OST File Viewer Tool – FREEVIEWER

Free OST Viewer Designed to Open & Read OST File Without Outlook

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  • View OST File Emails, Contacts, Calendars, Tasks, Notes, & Journals
  • Open OST File with Associated Email Attachments Without Outlook/Exchange Server
  • Pro Version with 7 View Mode (Hex, Mime, Header, Etc) to Analyze an Email in Depth
  • OST Viewer Software is Independent & Standalone to Speeds up Email Management
  • The Software Designed to Read Normal, Corrupt, Password Protected, Encrypted OST File
  • Read OST File of Any Size & Avoid Oversized OST Mailbox Issues
  • Support all Windows OS
    View OST File on Windows 10, 8.1, 8, 7, Vista, XP & other
    & MS Outlook Editions
    Read OST File of Outlook 2016, 2013, 2010, 2007, 2003, 2000

Key Features of FreeViewer™ OST Viewer

Standalone Tool to Read OST File without Outlook

Standalone Application

OST Viewer is a standalone tool to view OST file emails and easily open OST file attachments, contacts, calendar, tasks, notes, journal. The OST file reader is designed to help a user to view normal, corrupt, password protected or encrypted OST file in easy and secure way. This software does not require connectivity with Exchange Server to read OST file. Free download and install the application in any Windows OS including 10, 8.1, 8, etc.

Open OST File without Outlook

View OST File Without Outlook

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 OST file a user need to have supportive application such as Outlook, Exchange Server connectivity. The best OST reader tool allows a user to open OST file without Outlook or Exchange Server connectivity with all important information.

Forensic Analysis: View OST File without Outlook

Forensic Analysis of OST File

Unique OST reader application that lets a user to extracts Outlook OST files without having any password or username details of the mailbox. A perfect OST viewer tool for the forensic email investigator to open OST file with multiple view option like Normal, Properties & Attachments.


Exporting to Adobe PDF

The OST file viewer pro 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

Microsoft OST Viewer Tool 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 OST File 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.
  • Free 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 Reader / 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: OST Reader Tool
Open OST File
Step 2: Provide File Path
Multiple View Mode
Step 3: View OST File Emails
Microsoft OST Viewer Tool
Step 4: View Mode: Horizontal or Vertical
OST Viewer Software Specifications
OST Reader Tool

Size: 6.9 MB Version: 4.2

Secure OST Viewer


Installation Uninstallation

Upgrade to Outlook OST File Viewer Pro for Advance Search Option & Export OST Emails into PDF Format.

System Specifications

  • Hard Disk Space: 24 MB of free hard disk space

Application Pre-Requisites

  • If you are using Windows 10/8.1/8/7 or Vista, then please launch the tool as "Run as Administrator".

Supported Versions

  • Microsoft Windows: 2000, 2003, 2008, XP, Vista, or Windows 7/8/8.1/10, 2008/2012 (32-bit & 64-bit)/10
  • Microsoft Outlook: Outlook 2000, 2003, 2007, 2010(32/64 bit), 2013 (32/64 bit), 2016 (32/64-bit)
Common FAQs
Will the software work without MS Outlook or Exchange Server Environment?

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

Is this OST Viewer software completely free?

Yes, the OST reader tool 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 OST Viewer software is compatible with all the versions of Windows operating system (10, 8.1, 8, XP, Vista, etc) and works great with them.

Can I view password protected files using this freeware?

Yes, the OST file reader 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 OST file given to me by my colleague. Instead of installing the heavy MS Outlook application, I tried this OST viewer 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 FreeViewer team as their OST Viewer software 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 PST File Emails with Attachments
Scan and View Corrupt Outlook OST File
Unlimited OST File Size
Option 1
Option 2
Option 3
Option 4
Multi View Mode
GUI User Interface
Dual File Scanning Option
Supports Outlook 2016/2013/2010/2007/2003/2000
Exchange Server 2016/2013/2010/2007/2003
Cost FREE $69 $49

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