this tool a try. I am sure that you will definitely like it and will share your review here in a similar manner
[ Barrack Thomas ]  [ United States ]
(Rated 5 Star)
I am looking for best OST converter which helps me to import OST file into Office365 then I got this tool through google and download this software, this Software will assist me in easier steps to move OST file into Office365 without any difficulty. Such a great tool I got through google recommendation. I download it here: http://www.esofttools.com/ost/
[ kevin colin ]  [ Orlando ]