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OST File to PST Converter Software

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SysTools OST to PST Converter
Tool to Backup & Export Offline OST File to PST, Office 365, EML, MSG & HTML

(Average Rating 4.5 Based on 156 Reviews)

OST to PST converter is the best tool to migrate offline Exchange OST File to PST File of Outlook 2016, 2013, 2010, 2007. This OST 2 PST Converter easily extract & backup OST File in PST & also supports to export OST to Office 365, EML, MSG & HTML.

  • Convert Data from OST files: Emails, Calendars, Contacts, Task, Journals etc.
  • Freely preview items before conversion of OST to Office 365, PST, EML, MSG, HTML
  • Batch Convert OST to PST, EML & MSG & Other File Formats new feature
  • Outlook OST Converter allows to Recover, Backup & extract all items of Offline OST file
  • Decrypt & Remove S/MIME & OpenPGP encryption from OST emails
    Users can easily Decrypt & Remove S/MIME (Secured Multi-purposeInternet Mail Extension) & OpenPGP (Pretty Good Privacy) encryption applied on OST File emails. After conversion, users will receive PST File without encryption with help of this tool.
    new feature
  • Auto-Locate & Bulk Export OST to PST with Search All & Selected Drivenew feature
  • Display deleted data restoration from offline OST mailbox in Red Colour
  • Supports Outlook OST file migration from any IMAP, Office 365 & Hotmail OST File
  • Allows to Convert Outlook.bak to PST file of any MS Outlook versions
  • Provides the option to import OST file to Exchange Online (Office 365)
  • Provides Date Filter to Export OST File by Specific Date
  • This OST migration tool is compatible with all versions of Outlook
    OST to PST converter tool is compatible with all the existing versions of Outlook like MS Outlook 2016 / 2013 / 2010 / 2007 and below.

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Free Live Demo - SysTools OST File to PST Converter Fully Secured Download Version

Expert Reviews for OST to PST Converter

The overall OST migration tool is designed nicely that it help its users in all critical scenario. There can be conditions when Offline OST file needs to be transferred without any specific or valid reason. SysTools OST to PST exporter is the simple utility which easily backup offline .ost & convert all the mailbox data from Offline OST file to PST. There is no limit on the size of data to export it using this Outlook OST converter tool.

MVP Logo  MS Exchange Expert

SysTools OST to Outlook PST conversion software is the ultimate solution to export Offline OST mailbox data to Outlook PST file format as well as export .bak file (created using scanpst.exe) to PST file. Its 5.0 version has many update and new features which allow user to convert the data into a healthy state.


SysTools Offline OST file to PST Converter got 5 star rating from BrotherSoft for providing best services with complete support.

soft pedia

SoftPedia give 100% clean award to SysTools OST 2 PST Converter for delivering Spyware & virus freely.


Systools OST Exporter got 4 star rating from CNET for it wonderful performance and simple user interface.


Soft32 rate SysTools Offline OST file to PST converter with 5 star for its effectiveness in converting OST to Office 365, PST, EML & MSG.


Filehippo states SysTools OST Converter software as safe and secure tool to backup OST to PST in the virus scanning technology provided by Avira.


SysTools OST file to PST Converter is the highly suggested OST migration tool among various other tools for its best performance and 5 star rating by its users.

List of Key Features in SysTools OST to PST Converter Software

Tool to Backup & Migrate OST File to PST, Office 365, MSG & EML

export OST files

Batch Convert OST File to PST

This OST migration tool is designed in such a way that it export OST file to Outlook 2016, 2013, 2010, 2007 format in bulk. It converts all data items stored in the multiple OST file such as emails, journals, notes, tasks, contacts, etc. Moreover, using this software to export OST data to PST, one can convert offline Outlook file of any size successfully to PST file format. You can also batch convert OST to PST with our Batch OST Converter Tool.

