Free OST Viewer Software

Most advanced solution for directly viewing Outlook items from OST files. Access OST file's inner emails, contacts, calendars and other items. Read Outlook items from all types of OST files without need of MS Outlook or MS environment.

  • Open corrupt/ inaccessible/ encrypted /orphaned Outlook OST files.
  • Access OST file's data without MS Outlook & Exchange dependency.
  • View all items from OST files - Emails, Contact, calendars, etc.
  • Support opening OST files of all MS Outlook editions (up 2021).
  • Developed for working on all windows OS editions (including win 11).
Free OST Viewer software

Free OST Viewer Software - Advanced Features

Free ost Viewer Software

Instant Fast Software Delivery via Email

30 days return policy

  • Access Outlook items directly from orphaned/ encrypted/ corrupt Outlook OST files.
  • Open OST file without MS Outlook application or MS Exchange Server environment.
  • Read all Outlook items from OST files like- emails, calendar, contacts, journals, notes, etc.)
  • Get preview of Outlook emails with all their attachments & properties from OST files.
  • Import single as well as multiple OST files at one time for viewing Outlook OST file’s data.
  • Provides a file search option to select/ add OST files by searching them from unknown locations.
  • Also provides the facility for viewing each OST file item on separate window by double clicking.
  • Directly open Outlook OST files in OST viewer tool without facing any file size restrictions problem.
  • Supports OST files of all MS Outlook editions- 2021, 2019, 2016, 2013, 2010, & below editions.
  • Comes with easily operable Graphical Interface for both technical & non-technical user's ease.
  • OST viewer is designed to work on all Windows O/S editions - Win 11, 10, 8.1, 8, 7, Vista, XP, etc.
Free Download  Buy Pro Edition  Software Working

(Note:- Upgrade to Pro/ Pro Plus Edition & convert/ export OST to 15+ conversion & cloud options.)

Free OST Viewer Software - All Features

Directly Open OST file & Read Outlook items

The quickest and most reliable method of directly opening Outlook OST files. Open OST files of various types and sizes using a simple procedure and without an Outlook or Exchange environment. From damaged, encrypted, orphaned, or inaccessible Outlook OST files simple read outlook items.

With OST viewer, now it is simple to load one or more OST files at once and to obtain a preview of all its inner contents. Display all of the emails, contacts, calendar events, and other data from OST file with complete security.

Read More >> How to Open/ View Outlook OST Files?

free ost viewer software
view ost file items

Show all Outlook items from OST files

Users of this Outlook OST file viewer tool may easily open an OST file and obtain a preview of all its inner items without need of MS Outlook application. You may view every content of OST file using the software (including- Outlook emails, contacts, calendar, journals, notes, and other items.)

thunderbird mail folders view

Email preview with complete info

Users may access OST emails with all of their associated metadata and properties using OST file viewer tool. The software provide Email preview from OST files with message content (including photos, hyperlinks, etc.), and header information (like- to, bcc, cc, from, subject, and so on).

supports ost file type

Supports all type of Outlook OST files

The software supports all types of OST files in order to provide previews of Outlook items. Users may easily view all data items from damaged, inaccessible, encrypted, or orphaned OST files and retrieve their data without any difficulty.

add ost files

Adding Single or Multiple OST files

Users of the software have two choices for adding OST files, either individually or in bulk: -

  • Single File Selection: - From the local drive, choose or search for a single OST file and add into the software.
  • Bulk File Selection: - Import many OST files at once to display Outlook items from it.
serach ost file

Search OST from unknown locations

Using the search OST feature of OST reader tool, begin adding OST files from unidentified places. To effortlessly import all Outlook OST files from unidentified location, use this search feature. Choose folders from your local drive, and swiftly scan the directories for adding OST files.

view each item separately

View each OST item individually

Users of the software may rapidly preview every item from OST files on a second preview screen. Additionally, users get the option to view each OST file item in a separate window. By double-clicking on each OST file item users will gets its preview on separate window with complete data.

open ost without size restrictions

Open any sized OST file without restrictions

OST Reader has no size limitations and can work with OST files of all sizes. Users may open Outlook OST files of any size with ease and examine all its inners contents. Additionally, this tool successfully opens several OST files of various sizes at one time.

all outlook edition support

Supports all MS Outlook Editions

Users may access OST files of all MS Outlook Editions using OST File Reader. OST files of all MS Exchange and MS Outlook editions are accessible by this software, including- 2021, 2019, 2016, 2013, 2010, 2007, 2003, and earlier versions.

Graphical user interface

Smart Graphical User Interface

Every kind of user may easily utilise the OST Viewer application because of its simple and smart graphical user interface. The software is secure to use, and both expert to non-technical to quickly read OST files data.

windows compatible

All Windows O/S Edition Support

Users can run this software to read all OST file's data on any version of Windows operating system. On newer to older versions of Windows, such as- Win 11, 10, 8.1, 8, XP, and Vista (both 32bit and 64bit), users may simply access this free OST viewer software.

