OST PST Viewer for Outlook

PST Walker

Open, view, and convert PST and OST files without Microsoft Outlook. Easily recover deleted items, search content and attachments, and export to various file formats.

  • Recover encrypted, password protected, large-sized files, and deleted emails and folders
  • Open corrupted PST and OST connected or orphaned Outlook data files
  • Analyze email headers and all message properties using HEX analysis
  • Boolean search, Outlook-style filtering, Built-in search filters
  • Reply to and Forward emails using your default email client

PST Walker Portable Version (.zip) - No installation required

OST PST Viewer for Outlook

When to use PST File Viewer

Email Preview

Portable viewer for .pst and .ost files

PST Walker offers more than just a viewer for .pst and .ost files. With this software, you can extract emails and attachments in bulk and convert your email, calendar, contacts, and tasks to various file formats, including .pst, .mbox (Thunderbird), .msg, and .eml.

Search PST and OST Files

Search multiple PST and OST files

PST Walker offers advanced search functionality that enables you to create highly specific search queries. Whether you're searching for a single email or trying to identify patterns in your email data, PST Walker gives you the tools you need to quickly and accurately analyze your Outlook Data Files.

  • Use various boolean operators and keywords to narrow your search results
  • Scans both email messages and attached emails
  • Supports Active Directory/Exchange x.500 email addresses
  • Highly efficient search algorithms, you spend less time waiting for results
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Filtering PST Files

Built-in search filters

The built-in search filters in PST Walker are designed to be intuitive and user-friendly, so you don't need to be an expert in email search to use them effectively. You can easily access the filtering options by right-clicking on the column header and selecting "Filtering". This brings up a menu of filter options that allow you to quickly refine your search results based on criteria such as sender, subject, date range, and more. Based on your preference, you can use Advanced Search and built-in search filters at the same time.

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HEX Analysis of MSG File

HEX Analysis of PST Files

Outlook data files (.pst and .ost) contain numerous metadata fields (MAPI properties) that can be useful for digital forensic analysis of emails.

PST file specifies five storage elements, each representing one major component of the Message object and a number of streams are contained within those storages, each stream representing a property (or a set of properties) of that component.

The storages are: Recipient object storage, Attachment object storage, Embedded Message object storage, Custom attachment storage, Named property mapping storage.

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How it works?

Step 1: Launch PST Walker and select the folder in the All Folders pane.

OST PST Viewer for Outlook See All Screenshots


Home License

Personal Use Only

  • Open PST file without Outlook
  • Open OST file without Exchange
  • View Emails and Attachments
  • Filter and Sort Emails
  • Multiple Preview Modes
  • Support Outlook 2021, 2019, 2016, 2013, 2010, etc.

Business License

For Organizations and Business Entities

  • Includes all features of Home
  • Advanced Search Options
  • Command Line Options
  • Recover permanently deleted emails
  • Convert and extract emails in bulk
  • Forensic Analysis of PST and OST files

Citrix/TS License

Concurrent Users (CCU)

  • Includes all features of Business
  • Improved scanning and saving speed
  • Concurrent-user simultaneously accessing the Software on Citrix/TS computer

Technical Specifications

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About Product

OST PST Viewer
Version: 7.06
License: Named User, Single/Concurrent Use
Interface Languages: English, German, Dutch, Spanish, Portuguese (Brazil)
Release Date: March, 2023
Download: Portable and Installer versions.
System Requirements

System Requirements

Processor: Intel-compatible (x86, x64)
Memory: 1 GB minimum (4 GB recommended)
Hard Disk: 50 MB for installation files
Operating System: Microsoft® Windows 11 / 10 / 8.1 / 8 / 7
Prerequisites: Microsoft .NET Framework 4.6.2 or later

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How to use PST Walker

This guide explains how to open, find and extract emails from .pst files and .ost files with portable PST Viewer.

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The normal Thunderbird import process requires that you have a compatible version of Outlook installed on your computer. If you do not have Outlook installed, there are alternatives as noted below.

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Email messages contain numerous MAPI properties that can be useful for digital forensic analysis of emails. This article explore how to gather and analyze data related to email investigation and forensic analysis.

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Sort and group email files and messages

Sort, arrange and group your email files and messages in a way that's helpful to you. For example, group by the name of the sender or the recipient and sort by the date of the email message, its size, and other options.