OST PST Viewer

View all items in OST or PST file, whether they're emails, tasks, contacts, notes, calendar events, or attachments, you can easily open them all.

  • Open healthy, corrupted, and orphaned PST and OST files
  • Recover deleted emails and folders, and export them to various file formats
  • Analyze email headers and all message properties using HEX analysis
OST PST Viewer for Outlook
Portable and Installer versions
Email Preview

Open all your Outlook Data Files

Whether it's an archived, corrupted, or orphaned Outlook file, OST PST Viewer opens all types of Outlook data files – .pst, .ost, and .msg – without accessing Outlook.

  • Open Corrupt PST Files: No need to worry about repairing corrupt Outlook data files to view their content. The tool scans and repairs every PST file, ensuring you can access your content.
  • Open Password Protected Files: Access PST files without requiring a password, and in cases where the password is forgotten, you can still get access to the file.
  • Protect the privacy of an email message: Support for digitally signed and encrypted secure messages, as well as Active Directory/Exchange x.500 email addresses.
  • PST File Locations: You have the flexibility to open any .pst or .ost file, or select a data file from the list of the recently opened files in Outlook.
  • Single or Multiple File(s) Selection: You have the flexibility to open Single File or Open Multiple File(s) options. This will save you from repeating the process when you need to access a different PST file.
  • Support for Various Encoding Settings: Ensures accurate display of regional characters (such as ü, ä, ø, etc.) and Asian language characters in emails.
  • Recover Deleted Emails and Folders: Restore accidentally deleted emails and folders, and items that are no longer associated with any folder in Outlook (orphaned items). Learn more...
  • Recover Rules and Alerts: Recover disappeared Rules and Alerts in Outlook and export the rules to .rwz file. Learn more...
Filtering PST Files

Search and Filter All Outlook Items

Whether you're in search of an individual email or attempting to recognize patterns within your email data, PST Viewer provides the necessary tools for a swift and precise analysis of your Outlook Data Files.

  • Advanced Search: Scans both email messages and attached emails. Use various boolean operators and functions to refine your search results. Learn more...
  • Built-in search filters: Select Filtering to swiftly refine your search results based on criteria such as sender, subject, date range, message size, and more. Learn more...
  • Keyword search: Select a category from the Filter drop-down menu to further filter your search results: From, Subject, Unread, Has Attachments, Sent To, Received and more. Learn more...
  • Recent Searches: Rerun recent searches efficiently due to highly optimized search algorithms, which reduce your waiting time for results.
  • Search using PowerShell: Command-line options for searching and exporting results to various file formats. Learn more...
Search multiple PST and OST files
Export options

Export emails from Outlook

Whether you want to export emails and attachments in bulk or convert your emails, calendar, contacts, and tasks to various file formats, PST Walker Viewer offers powerful functionality for exporting and backing up items from .pst and .ost files.

  • Cross-platform File Formats: Convert items to .pst, .mbox (Thunderbird), .msg, and .eml file formats.
  • Customizable File Names: The utility allows you to flexibly configure the names of the resulting files.
  • Export Options: Replicate folder structure from the source, skip empty folders, save Internet transport options, and more.
  • Export using PowerShell: Command-line options for searching and exporting results to various file formats.
Command-line options
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.

Email fraud investigation

How it works?

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

OST PST Viewer for Outlook PST Walker Viewer: Guide

PST Walker Plans and Pricing

Top Features FREE Version FULL Version
Open all Outlook PST files and OST files
Open Outlook MSG files (rich text, text, and html)
Open EML files (RFC-822)
Print selected emails
Reply To and Forward emails using your default email client
Multiple Preview Modes
Search emails
Save emails in various file formats Trial message
Cost Free Prices starting at $29.95
View All Pricing Plans

Technical Specifications

Product Icon

About Product

OST PST Viewer
Version: 7.27
License: Free, Personal, and Commercial use
Interface Languages: English, Dutch, French, German, Italian, Portuguese (Brazil), Spanish
Release Date: Jun, 2024
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

Frequently asked questions

If you have any questions about PST Walker Viewer, feel free to ask! Below, we have answered a few commonly asked questions to get you started. For more information about using PST Walker Viewer, visit our Help center.

