Enables To Overcome Forensic Challenges
OST Viewer

Free OST Reader


The foremost challenge, which a forensic investigator while investigating an open OST file, can come across is viewing and extracting evidence from corrupt or orphaned OST file. By no means, it is possible to access a corrupt or inaccessible OST file without the assistance of third party application.


Free OST Viewer fights this challenge by giving a complete preview of even corrupted and orphaned OST file. Moreover, the software offers additional features with the help of which a user can easily perform investigation of the OST file.

Evidence Analysis of OST File Made Easier

List of Features

View OST File

View Corrupted OST File

Free OST Viewer enables the user to view both corrupted and orphaned OST file. The user can analyze entire data of OST file like emails, contacts, calendars, etc. The software shows a hierarchical view of all folders of OST file, therefore making it easy for users to analyze complete OST file data.

View OST File in Dual Mode

Scan Mode

In order to give a preview and enable the users to view corrupted OST files, Free OST Reader scans the OST file. The dual scanning mode consists of Quick and Advance scan for effective scanning of OST files. Quick view scans for minimal corruption and Advance scan for high-level corruption.

Analyze OST File

Multiple Previews For Analysis

To view and analyze every mail in OST file, OST File Opener offers more than 7 previews. The different views offered by the software ae Normal view, Attachments view, Property View, Hex view, RTF view, etc. All the previews enable the users to analyze each email in a detailed manner.

Search Options

Search within OST File Emails

The advance search feature in OST file explorer allows the users to perform search within the OST file emails. The search can be carried out by applying inbuilt logic operators of the software. This enables the users to view only the required emails and to streamline the whole investigation process.

View Attachments

Analyze Email with Attachments

Along with the emails of Microsoft OST file, Free OST Viewer enables the users to open, view and analyze all the attachments as well. The attachments of the email message can be viewed and analyzed separately in the Attachments view tab provided in the software.

OST File Opener

Export OST to PDF File

The user can export OST file in PDF Format to view in other different File reader Software provides an option to export many OST Emails in bulk to PDF Format along with attachments. Just Check box related to mail to export in PDF Format.

OST Viewer
Added Advantages

  • Outlook in synchronization with Exchange server saves data in OST file. The file if corrupted or orphaned can be viewed and can be deeply examined with free OST file browser.
  • The OST file viewer enables the user to perform a dedicated search for the desired emails with the help of its advance searching features.
  • Browse all OST file in proper folder such as: mail, contacts, calender, task, notes journal etc.
  • Free OST file reader help to create a PDF file for every OST file email and it along with attachments. You can check or uncheck the files or folder that you wish to export from OST to PDF.
  • OST file explorer is a dedicated forensic utility that enables to perform examination on OST files in order to carve out the required evidence.
  • Being a Windows based utility, it is compatible with Windows 8.1 and all the below versions.

System Specifications
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System Specifications

  • Windows OS : Windows 10 & All below windows-versions
  • Processor : 1 GHz Processor (2.4 GHz is recommended)
  • RAM : 512 MB of RAM (1 GB is recommended)
  • Disk Space : Around 50 MB free space for installation
  • Microsoft Windows : 2000, 2003, 2008, XP, Vista, or Windows 7/8/8.1,10 (32-bit & 64-bit)
  • MS Outlook : Outlook 2000/2003/2008 , 2010(32-bit & 64-bit) & 2016(32-bit)


Demo Edition of the OST Viewer Tool - Previews different file such as EML, EMLX, MBOX, HTML & TXT. But to Save in Format file format, you need to Purchase full edition of the DMG File Viewer.

Product Details
  • Version: 4.2
  • File Size: 14.1 MB


OST File Opener
Assured Detailed OST Examining

Independant Utility

Standalone Application

Free OST Viewer is a standalone utility that does not require installation of any client for its functioning. The software gives a complete preview of the OST file without installation of MS Outlook.

Recover File
Recover Corrupt OST Data

Free OST file viewer allows the users to view even the corrupted data of OST file. It recovers the complete OST file data with the help of Quick and Advance scan and gives a preview of the recovered data.

Examine OST Data
Analyze OST File

OST File Opener does not pose the viewing limitations on Password protected OST files. In case the user's OST file is password protected, it can still be viewed in the software without supplying the passwords.

What Our Customers Says...
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As my Outlook was not installed on my computer so I was unable to open my OST file given by my colleague. I wanted not to install MS Outlook application, I tried OST Viewer and it worked. This software really works thanks to all!.

Paul Jew, Greece

This OST Viewer software has helped me alot to open my OST files which were on the urge of corruption. One of my friends has recommended me this software and I am very happy to see the results. All thanks to the development team!

Williams Blanc, Canada

Frequently Asked Questions

No, OST File Opener will not export the Odt file data that is being viewed.

Yes, OST reader freeware will give a preview of both ANSI and UNICODE type OST files.

No, there is no size limitation on the OST file that has to be viewed by Free OST Reader.