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OST Viewer Tool

Open and view healthy as well as inaccessible OST file data along with complete details.

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OST Viewer tool offers these advantages to its users.

  • Scans OST files and displays content like emails, contacts, etc.
  • Accesses healthy as well as damaged or corrupted OST files
  • Opens OST files without MS Outlook/Exchange account
  • No need to have a connection with Exchange Server for accessing OST files
  • Saves email details in HTML format
  • Compatible with all Windows Operating system including Windows 365 and 11
OST Viewer Tool

Client Testimonials

OST Viewer

Our clients share their experience after working on this viewer tool.

Software Features

With the Free OST Viewer tool, it is possible to view content from highly corrupted OST files. Learn about the advanced features offered by this utility.

No Exchange Server needed No Exchange Server needed

The OST Viewer has been designed with an utmost clear motto of no requirement of Exchange Server to view OST file contents. Once installed, you can carry on the task of easy selection and scanning of respective OST file.

Comprehensive File Analysis ReportsComprehensive File Analysis Reports

The free OST viewer lets you access Outlook OST file and at the same time provides the details like email flow density by various criteria by generating detailed File Analysis Reports.

Find Option for OST File ItemsFind Option for OST File Items

The tool is well integrated with advance searching option that enables its user to perform search operation within the selected OST file. All that you require is check and un-check the folders and define different criteria's like: search by "to" or "from" email ids or “Subject” etc.; to further filter all the items.

Clear OST File PreviewClear OST File Preview

Free OST viewer tool provides Simple View & Advance Properties View options to view the email. While simple view option displays the preview of email along with attachment (if any), another option helps viewing the properties of an email message.

Opens password protected fileOpens password protected file

Free portable OST viewer is very well equipped to open even the password-protected OST files. In fact, it doesn't matter whether the user has the original Exchange profile or not.

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How it works?

View OST files in three simple steps with the tool. Let’s see how:



Know about the software/hardware specifications, which must be met by you to use this viewer tool.

System Requirements
  • Minimum Memory Requirement: 64 MB
  • Disk Space Requirements: 50 MB of Free Space
Supported Versions
  • Windows OS Platforms: Windows 365, 11, 10, 8.1, 8, 7, Vista, XP, 2000, 98, NT & 95
  • MS Outlook: Outlook 2019, 2016, 2013, 2010, 2007, 2003, 2002, 2000, 98 & 97
  • Outlook Express: Outlook Express 6.0, 5.5, 5.0 & 4.0
  • MS Exchange Server: MS Exchange Server 2019, 2016, 2013, 2010, 2007, 2003, 2000, 5.5 & 5.0
Product Guides
& Licensing

Upgrade to

Corporate/Corporate Premium License

Save the OST mailbox data to PST, cloud or other destinations by upgrading the Free OST Viewer tool to Corporate or Corporate Premium License.

Software Features OST Viewer Home License Corporate License
Opens OST files without Exchange
Searches OST files on a specified drive
Detailed preview of OST file items
Displays encrypted / protected OST files
No OST file size limitation
Works with multiple OST files at a time
Saves the list of OST emails in HTML format
Generates OST File Analysis Reports
Converts OST files to PST  
Splits large OST files into many small PST files    
Saves emails in DBX, MSG, EML, TXT/RTF, PDF, & HTML/MHTML    
Saves OST data to MBOX files    
Saves OST data to email servers (GroupWise / Exchange / Domino) & Office 365    
Saves OST data to web-based email clients – Gmail, AOL, Yahoo, etc    
Compatible with all Outlook/Windows versions
Free Technical Support –24x7 (Phone, emails, & Chat)
PST Outlook Repair Tool      
Repairs damaged PST files    
Repairs large & encrypted PST files    
Splits large PST files into small ones    
Saves PST data to Gmail & other web mails    
Saves PST file to email Servers (Exchange) & Office 365    
Cost Download now Download Now Upgrade $69Purchase Now Upgrade $199 Purchase Now

OST Viewer


We have answered a few common queries over this Free OST Viewer tool.

The OST Viewer is a free tool developed by KDR tools, to provide an immediate assistance to the users who need a stable solution to view the content present in OST file. The entire content of corrupt OST file can also be viewed in few clicks.

Being a free tool, OST Viewer does not require any license for activation.

Any change or upgradation in OS depends upon if the OST Viewer supports that version. Before doing any modification, you have to look thoroughly the supported versions by the OST Viewer.

In case of any query, you can immediately contact to our technical support team either through phone or using live-chat software. Your response will be shortly prompted on your system screen once live-chat gets initiated.

User Reviews

and Ratings
OST Viewer
(4.9 / 5) 559 Reviews

Reviews 559

  • Excellent
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  • Bad
First < 1 2 3 4 > Last
22nd December 2020 7:26pmmarry
Excellent Software. I could open my inaccessible OST files without an Exchange account. Thanks a lot.
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24th August 2020 12:00amLuice
Exceptionally lucid software.
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23rd January 2020 4:17pmMichael
Due to frequent business trips, mostly, I am on the move. In some places, it is often difficult to get connectivity. Therefore, it is impossible for me to access my OST files. Luckily, I found Free OST Viewer tool just in time.
Full StarFull StarFull StarFull StarFull Star
9th January 2020 6:30pmBartalotta
Now and then, my OST files get corrupted. My busy schedule doesn’t allow me to try out manual methods or third-party tools- which require paid subscriptions. Free OST Viewer tool is just what I was looking for, and on top of that, it is Free!
Full StarFull StarFull StarFull StarFull Star
First < 1 2 3 4 > Last
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