OST File Viewer 4.2 — FREEVIEWER

OST file viewing designed to meet enterprise level challenges.

  • View Emails, Contacts, Calendars, Tasks, Notes and Journals
  • Associated Email Attachments can be also viewed
  • 7 View mode (Hex, mime, header etc) to Analyze an email in depth
  • OST Viewer software is independent and standalone to speeds up email management
  • The software utility designed to meet issues regarding the .ost files
  • Force multiplier to speed up your email related work
  • Supports all Windows OS upto version 10

Key Features of FreeViewer™ OST Viewer

Standalone Tool

Standalone Application

OST Viewer is a standalone tool to view emails that exists in the OST file. Easily view Attachments of the emails. The software is designed to help you view normal, corrupt, password protected or encrypted OST File in easy and secure way and does not require connectivity with Exchange Server and needs only OST file.

Open OST File

Open Outlook OST Files

The OST file (Offline Storage Table) created by MS Exchange server and contains crucial information such as email details, appointment related data, task, notes among other information. To view the information in correct way you need to have application that support and is compatible to show information in correct order (e.g. Outlook Email Client or OST Viewer software).

OST File Analysis

Forensic Analysis of OST File

Unique application that lets you extract outlook ost files without having any password or username details of the mailbox. A Perfect OST Viewer tool for the email investigator.


Exporting to Adobe PDF

The pro version allows user to easily transfer the .ost data file into pdf file format for easy access and sharing purpose. User can also perform selective email analysis and get the output in pdf format. OST Viewer PRO will enable user to perform .ost to .pdf conversion

OST File Viewer — Overview

OST Viewer Software Characteristics

Multiple tabs provided for easy viewing experience as well as for better navigation. Each tab will help you to view emails with different perspective.

Distinguishing feature that the software exhibits are :

  • View Emails, Contacts Details, Journals, Calendars, Tasks and Notes that you have saved.
  • View emails from different OST files and folders under single navigation panel.
  • In-Depth Email analysis using the 8 different tabs that are designed to serve unique task.
  • OST Viewer software can also be used for forensic analysis purpose.
  • The software is simple to use, free to download and run on minimum hardware resources.
  • Comes with 32 & 64 bit OST file Support.
  • View normal or corrupt OST files.
  • View password protected OST files.
  • View Exchange files without Microsoft Outlook platform.
  • maintains data integrity of the Outlook files.

Some basic information regarding the OST extension.

When emails are configured with the MS Exchange Server then all the information related to your email id gets stored in .ost format. The purpose of this ost file is to create an offline version of the data that exist on the server that is viewable to the user even if there is no connectivity with the exchange server.

Download Microsoft Outlook Free OST Viewer

Download free OST File Viewer software to easily open and read the content of OST files. The application displays the data of OST files without connecting to Microsoft Exchange Server and help you to view Offline OST Files with associated attachments. You can preview the email messages, contacts, calendar items, notes, etc. In addition to this, you can also view information such as the date of the message, who sent it, who received it, etc. Along with normal OST files, the OST file Viewer also displays the contents of corrupted and password protected OST files. The OST Viewer freeware works great on all the versions of Windows operating systems such as 8, 7, XP, Vista and 98. An OST file is an offline folder file in Microsoft Outlook. With the help of these offline folders, users work offline and then synchronize the changes with the exchange server when they connect to the internet. OST mail viewer easily extracts information from the above defined OST files without having Microsoft Outlook installed. Using this software, you can preview all the contents available within your OST file.

A complete .ost file analysis tool

The software will enable user to perform extensive research and analysis on the OST data. Applying the search query parameters will enable to retrieve back only the relevant information from the data and after that the targeted email can be further analyzed using the various tab provided (e.g. Hex Analysis).

OST File Analysis Tool
Hex View

The ost files are just the replicas of all the information that exists on the configured server. The user can make any changes in the content which then gets reflected on the server side as well.

OST Viewer Tool Screenshots
OST File Viewer Tool
Step 1: Launch Software
explore messages
Step 2: Provide File Path
view in vertical mode
Step 3: View Each mails
OST File Viewer Software
Step 4: View Mode
OST Viewer Software Specifications
OST Reader Software

Size: 6.9 MB Version: 4.2


Installation Uninstallation

System Specifications

  • Hard Disk Space: 30 MB of free hard disk space
Common FAQs
Will the software work without MS Outlook or Exchange Server Environment?

Yes, the software is not dependent on the outlook application or the exchange server environment and works great without them.

Is this software completely free?

Yes, the software is free and can be used on unlimited machine as long as the usage falls within our fair usage policy.

Can I use the software on Windows Vista machine?

Yes, the software OST Viewer is compatible with all the versions of Windows operating system and works great with them.

Can I view password protected files using this freeware?

Yes, the software provides you with the preview of normal, corrupted as well as password protected files.

What Clients Say

"MS Outlook was not installed on my computer. I wanted to open the OST file given to me by my colleague. Instead of installing the heavy MS Outlook application, I tried this OST freeware and it worked. This software really works great in any Windows OS including 10. I loved it."

- Mia, Australia

"I would like to thank the FREE VIEWER team as their software OST Viewer helped me to open my OST files when I was on a business tour and the Microsoft Office installed on my laptop got corrupted. I downloaded this free software and my work was done. You guys are really doing a good job."

- Nelson Kallis, Sweden

Benefits OST Viewer OST PRO
View Emails with Attachments
Scan and View Corrupt OST File
Unlimited OST File Size
Multi View Mode
GUI User Interface
Dual File Scanning Option
Supports Outlook 2016/2013/2010/2007/2003/2000
Exchange Server 2013/2010/2007/2003
Cost FREE $69 $49