OST Viewer Free & Pro Editions - Comparison

Software Features Free OST Viewer OST Viewer Pro OST Viewer Pro Plus
Open/ View OST file without Outlook
Add single or multiple OST files
View all Outlook items from OST (email, contact, calendar)
Preview Each OST file item on Seprate Screen
Email Preview with Header detail
View OST Emails with Attachment
Convert OST into Different file format
Upload Outloo OST file's items to Cloud Apps
Download Now BuyNow ($39) BuyNow ($69)

Software Specification

Trial Limitations

Free OST Viewer software to access OST files on windows without MS Outlook & MS Exchange dependency.

Software Info


Supported App

MS Outlook all editions (upto 2021)

Personal, Corporate, Technician

Language Supported
English, German, Italian, French, Spanish

System Requirements

Intel® Pentium Class

Operating System

Hard Disk Space
50 MB of free hard disk space

Minimum 512 MB is required

Software Delivery


Delivery by E-mail

Supported Windows OS

Works with all windows O/S editions 11, 10, 8.1, 8, 7, XP, Vista, & below editions

Frequently Asked Questions (FAQ)

  • On your computer, download and install eSoftTools free OST Viewer software.
  • Open the programme, then select "Select OST" button from the menu bar/li>
  • Choose either "Single File" or "Bulk File" as the file selection mode.
  • Select and add the Orphaned OST files, then click the Start Scanning button.
  • Scan OST file and load all its inner folder and items into the software.
  • In the right side panel, click on each folder or subfolders to extract Outlook items.
  • Now easily, obtain a preview of each OST file item by clicking on it.

Note: (Double click on each Outlook items, & see its preview another screen individually)

Free Thunderbird Viewer

Visit on this link to see the entire process: - How to Open/ View OST Files?.

Yes, OST viewing tool is specially made to access data from all type of OST files. Easily users can open corrupt/ encrypted/ orphaned OST files.
The software was created specifically to open OST files outside of Microsoft Outlook. Additionally, users may use this program to access OST files without the need of MS Outlook or Exchange environment.
Yes, users may get a clear preview of every OST file's contents inside this software (including- Outlook emails, contacts, calendar, journals, notes, and other mailbox items.)
Yes, this tool displays emails with all relevant details, including header information (like- to, bcc, cc, from, subject, etc.) and attachments.
Add one or more OST files in a single process using the software, with two choices for file selection and addition of OST files: -
  • Select Single OST: - Add a single OST file to the software by selecting and searching an OST file manually.
  • Select OST in Bulk: - Choose a folder containing several OST files and import them all at once.
Users can utilise the OST file search option if they are unsure of where their OST files are located. This feature helps users search their local drives for OST files to import them into the software.
Yes, each Outlook item from OST file users may in a separate window. Users only need to double click on each OST file item to see it on separate screen.
Yes, users are free to open OST files of any size (from lower to larger). Additionally, software is tested to ensure error-free opening of OST files of all sizes.
Through this OST reader tool, users may open OST files efficiently of all MS Outlook Editions. Opens OST files (produced by Outlook 2021, 2019, 2016, 2013, and previous versions) without any problem.

Yes, users don't need any form of technical knowledge to use this software to read OST files. Anyone may use the software to quickly inspect entries in an OST file because of its user-friendly graphical interface.

Yes, users of Free OST Viewer may run it on every version of Windows, including older ones. All Windows versions, including Windows 11, 10, 8.1, 8, XP, Vista, and lower all are supported for executing this software.

Users of the OST Viewer pro and pro plus editions may convert and migrate OST files into other alternatives in addition to viewing Outlook items.

Users of the OST Viewer pro and pro plus editions may convert and migrate OST files into other alternatives in addition to viewing Outlook items.

Client Most Valuable Review's

(Rated 5 Star)
Recently, I have used this OST file viewing software to read data from some orphaned OST files. With no disturbance or data loss issues, it has provided me with a clear preview of all Outlook items from OST files.
[ Victoria Chapman ]  [ United Kingdom ]
(Rated 5 Star)
Last year, with this orphaned OST file opener I accessed Outlook items from 100 Gb sized OST files. Also, I have opened several OST files of this size at one time. In my case, it has worked perfectly without generating data loss issues.
[ Anna marie ]  [ Canada ]
(Rated 5 Star)
I have purchased and used the pro plus edition of the OST viewer. After using it I got amazing results for viewing data from all types of OST files and migrating them to cloud apps. From OST files, I have exported Outlook items to 25+ web mail accounts and got no errors.
[ Bertha Green ]  [ United States ]
(Rated 5 Star)
3 mother ago, I tried this free OST viewer software top read data from some corrupt OST files. I have tested this software with multiple OST files and it has provided a clear preview of each OST file item. After getting the expected results, now I have upgraded to its pro edition. Also, this pro edition is working great for performing OST file conversion into different formats. Thanks
[ Connor Hanger ]  [ Belgium ]
(Rated 5 Star)
I was searching for a reliable technique to Open OST files without Outlook, and the solution I have got by using this OST viewer tool. I want to say thanks to the developers who have created this smart problem. I definitely recommend this smart tool to every who thinking to use this software.
[ John Cannabis ]  [ France ]