How to Open Outlook OST files in Regzion OST Viewer Software?

Download, Install and launch Regzion OFT Viewer Software for Windows. Press Select OST button and chose Single OST or Bulk OST file adding method. Add OST files and click on Start Scanning to scan OST file and load Outlook mailbox items. Load mailbox folders, and view each item from them in preview panel. Note : - Double-click on each Outlook Item to open on separate window.

Regzion
Free OST Viewer Software

Name: Regzion OST Viewer Software
Brand: Regzion Software
SKU: RG-OSTViewer-2025
Price: 39.00 USD
Availability: InStock
Rating: 4.9 (625 reviews)

5 Star Rated by 1200+ Costumers

Advanced software solution to open OST files and access Outlook data items without the need for Outlook. Use the software to quickly read data from corrupted, encrypted, orphaned, offline OST files.

Open OST files and read all Outlook mailbox items (emails, contacts, calendars, etc).
Supports OST files generated from any edition of MS Outlook.
Ability to work on computer running on Windows (all editions).
Upgradable to pro and pro+ edition for OST file conversion.

Free Download Purchase Now

Available OST Viewer Pro and Pro⁺ edition to convert/migrate OST files to 15+ export options.

windows 10

"Region OST Viewer tool is an efficient and user-friendly tool for reading data from OST files, even those that are corrupted."

- By TechRadar

"With powerful features to preview and convert OST files this OST viewer software is a must-have utility for Outlook users."

- By CNET

"OST Viewer is excellent at recovering data from inaccessible OST files, providing powerful features and simple interface."

- By PCMag

Free OST File Viewer Software- Smart Features

View Outlook data (emails, contacts, calendars, etc.) from OST files without Outlook need.
3 Preview Modes for reading OST Data: -

Item Preview: View the original content of emails, contacts, and calendar items from OST file.
Attachment Preview: Preview all attachments linked to items within the OST file.
Header Preview: View essential email header details like From, To, Subject, Date, and MIME version.

Double-click individual OST items to open them in separate preview window for smart view.
Facility to add individual OST file or add multiple OST files to view Outlook data quickly.
Maintain the original structure and content of OST files during preview and conversion.
Compatible with OST files of all MS Outlook versions- 2021, 2019, 2016, 2013, 2010, & older.
Simple interface for both beginners & experts to easily open/view OST without technical knowledge.
Designed to run on all Windows O/S versions including - 11, 10, 8.1, 8, 7, Vista, XP and earlier.

Pro Edition Features:

Convert OST to PST, EML, EMLX, HTML, MHTML, MBOX, MSG, PDF, ICS, vCard, Zimbra TGZ, CSV and Thunderbird.
Select specific folders from OST file, allowing only to convert OST with required data efficiently.
Smart filter function to export OST items based on date, from, to, subject and attachments.

Pro⁺ Edition Features:

All the features of the Pro version are also available with the Pro+ version.
Additionally, allows OST migration to Gmail, Yahoo Mail, Office 365 and other IMAP accounts.

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All-in-One OST File Solution: View, Convert, and Migrate

Reading Outlook data via Free OST File Viewer

Completely free OST file reading solution by Regzion Software. It allows to easily open OST and view all Outlook data items without the need of Outlook. Preview Outlook emails, contacts, calendars and other items from OST directly in the software. Provide preview of each item while maintaining the original structure and data integrity.

Pro

Upgrade to Pro (OST File Conversion)

Unlock advanced features in the software by upgrading to the Pro version. Convert OST files to more than 13+ different file formats with this single tool. Export and save items of Outlook OST file to PST, EML, PDF, MBOX, MSG, HTML, MHTML, MBOX, vCard, ICS, Thunderbird, and more.

Pro Plus⁺

Upgrade to Pro+ (OST Migration to Cloud)

The Pro+ version takes your OST file management to the next level, allowing you to migrate your OST data directly to cloud platforms like Gmail, Office365, Yahoo Mail and other IMAP-based web email services. Enjoy smart and error-free migration while maintaining complete data integrity.

Free Download Purchase Now

OST Viewer Software - Provides Great Features

Open/View Outlook OST Data

Easily access and view all data from your Outlook OST files. This tool lets you preview all your Outlook mailbox items, such as emails, contacts, calendar events, and more from your OST files. Get the ability to open all types of OST files without having Outlook installed on your system.

Preview in 3 Modes

View data from OST files in three different modes: -

OST Preview - See Outlook OST items - emails, contacts, and calendar items in their original format.
OST Attachment - Preview attachments linked to the OST file items separately.
Email Header - View headers details- From, To, Subject, Date, MIME version.

Open in Separate Screen

With this feature, you can view each OST item separately in its own separate window. Simply double-click on any item, and it will open in a dedicated window. View a detailed preview of Outlook items from OST, including all relevant information such as email content, attachments, and headers.

Single or Bulk File Adding

Import OST files quickly with two easy options to add files: -

Select OST file : - Add one OST file to view and manage.
Bulk OST File : - Import multiple OST files at once for a more efficient experience.

Detailed Item Preview

OST Viewer gives you complete access to all the data present in your OST files. Be it emails, contact, attachments, notes, tasks, or calendar events, all the details are readily available for preview. Shows each item in their exact format and no data is left behind during the viewing process.

Support for All OST files

The tool is fully compatible with OST files from all versions of Microsoft Outlook, including 2021, 2019, 2016, 2013, 2010, 2007, 2003, 2000, and even older versions. Additionally, it can handle inaccessible OST files, including encrypted, orphaned, corrupted, or offline files.

User-Friendly Interface

The user-friendly graphical interface makes it easy for anyone to navigate and access their OST files and read Outlook data. Whether you are tech-savvy or a beginner, the design ensures a seamless experience for everyone. Also, it doesn't require any tough learning to start using it.

