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4n6 Software

Free OST File Viewer

Easily view and analyze all contents of healthy or corrupted OST files offline, with no dependency on Outlook or Exchange.

Software Rating (Average Rating 4.9 Based on 1470 Reviews)

  • Instantly open and view offline OST files without Outlook installation
  • Preview all mailbox items including emails, contacts, calendars, tasks and more
  • Hassle-free read corrupted or orphaned OST files safely with advanced technology
  • Supports to convert OST content to multiple formats for easy backup and sharing
  • Easily search and filter emails within OST files instantly using smart search options
  • OST file viewer maintains 100% data integrity while viewing Outlook OST files
  • Offers user-friendly interface designed for both beginners and IT professionals
  • Supports all versions of Outlook OST files for maximum compatibility
  • No technical expertise required – open and read OST files in a few clicks
  • Efficiently handle large OST files without performance issues
  • Secure and offline solution to access sensitive OST data without privacy risks

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advanced ost viewer software

Best OST Viewer Software

Advanced OST File Scanning and Preview

Our OST viewer is built to help you open all types of OST files safely even if they are corrupted or won't open in Outlook. It uses advanced scanning technology so you can see your emails and attachments along with your contacts and tasks from damaged files. It’s a smart solution to access critical Outlook data offline without losing anything in the process.

  • Open and preview orphaned or damaged files without needing Outlook installed
  • Manage large OST files easily without your computer slowing down
  • Keep every bit of your data exactly as it was with total accuracy
  • Supports all versions of Microsoft Outlook OST files.
multiple ost preview modes

Multiple Advanced Preview Modes to Explore OST Files

We designed this OST preview tool to give you full access to your OST data through several advanced modes. It is perfect for both regular users and forensic experts who need to examine every part of a mailbox. You can use it on healthy or corrupted files from any version of Outlook without any compatibility headaches. Since it is a standalone tool, you can get started right away without requiring Office 365 or Exchange Server environments.

  • Content View: Displays emails, contacts, calendars, and tasks in a clean format.
  • Properties View: This preview mode shows detailed properties of emails including sender, recipients, timestamps, and attachments.
  • Headers View: Analyze email headers to detect issues or trace message origins.
  • Hex View: Examine the OST file at a binary level for forensic or technical analysis.
  • Raw Message View: Access the complete raw content of each email for in-depth investigation.

Main Features

Free OST File Viewer - Main Features

Open Offline Outlook Data Files

Open Offline Outlook Data Files

Using OST Data 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, 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.

Intelligent OST File Management and Analysis

Intelligent OST File Management and Analysis

We created this viewer to give you more control over how you navigate and search through your OST files. You can easily filter your messages by subject or sender and check headers for more technical insights. It is the perfect fit for OST forensic work or simple record keeping because it makes even the most complex mailbox data clear and accessible.

  • You can find any email in seconds by searching for a sender or a date
  • Get deeper insights by analyzing the technical headers and metadata
  • Preview every part of your mailbox including tasks and calendar items
  • The design is very easy to use regardless of your technical skills
  • Your data stays secure and private because the tool works completely offline
2 Editions of 4n6 OST Viewer Tool

2 Editions of 4n6 OST Viewer Software

This Free Forensics OST content viewer is available in 2 different versions for the ease of evidence 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]: OST File Reader installs the application files onto the system along with shortcut and uninstaller.
Read OST file with or without Outlook

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 OST email 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 of OST Reader Tool, one can browse Outlook data files (OST, NST, BAK, ZDB) from any location.
Quick & Advance Search Facilities

Quick & Advance Search Filters

Search facility can be a crucial feature for investigators while examining an OST files 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

Advanced Compact View

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 viewer 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 reader by which one can easily view unlimited OST files in some easy steps. So, free download this OST file opener tool.

Maintain Accuracy of OST Files

Maintain Accuracy of OST Files

4n6 Free OST File Viewer Software is the perfect solution for all your needs. The software always maintains the folder hierarchy and data integrity of the OST file while opening it. There is no harm to the OST file contents. We guarantee that this proven software will provide you with the accurate and exact previews. So, free download OST Viewer on your Windows computer and read OST files without Outlook application.

No Limitations on OST File Size

No Limitations on OST File Size

We are happy to inform you that free OST content viewer has no file size limit. This advanced software allows you to easily open and view Outlook PST files of any size without any problem. You can easily preview large OST files within moments. Additionally, the OST Evidences Viewer has a very basic graphical user interface for the ease. No technical support is required to read OST file without Outlook using 4n6 software.

Open and Read OST Files in Batch

Open and Read OST Files in Batch

4n6 OST reader tool has many advanced features and unique features that make it better than other tools. One such feature is the batch open feature. This advanced feature allows you to easily browse and view multiple Outlook OST files in batch at the same time. Now you don't have to keep running the application and opening OST files one by one. With this application, you can easily save your precious time and open unlimited OST files with just simple clicks.

View and Save OST File Attachments

View and Save OST File Attachments

The 4n6 OST File Reader Software for Windows allows you to easily open and view attachments included in each Outlook OST file. When you right-click on an OST file attachment, the OST Viewer Tool provides three options: Open, Save, and Save All. This amazing feature allows you to easily open and save OST attachments. To save all the attachments of OST email at once, select the Save All option.

Software Screenshots

OST Reader Software - Working Steps

download ost viewer tool
browse ost file
Preview content of ost file
preview header of ost files
preview hex values of ost files

Software Specifications

OST Content Viewer - System Requirement

Software Download

Size : 5.0 MB

Version : 4.2

System Specifications

Hard Disk Space
100 MB of free hard disk space

RAM
Minimum 512 MB RAM

Processor
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

Video

How to View OST Files for Free - Video Tutorial

User Reviews & Industry Recognition

Free OST Viewer Tool - Awards & Reviews

CNET Reviews and Award

According to Cnet, the 4n6 OST Data Viewer is the top choice for safeguarding your files security consistently. This software allows you to access numerous OST files without needing to install Outlook.

Software Informer Reviews and Award

According to Software Informer, the OST Viewer developed by the reputable company 4n6 is considered the top choice for individuals, organizations, and especially forensic investigators. The application has received a perfect 5-star rating from various platforms.

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Comparison Between Free & Pro Version

Benefits

Free Viewer

Viewer Pro

View OST File Content

Auto File Scanning

View OST Attachments

Advance Search Option

Export Unlimited Emails

Cost

Free

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FAQs

4n6 OST File Reader - 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 Data Viewer 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.

Testimonials

Outlook OST Viewer - Client's Review