PST Viewer

Portable pst file viewer and explorer for PST and OST files

  • Instant access to email headers and all message properties
  • Easy to open or extract attachments and embedded messages
  • Opens corrupted, encrypted, password protected PST files and orphaned OST files
  • OST PST Reader is available in both installable and portable versions
  • Export to .msg, .eml, .pst, .mbox file formats
Download Free Version Get PST Walker

To download PST Walker portable, use the direct link.

PST Viewer

View, search, and export email messages without Microsoft Outlook

The easiest way to open PST and OST files without Outlook is to use OST PST Viewer. PST Walker Viewer (pstwalker.exe) can be used as a portable application or installed as a Windows application. PST Viewer protects valuable file metadata, you can safely open an Outlook data file without leaving a digital footprint.

Based on your preference, use Instant Search, Advanced Search or number of built-in grid search filters to narrow your search criteria for better searches in multiple Outlook data files. PST Viewer allows you to search email for keywords, and export search results to numerous formats: .pst, .mbox, .msg, .eml.

There are two options for opening a file: Like Microsoft Outlook and Extensive Scan. The Extensive Scan option allows you to open damaged or corrupted PST and OST files.

OST PST Viewer

Portable viewer for .pst and .ost files

PST Viewer is a good solution, when you need to view your mailbox: emails, contacts, tasks and attachments all together in one place.

  • Show the emails in its original format, whether it's HTML, RTF or plain text. Reply, or Forward items using your default email client
  • Support for various encoding settings to correctly display regional characters (such as ü, ä, ø, etc.) and Asian language characters
  • Open healthy, password-protected, and corrupted PST and OST files
  • Find items that were permanently deleted instead of moving to the Deleted Items folder in Outlook (hard deleted items)
  • Find items that are no longer associated with any folder in Outlook (orphaned items)
  • Command line options to open, recover and export emails from PST and OST files
PST Viewer Email View
MSG EML Viewer: Excel-like filtering, Instant search

Excel-like filtering, Instant search

Need to find an important message in a folder with your email files? Sort and filter your emails using the PST Viewer Excel-like filtering interface. Your settings for sorting and arranging items in a Folder View apply until you change them.

  • Review highlighted keywords so you don't need to look for the search criteria
  • Refine your search using the boolean search operators and functions
  • Highly efficient search algorithms, you spend less time waiting for results

Instant access to email headers and all message properties

Email is the most utilized form of communication for businesses and individuals nowadays, and it is often exposed to illegitimate uses. If you are a forensic investigator, you are probably need to be able to determine if an email has or has not been falsified.

The first steps in any investigation are to identify all the potential sources of information. Outlook data files (.pst and .ost) contain numerous metadata fields (MAPI properties) that can be useful for digital forensic analysis of emails.

MSG EML Viewer: .MSG file MAPI properties

Software Specification

Deploy and manage PST Viewer across your company, no IT expertise required.

System Requirements

Hard Disk Space

100 MB of available disk space


1 GB RAM (32-bit); 2 GB RAM (64-bit)


1 GHz or faster processor

Operating System

Windows 11, 10, 8.1, 8, 7, Vista, XP
Windows Server 2016/2012/2008 R2/2008/2003 R2/2003

Supported Versions

Microsoft Outlook 2021/2019/2016/2013/2010/2007/2003/2002/2000/98 and 97

Software Download

Portable and Installer versions are available. Each of the downloads contains both 32-bit and 64-bit versions of PST Viewer.

Setup Command-Line Options EULA

Software Delivery

All products are delivered electronically through online digital download or automated email.

Upgrade Policy

Free upgrades for one year from date of purchase.

Additional requirements

See Also

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.

Recover Outlook Rules and Alerts

Find hidden Outlook rules and alerts using MAPI properties. Export Outlook rules and alerts to rwz files. Import rules and alerts into Outlook. Supports corrupted, orphan, protected pst and ost files.

Recover deleted folder and emails in Outlook

Accidentally and permanently deleted folder in Outlook? Recover deleted folder (and all its emails, messages, contacts) in Outlook with PST Walker recovery tool. Supports both PST file recovery and OST file recovery.

Search multiple .pst and .ost files without Outlook

Boolean search, Excel-like filtering, instant search. Supports any .pst and .ost files: corrupted, orpah, archive, password protected and encrypted files. Export search results to numerous formats.

Convert Outlook data files to Thunderbird (MBOX)

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.

Email Investigations and Digital Forensics

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.

Boolean Search Syntax

This guide explains boolean search operators, functions and wildcards (AND, OR, NOT, ALL, ATLEASTONE, NEITHER, NOTALL, ?, *)

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.