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Free OST Reader (Install)


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This package was approved by moderator gep13 on 11/14/2016.

Screenshot of Free OST Reader

Salient Features of the Software

  • An easy to use tool to View Outlook Offline mailbox data files*
  • Preview Option available for both Messages and Attachments
  • Displays all items such as task, journals, calendars etc., perfectly
  • Opens orphan .ost data files of Outlook
  • Reads both ANSI and UNICODE .ost data file format
  • Provides View of all types of OST file - Encrypted, Highly Encrypted, and Compressed

Free OST Viewer Tool

It is completely freeware, without paying a single buck you can use the tool to view and read Outlook offline mailbox data files. You don't need to waste money on expensive software just simply download for free and access your OST files.

Display Proper Information

Advantage of using OST Viewer is it help you to read all important informations related to your files in a proper way. Every minute detail is showed to you without creating any complexity to understand the data. It is a completely full featured program.

Easily runs without Outlook

The special feature of this OST Viewer program is that you can get access to your OST file at the situations when you don't have Outlook installed on your system. Also, OST Reader made browsing of Outlook offline data files possible even when exchange server is down.

Retain Folder structure

You will not face any difficulty using this OST Viewer utility. It will give you view of Outlook offline Mailbox data files as same as in Outlook. You will see same folder and sub folder structure, even the message formatting is not affected. All read and unread message status is maintained.

Preview Option - Dual

You can easily get preview of any messages or attachments in the same screen in a proper manner. There are two sections: One displays all items of selected folder the other shows you preview. It contains two tabs one to preview selected message other shows its attachment

Supported by Windows

It is windows based software. You can download it on any version of Windows Operating System. It runs perfectly on Windows 10, Windows 8.1 Windows 7, Windows XP, Windows Vista and all previous version

Simple GUI

Its graphical user interface is created very simple. Any kind of computer user can use the tool comfortably without requiring any assistance to run the free OST viewer. To open OST file without Outlook you just need to click on Add file and browse OST file, software will load all data of selected OST file

Opens Orphan OST

It is a special program developed to open and read OST files without Outlook. There are many situations when you can't access OST files such as at down time of Exchange Server, or MS Outlook not installed or when OST becomes orphan. In such cases you can easily open and explore OST files using OST Viewer

To install Free OST Reader (Install), run the following command from the command line or from PowerShell:

C:\> choco install free-ost-reader

To upgrade Free OST Reader (Install), run the following command from the command line or from PowerShell:

C:\> choco upgrade free-ost-reader


  • tools\chocolateyinstall.ps1 Show
    $ErrorActionPreference = 'Stop'
    $packageName= 'free-ost-reader'
    $softwareName = 'Free OST Reader*'
    $installerType = 'EXE'
    $toolsDir   = "$(Split-Path -parent $MyInvocation.MyCommand.Definition)"
    $url        = '' 
    $checksum   = '02038176EAB1C2B09A9528564489D126C7C7FBF7E15BC1930AF5E2DC083659F5'
    $validExitCodes= @(0, 3010, 1641)
    $packageArgs = @{
      packageName   = $packageName
      fileType      = $installerType
      url           = $url
      validExitCodes= $validExitCodes
      silentArgs    = $silentArgs
      softwareName  = $softwareName
      checksum      = $checksum
      checksumType  = 'sha256' 
    Install-ChocolateyPackage @packageArgs  

Virus Scan Results

In cases where actual malware is found, the packages are subject to removal. Software sometimes has false positives. Moderators do not necessarily validate the safety of the underlying software, only that a package retrieves software from the official distribution point and/or validate embedded software against official distribution point (where distribution rights allow redistribution).

Chocolatey Pro provides runtime protection from possible malware.


This package has no dependencies.

Package Maintainer(s)

Software Author(s)



Copyright (C) 2014 - 2016,


Version History

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