migrate OST to Office 365

Move OST to Office 365new feature

This OST Exporter tool provides user with facility to upload OST file to Office 365. With this option, the users can easily migrate all items such as Emails along with attachments, Calendars, Contacts etc. from .ost to O365 using Category Filter in Advanced Settings. It also provides facility to export selective mails to Office 365 environment.

scan OST file

Alternative to Save Scanned OST File

As the user add OST file to the OST to MSG converter software, it begins the OST file scanning process. The sacnning is available in 2 Modes: Quick & Advanced depaending on corruption level in OST. After scanning the file, the OST to Outlook PST Converter provides users an option to save the scanned OST file on the local machine. This feature is beneficial when the same OST file needs to be opened in future. A user can directly load the scanned OST file and saves time.

Preview Offline OST Data

Thoroughly Preview OST Data

After successful completion of the scanning process, the OST to PST Converter provides an instant preview Offline OST items with 7+ Preview Modes : Normal Mail View, Hex, Properties, Message Header, MIME, HTML, RTF & Attachments. It includes a preview of all components in OST file like emails, contacts, journals, notes, calendars, etc. Moreover, users can view these data in two different views while moving OST to Office 365 i.e. Horizontal and Vertical view . Also, recovered data is shown in Red Color & folders with data will be visible in bold.

scan OST File

Convert Single & Multiple OST Files

This Tool provide 2 checkbox option to enable users to include and convert single or Multiple OST Files at once :

  • Select File : Convert one OST file at a time to PST
  • Search File : Provides facility to auto search All or Selected Drive from User PC & bulk convert OST Files at once.

restore OST file

Auto-Search within Selected or All Drive

The Search File facility within software console gives two major functions which helps save users effort & time:

  • Search Selected Drive: Locate OST File from Selected Drive (eg- C:, D:, E: etc.)
  • Search All Drive: Locate OST File from All available drive in user PC

Decrypt OST Emails

Remove S/MIME & OpenPGP Encryption

Decrypt Emails option in software console enable Users to easily Decrypt & Remove S/MIME (Secured Multi-purposeInternet Mail Extension) & OpenPGP (Pretty Good Privacy) encryption applied on OST File emails. After conversion, users will be able to receive output PST File without encryption which is accesible without Certificates & Private Keys password.

Date Filter

User-Defined Date Based Filtering

To Transfer Offline OST file to PST format the software provides users an option to convert data from specific dates only. For this, one needs to use the date-based mail filter option and specify the dates in ‘to’ and ‘from’ field. The OST migration software will export OST file that falls under the specified date range to PST format.

Convert OST file to PST

Export OST With or Without Outlook

The Offline OST to Outlook converter software provides users an option to extract data from Offline OST file. The migration can be performed with or without Outlook 2016, 2013, 2010, 2007 installation in the user machine. One can perform complete batch OST conversion process independent of Outlook also with Batch OST to PST Converter Tool.

Date Filter

Exclude Empty Folder during Export

If users do not want to export emty folders within OST file like : Sent Items, Drafts, Spam or user created empty folders, you can make use of option "Don't export Emty Folders". To enable this option you need to uncheck Maintain Folder heirarchy. After which users will recieve PST file without empty folders.

Change OST to PST

Selective Export Options new feature

Sometimes, the users do not want to convert Offline OST file to PST format. Thus, to resolve this option, the OST 2 PST converter provides an option to export files or folders from OST file. To do the same one just need to check the items that you want to export. The OST to EML converter tool will move only files to PST format without any loss of data. This OST to MSG converter also provides Category Option within Advanced Setting that allows you to choose from various Categories : Mails, Calendars, Tasks, Journals & Notes & Export OST File to PST, Office 365, EML, HTML & MSG.

Preserve data

Preserve Meta Data of OST File

With the help of OST to PST Exporter, one can convert all emails along with attachments stored in offline data file to Outlook PST format. In addition, it keeps the metadata of all items intact as the original. For example: To, Cc, Subject, Size, etc. This OST to EML converter preserves the original formatting of OST file items even after conversion.