PST Viewer and PST Walker are both software applications used to open and access PST (Personal Storage Table) files, which are used by Microsoft Outlook to store email messages, contacts, calendar items, and other data. However, they have different features and capabilities. Here's a brief comparison of the two:

PST Viewer
  1. Outlook is not required: PST Viewer is a free tool for viewing the content of PST files. Read email messages, view attachments, see contact details, and check calendar events within PST files.
  2. Viewing Capabilities: PST Viewer allows you to browse through emails, contacts, and other items within PST files.
  3. Limited Editing: PST Viewer software offer basic editing features, like the ability to reply to or forward emails, but the editing capabilities are limited compared to a full-fledged email client like Microsoft Outlook.
  4. Read-Only: Generally, PST Viewers are designed for read-only access to PST files. You can't perform advanced tasks like sending emails or creating new items.
  5. User-Friendly: PST Viewer tools are user-friendly and are suitable for individuals who just need to access the contents of PST files without advanced email management features.

PST Walker
  1. Advanced Functionality: PST Walker is more feature-rich and offers more advanced capabilities than a basic PST Viewer. With this software, you can access .pst and .ost files, extract emails and attachments in bulk and convert your email, calendar, contacts, and tasks to various file formats.
  2. Forensic Analysis: PST Walker is often used in digital forensics and e-discovery scenarios. It provides advanced search, analysis, and reporting features for investigating and analyzing PST files.
  3. Powerful Searching: PST Walker allows for deep and granular searching within PST files, including searching for specific keywords, dates, attachments, and more.
  4. Export and Conversion: PST Walker offers both UI and command-line options to search and export Outlook Data Files (.pst and .ost) into various formats, such as PST, EML, MSG, and MBOX (Thunderbird).
  5. Metadata Analysis: In addition to the actual email content, PST Walker allow you to analyze and extract metadata from PST files, which can be useful for investigations.

In summary, if you simply need to view the contents of PST files, a PST Viewer should suffice. However, if you're looking for advanced features like forensic analysis, advanced searching, and data extraction, PST Walker would be the better choice.

Microsoft does not offer a standalone PST viewer software. PST files are associated with Microsoft Outlook, and Outlook itself can be used to view the contents of PST files. If you're unable to open the .pst file in Outlook or if you don't have Outlook, you can use OST PST Viewer to open both .pst and .ost files.

Outlook Data Files (.pst and .ost) contains your messages and other Outlook items and is saved on your computer. Certain types of accounts, such as POP accounts, store their information in Outlook Data Files (.pst files). Most other account types, such as IMAP accounts, Microsoft 365 accounts, Exchange accounts, and Outlook.com accounts use an Offline Outlook Data File (.ost) file to store a synchronized copy of your mailbox information on your local computer.

Note: In Outlook 2013 and earlier versions, IMAP accounts also used an Outlook Data File (.pst). In Outlook 2016 and Outlook for Microsoft 365, IMAP accounts use Offline Outlook Data Files (.ost).

You can also use an Outlook Data File (.pst) to backup or export items from any type of email account.

If you have a .pst file that doesn't appear in the All Folders pane, add the .pst file to PST Walker Viewer so that you can work with the items in it.
  1. On the File menu, click Open.
  2. Click the .pst file you want to open, and then click OK.
If you are unaware of the location of a .pst file:
  1. On the File menu, click Outlook Data Files.
  2. Choose the .pst file you want to open from the list, and then click Open.

You can open an .ost file without Outlook using OST PST Viewer or export it to another format using a file conversion tool. Converting .OST files with PST Walker Viewer is a simple process – just select the format you want to convert it into (such as .PST, .MBOX, .MSG, or .EML), and then retrieve the converted email files with a few clicks.