Windows O/S Support

OST Viewer to work on all versions of Windows, including Windows 11, 10, 8.1, 8, 7, Vista, XP, and even older versions. Whether you are using the latest Windows version or an older version, this tool will work on all. It is also optimized to run efficiently on lower-end machines.

Upgrade to Pro & Pro+ Edition

Upgrade to Pro and Pro+ version to activate advanced features in software: -

OST Viewer Pro : - Convert OST to PST, EML, PDF, MBOX, MSG, HTML, MHTML, MBOX, vCard, ICS, Thunderbird, & more.
OST Viewer Pro⁺ : - Not only conversion, plus get feature to migrate OST to Gmail, Yahoo Mail, Office365, & IMAP.

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OST Conversion and Migration (Pro & Pro⁺)

Convert OST Pro
Migrate OST Pro⁺

Convert Outlook OST Files to 12+ Convertible File Types

Convert OST to PST

Outlook PST

Convert OST to eml

EML

Convert OST to emlx

EMLX

Convert OST to html

HTML

Convert OST to mht

MHTML

Convert OST to mhtml

PDF

Convert OST to MSG

Outlook MSG

Convert OST to mbox

MBOX

Convert OST to tgz file of zimbra desktop

Zimbra (TGZ)

Convert OST to lotus notes nsf

NSF

Convert OST to csv

CSV

Convert OST to mozilla thunderbird files

Thunderbird

Migrate OST files to Cloud Mail Programs.

migrate OST to office365

Office365

migrate OST to Gmail/Google Workspace

Gmail

migrate OST to Yahoo Mail

Yahoo Mail

migrate OST to IMAP Server Accounts

IMAP

OST Viewer Software Comparison - Free vs Pro vs Pro⁺ Version

	Trial Version ( Free)	Pro Edition ($59)	Pro Plus Edition ($69)
Open and View OST files	✓	✓	✓
Single or Bulk OST adding	✓	✓	✓
Outlook Item Preview on Separate Screen	✓	✓	✓
Preview Email, contact, calendar	✓	✓	✓
OST File Conversion	×	✓	✓
OST to Cloud Migration	×	×	✓
	Free Download	Purchase Now	Purchase Now

What customers says about
Regzion OST Viewer Software

⭐ 4.9/5 based on 473 reviews

Excellent 96%

Good 3%

Average 1%

Below Average 0%

Poor 0%

"I've been using OST Viewer for the past few weeks, and I'm thoroughly impressed with it! It has made it incredibly easy to recover my old OST files and view data from them. Plus, the user interface is simple and intuitive. I highly recommend it to everyone!"

Alfred Schultz

Norway.

⭐⭐⭐⭐⭐

"OST Viewer saved my important data which was available in an orphaned OST file! I opened that OST file directly in this software without Outlook. The option to open items in separate windows is especially helpful for comparing data. Highly recommended."

Paul Ray

Netherlands

⭐⭐⭐⭐⭐

"I have tried several tools to recover data from corrupted OST files, but OST Viewer was by far the easiest and most effective. It handled all my files, even encrypted ones and allowed me to easily access data."

Tonya Darden

Australia

⭐⭐⭐⭐⭐

Write a review

Open OST files in 3 Easy Steps

Download OST Viewer software, then install and run on your Windows PC.

Select OST Adding option - Single OST File or Bulk OST File and add OST files into the software.

Load OST files into the software and easily view Outlook templates from them.

OST Viewer Software

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Software Specification

Software Info

Regzion OST Viewer Software

Version:	2.5
Available License:	Personal, Corporate, & Technician

Version Support

Email client:	MS Outlook.
Version:	2021, 2019, 2016, 2013, 2010, 2007, 2003, 2000, and older.
File type:	OST (Offline Storage Table)

System Requirements

Processor:	Intel® Pentium Class (x86, x64) or equivalent
Hard Disk Space:	50 MB of free hard disk space
RAM:	Minimum 512 MB is required
Windows O/S:	Win 11/ 10/ 8.1/ 8/ 7/ XP/ Vista and older editions.

Software Delivery
( License Key )

Electronic:	YES
Mode:	Delivery by E-mail
Weekends Delivery:	YES

Frequently Asked Questions

Download, Install and launch Regzion OST Viewer Software for Windows.
Press Select OST button and chose Single OST or Bulk OST file adding method.
Add OST files and click on Start Scanning to scan OST file and load Outlook mailbox items.
Load mailbox folders, and view each item from them in preview panel.

Note: - Double-click on each Outlook Item to open on separate window.

Yes, OST Viewer can open encrypted, corrupted, orphaned and offline OST files. It allows you to view all Outlook items from OST, even if the file is damaged or inaccessible in Outlook.

Yes, this software allows you to add multiple OST files at once with the bulk OST file adding mode. You can easily view and access items from all imported files at once.

Yes, OST Viewer supports all versions of Outlook, including 2021, 2019, 2016, 2013, 2010, 2007, 2003, 2000, and even older versions. This ensures compatibility with all your OST files, no matter which version of Outlook you use.

Yes, Attachment Preview mode is available that allows you to view attachments of Outlook items separately.

Yes, Pro edition of OST Viewer allows you to convert OST files into various formats. You can Convert OST to PST, EML, PDF, MBOX, MSG, HTML, and more formats.

Yes, with the Pro+ version of OST Viewer, you can migrate Outlook data items from OST file to cloud platforms like- Office365, Gmail, Yahoo Mail, and all other IMAP web email services.

OST Viewer is compatible with all versions of Windows, including Windows 11, 10, 8.1, 8, 7, Vista, XP, and older versions.

Yes, you can use OST Viewer without having Microsoft Outlook installed on your system. This software allows you to open and view OST files independently from Outlook.