Export report

Complete Export Report Generation

After a successful completion of the Offline OST data to Outlook PST migration process, the OST migration tool will generate a complete export report. This report contains all details of migration process with exported mailboxes and their destination path. If a user wants then, one can save this report in CSV file format for reference in future.

Maintain Folder Hierarchy

Option to Maintain Hierarchy new feature

This feature within the OST Exporter software allows users to maintain the folder hierarchy of the files in the same way as in the original files after the conversion. You can choose to either maintain folder stucture or not before you start to backup OST to PST.

Outloom 2016 and below versions

Supports Outlook 2016 & Below new feature

This OST Converter Tool provides Support to the latest Outlook Versions. After the successful conversion from .ost file user can import OST to PST in Outlook 2016, 2013, 2010, 2007, 2003.

Steps of Conversion of OST File to PST Format

Following are the detailed steps discussed to convert OST in PST

OST file to PST Converter
Step 1: Launch OST to PST Converter
make OST to PST
Step 2: Preview OST Content on Display Panel
Change OST file to PST
Step 3: Change OST File to PST, Office 365, EML, MSG
Transfer OST File to PST
Step 4: Click on Export Button to Move OST File

Watch Video Explaining How to Batch Convert OST to PST File

SysTools OST To PST Converter Specifications

Offline OST 2 PST Converter box

Size: 26.4 MB Version: 7.0

Secure Outlook OST Exporter

Trial Limitations

Demo version of software will generate Preview & Export only 25 Items per Folder from OST file to Outlook PST, Office 365, EML, MSG & HTML.

Download OST to PST Converter

Installation Uninstallation EULA

System Specifications

  • Support : Windows 10, 8.1, 8, 7 & all below Windows version
  • Processor : Intel® Pentium 1 GHz processor(x86,x64) or equivalent
  • RAM : 2GB of RAM is recommended
  • Hard Disk Space : Minimum 100 MB for installation is required

Supported Editions

  • Microsoft Windows – 2000, 2003, 2008, XP, Vista, or Windows 7/8/8.1/10, 2008/2012 (32-bit & 64-bit)
  • MS Outlook – Outlook 2000, 2003, 2007, 2010(32/64 bit), 2013 (32/64 bit), 2016 (32/64 bit)

Application Pre-Requisites

  • If you are using Windows 10, 8.1, 8, 7 or Vista, then please launch the tool as "Run as Administrator".
  • Admin account of Office 365 must have Office 365 license assigned, you must be able to access OWA for admin.
  • Admin account of Office 365 must be impersonated. How to Apply impersonation, watch video.
  • Check if you have login as administrator on your machine (where tool is running)?
  • To decrypt OST File S/MIME encrypted Emails, Certificates with respective passwords are required
  • To decrypt OST File OPENPGP encrypted Emails, Private Keys with respective passwords are required

Additional Requirements

  • Microsoft .NET framework 4.5

Request For Software Customization

If you need to customize Outlook OST Converter or need additional features then, Request Quote

Frequently Asked Question

Can you list some of the top features of this free demo of Offline OST file to PST Conversion Tool?

What are the possibilities of accessing the contents of an offline mailbox when in orphan state?

How could conversion time be managed and organized according to custom requirements of the user?

What about the mailboxes storing more than 20 GB of data? How much time will they consume during conversion?

Are there any special pre-requisites if I want to migrate OST to Office 365 account?

How can we get multiple mailboxes converted when found in a corrupt state?

How to re-import the OST file stored back to Exchange Server?

How to Open archive.ost file on a new machine?

How to merge multiple OST Files?

How Can I Convert OST to Office 365 account also list some features of this tool?

How do I access OST data of 2 year back?

How to convert OST file to PST in Outlook 2016 ?

How do I backup OST to PST?

