OST PST Viewer

Portable viewer for PST and OST files.

  • Recover data from encrypted or corrupted PST files and orphaned OST files
  • Recover deleted emails and folders, and export them to various file formats
  • Analyze email headers and all message properties using HEX analysis

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

OST PST Viewer for Outlook

When to use PST File Viewer

Email Preview

Open, view, and convert PST and OST files without Microsoft Outlook

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
Learn More
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.

Sort and group emails
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.

Examine PST File Without Microsoft Outlook

How it works?

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

OST PST Viewer for Outlook How to use PST Walker


Home License

For Personal Use Only

$4995 $59.95
  • 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 Businesses and Organizations

  • 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: 7.11
License: Named User, Single/Concurrent Use
Interface Languages: English, German, Dutch, Spanish, Portuguese (Brazil)
Release Date: May, 2023
Download: Portable version and Installer
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 4.7.2 or later

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Fixes and Workarounds for Outlook Search Issues

Outlook search issues can be frustrating, but with these tips and tricks, you should be able to troubleshoot and fix the problem quickly. Remember to check the indexing status, profile status, add-ins, configuration settings, and application issues. With a little patience and persistence, you should be able to get Outlook search up and running smoothly again.

Filtering and Exporting Outlook Items by EntryIDs

When managing a large number of Outlook items stored in .pst and .ost files, filtering and exporting based on unique identifiers is crucial. This topic describes using the EntryID (PR_ENTRYID) property of an item to export items to different file formats.