4n6 ost viewer tool




4n6 Software

Forensic OST File Viewer Wizard

Software Rating (Average Rating 4.6 Based on 683 Reviews)

4n6 OST File Viewer Tool is a portable Forensic Tool to open & view OST File for analysis of Outlook Email, Contacts, Calendars, Tasks and Journals with / without Outlook. Downloading this Free OST Reader software will help investigators to search messages / potential evidences from MS Outlook, Office 365 / MS Exchange OST (consisting replica of data in Exchange Mailbox / Office 365) or any IMAP configured OST files.

  • Read multiple OST files of MS Outlook, Exchange / IMAP configured Account
  • Supports to View & Examine Outlook data files: PST , BAK, NST, & ZDB File
  • Analyze data in 5 Views: Content, Properties, Header, Raw Message, Hex View
  • View OST file & Save Attached Data: spreadsheets, documents,etc.
  • Automatically detects the Default OST Location of Configured Outlook Profile
  • Browse suspected OST file from any location & perform deep analysis
  • Forensic OST Viewer provides Compact View to find evidences in folders / sub folders
  • Search suspected evidences / messages by keyword with inbuilt Search
  • OST Forensics Viewer Examine & analyze OST files with / without Outlook installation

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professional ost viewer

Best OST Viewer Tool

A Professional OST File Viewer

The 4n6 OST Viewer Software is a highly professional application developed for quick evaluation of OST files. The tool is simple to use, user-friendly, secure, and totally self-contained. It provides two ways for browsing and selecting OST files. To simply pick and browse OST files, you may either choose from a folder or open a specified Outlook data file.

multi-functional ost file viewer

A Multi-Functional OST Viewer

The OST File Viewer, in addition to being a simple OST reader, also functions as an email forensics tool. It allows you to study OST files in a variety of settings for in-depth analysis of the OST files. In addition to the standard content mode, you may read OST files in headers, raw, and hex modes. As an added feature, it allows you to quickly search for a certain item in your OST file.

Main Features

Features of OST File Viewer for Analysis of Digital Evidences

Open Offline Outlook Data Files

Using OST Viewer Tool, Investigators can easily open & read evidences from OST File. This OST Reader Utility will help investigators to view Messages from MS Outlook, Office 365 / MS Exchange OST (which holds the replica of data present in Exchange Mailbox / Office 365) or any IMAP configured OST files. Hence, the name Outlook Offline Storage Table.

Apart from OST, it can help to view data of other Outlook Data files, PST, OST, BAK, NST, and ZDB. This OST File Reader supports to gives a preview of all messages along with attachments, contacts, calendars, tasks & journals. Free OST Viewer software not lets you to view emails but also supports to save attachments of respective emails. You just have to right-click on the attachment and choose the option needed. This amazing OST File Opener software comes up with so many features. With this app, one can easily view unlimited OST files in easy steps.

Deep Analysis of OST Files

OST File Viewer Tool provides the preview of OST data file in 5 different Modes:

  • Content: View OST File email with Header & Body Content along with attachments just like you view.
  • Properties: Displays properties like Subject, Date & Time, Sent & Received Name & Address, Address Type, Transport Message Headers, Internet Headers, etc
  • Header: Displays Key element properties like From, To, Subject, Date, MIME-Version, Content-Type, Message-ID etc.
  • Hex: Shows the email information in hexadecimal which can help investigators to analyze bit by bit information for example any hidden information, altered data and more.
  • Raw Message: Displays header information (Received: from, Message-ID:, From, To, Date, Subject, Mime, and Content Type etc).

2 Editions of Forensic OST Viewer Tool

This Free Forensics OST File Viewer software is available in 2 different versions for the ease of evidence analysis for investigations:

  • Portable Version [For Investigators]: It is an executable file i.e (click & Run). There is no need to install OST File Reader on your machine. It can be launched directly via USB / flash drive or any removable file.
  • Installer Version [For Normal Users]: It installs the application files onto the system along with shortcut and uninstaller.

Read OST file with or without Outlook

The OST file opener is provided with two inbuilt option to browse OST Files:

  • Open Configured Outlook Data Files: The forensic OST viewer software is featured with an advanced option to auto- detect the OST file. It automatically detects the Outlook files (OST, PST, NST) associated/ configured with the MS Outlook Profile
  • Choose from a Folder: Using this option, one can browse Outlook data files (OST, PST, NST, BAK, ZDB) from any location.

Quick & Advance Search Facilities

Search facility can be a crucial feature for investigators while examining an OST filea as it holds a large amount of critical data. In most cases, OST is large sized holding thousands of emails, and it can be difficult to manually check every mail. With the search facility you can find evidences by entering keywords like email address, date, or any information that you want to filter out from rest of the messages. This feature can be applied on Emails, Calendars, Contacts, Tasks, Notes, etc.

Compact View of Forensic OST Viewer

During the forensics investigation, finding evidences from multiple email folder is one of the most difficult task faced by the investigators. To solve this issue the OST file examiner software offers an advanced compact view option. Enabling or disabling this feature, permits users to view all the folders & sub-folders within the OST file. Also, it is the best OST file reader by which one can easily view unlimited OST files in some easy steps. So, free download this OST file opener tool on your Windows machine.

Software Specifications

OST Viewer Software Specifications

Software Download

Size : 5.0 MB

Version : 4.2

System Specifications

Hard Disk Space
100 MB of free hard disk space

Minimum 512 MB RAM

Intel® Core™ 2 Duo CPU E4600 @ 2.40GHz 2.39GHz Processor

Supported Editions

  • Microsoft Windows – Windows OS 11 (64 bit), 10, 8, 7 (32 bit or 64 bit) & Windows Server 2019, 2016, 2012 R2, 2008

Software Screenshots

OST File Viewer Screenshots
download ost viewer tool
browse ost file
Preview content of ost file
preview header of ost files
preview hex values of ost files


Video Tutorial to Help View OST Files


Comparision of Free & Pro Version


Free Viewer

Viewer Pro

View OST File Content

Auto File Scanning

View OST Attachments

Advance Search Option

Export Unlimited Emails



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Frequently Asked Questions

Follow these simple steps to open & view OST File email data:

  • Step 1: Download & Run Forensic OST Viewer Tool on Windows Machine
  • Step 2: Click on Open & select auto-locate/ manual option to upload emails.
  • Step 3: Select folder & preview Email messages within the OST file.
  • Step 4: Go to the search option & apply filters to find specific emails

Yes, OST File Viewer Tool provides the complete preview of email headers along with Properties View which provides details of CLIENTSUBMITTIME, MESSAGEDELIVERYTIME & CREATIONTIME.

Yes, it is possible with this portable OST File Viewer software. The Portable version of this software does not require the installation of Outlook to view or open OST files.

The tool provides advance search options. Using the search functionality, you can easily filter OST emails sent by a particular person, email address, date / time or any other known keyword.

No, there are no file size limitation imposed on the tool. You can check an unlimited number of OST files.


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