How to convert Office 365 or Hotmail OST File?
Can I convert my outlook.bak to .pst file in Outlook?
OST to PST Converter Order Now
Get an Overview of Offline OST File to PST Converter Features - DEMO and Licensed Version

Features DEMO Version FULL Version
Add Single or Batch OST File
Two Scanning Mode (Quick & Advanced)
Preview PST Emails with Attachment
Remove S/MIME & OpenPGP Encryption from OST File
Windows 10 & All Other Previous Windows Version Supported
Split up large PST file by size
Export Outlook BAK to PST File Export 25 Items / Folder All Items
Export OST to Office 365 Export 25 Items / Folder All Items
Save & Export OST 2 PST, EML, MSG, HTML Export 25 Items / Folder All Items
Cost FREE $49
What Clients Say

Top Recommendations of SysTools OST To PST Converter

Transferring all our mailboxes seemed like an impossible task. However, this free demo SysTools OST file to PST converter made it look like everyone's cup of tea. There was not much that we had to do, as the program is quite intelligent and works just on click to go commands. Great job!

Albert Flander, USA

Completely satisfied with the performance of this best Outlook OST converter. We tried this application after trying a number of other tools to export OST to PST. I must say this OST migration tool is better way to move OST file than that of the other vendors offering a tool of the similar specification.

Stephen Simons, Brisbane

Thanks a ton! I have been searching on Google from a long time to convert OST to Office 365. I havent found any data related proper conversion. This tool has helped me move OST file to Office 365.

Jessica Henwick, Toronto

I tried the manual procedure to transfer data from Outlook BAK as well OST file to PST file format but did not get satisfactory results. Either, it export emails only or there is a loss of data. Therefore, I switched to free demo version of OST to PST converter. I must say that what an effort was done by the developer in developing this utility. It exports all data items stored in BAK, OST file without any loss of data. Big thanks to the development team from my side.

Miranda Otto, UK

The date-based filter option to convert data from Offline OST file selectively is the one I was looking for a long time. Thanks to this amazing Offline OST to Outlook PST Conversion Tool for helping me in exporting selective emails that fall under the specific date-range. I also liked Batch OST Converter Tool so much that I am going to suggest this tool to my colleagues also.

Alaric, Brazil
  • Since when I deleted my account & created a new one with OST File. I have been receiving the error " .ost cannot be accessed because it has been configured for use with a different mailbox" How can i access my emails back in Outlook?

    Mars Hobbins

    Engineer, Canada

    Reply for Comments

    • In case of orphaned OST File you can try re-creating OST File. Batch Convert OST to PST software is an effective solution if you encounter problems with OST File.

      Jessica Alba

      Blogger, UK

      • One of the challenges you will find with OST file is, it cannot be accessed in any other profiles apart from the one created. The reason is, it generates an encryption code for every profile.So whenever you access OST file, it searched for the encryption code & matches sever & attempts to open file & user cannot open the file. In such situations you can opt for SysTools Batch OST to PST File conversion.

        Diane Lee (SysTools Developer)

  • My Exchange Server 2007 is crashed & I have many important data in my OST File. Please suggest me any solution to move OST File to PST supported in Outlook 2013

    Mariya Andrew

    Technical Assistant,Russia

    • SysTools OST to PST Converter is the simple utility which easily convert all the mailbox data from Offline OST file to PST which is supported in Outlook 2016, 2013, 2010, 2007 & below versions.

      Nathan Anderson (Author)

  • My client is having some old OST files which I need to convert to PST File such that my client could access those missing emails. Please suggest me any way so that I can access them back in Outlook & backup OST file to PST.

    Barros Paulo

    Tech Enthusiast,Italy

    • SysTools Batch OST 2 PST converter software is an excellent solution to export Offline OST to PST file format as well as export .bak file (created using scanpst.exe) to PST file

      Nathan Anderson (Author)

  • One of my colleagues have stored his entire mailbox data in the Offline Outlook OST file. But, now he is thinking to migrate OST to Office 365 due to some organization requirements. So, can he opt this application to move his OST file?

    Andrew Manson

    Engineer, Phoenix

    • SysTools OST Exporter is the best software for him if he wants to move OST file to Office 365 account. Moreover, he also has the option to change OST to PST, EML, MSG and HTML format.

      Nathan Anderson (Author)

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