OST Viewer

A free tool to explore OST files without Outlook

Salient Features of the Software

  • An easy to use tool to View Outlook Offline mailbox data files
  • Preview Option available for both Messages and Attachments
  • Displays all items such as task, journals, calendars etc., perfectly
  • Opens orphan .ost data files of Outlook
  • Reads both ANSI and UNICODE .ost data file format
  • Provides View of all types of OST file - Encrypted, Highly Encrypted, & Compressed

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Learn more about OST Viewer

Free OST Viewer Tool

It is completely freeware, without paying a single buck you can use the tool to view and read Outlook offline mailbox data files. You don't need to waste money on expensive software just simply download for free and access your OST files.

Preview Option - Dual

You can easily get preview of any messages or attachments in the same screen in a proper manner. There are two sections: One displays all items of selected folder the other shows you preview. It contains two tabs one to preview selected message other shows its attachment

Display Proper Information

Advantage of using OST Viewer is it help you to read all important informations related to your files in a proper way. Every minute detail is showed to you without creating any complexity to understand the data. It is a completely full featured program.

Supported by Windows

It is windows based software. You can download it on any version of Windows Operating System. It runs perfectly on Windows 10, Windows 8.1 Windows 7, Windows XP, Windows Vista and all previous version

Easily runs without Outlook

The special feature of this OST Viewer program is that you can get access to your OST file at the situations when you don't have Outlook installed on your system. Also, OST Reader made browsing of Outlook offline data files possible even when exchange server is down.

Simple GUI

Its graphical user interface is created very simple. Any kind of computer user can use the tool comfortably without requiring any assistance to run the free OST viewer. To open OST file without Outlook you just need to click on Add file and browse OST file, software will load all data of selected OST file

Retain Folder structure

You will not face any difficulty using this OST Viewer utility. It will give you view of Outlook offline Mailbox data files as same as in Outlook. You will see same folder and sub folder structure, even the message formatting is not affected. All read and unread message status is maintained.

Opens Orphan OST

It is a special program developed to open and read OST files without Outlook. There are many situations when you can't access OST files such as at down time of Exchange Server, or MS Outlook not installed or when OST becomes orphan. In such cases you can easily open and explore OST files using OST Viewer

How to open OST file without Outlook using OST Reader

Step by Step tutorial to guide how to use Freeware

Frequently Asked Questions about OST Viewer
  • What is the cost of the software?
  • It is absolutely free program. You don't need to make payment to use this software. Just Download software for free
  • Can I send the mail using your software?
  • Sorry, This OST Viewer software is developed only to read Outlook offline mailbox data. You cannot send or receive messages, it just give you the access to OST files
  • I don't have Outlook installed on my system and I want to view OST file. How can I open it without MS Outlook?
  • It is a program which explore your OST file without depending on other software such as MS Office Outlook.
  • Does OST Viewer software perform export process of OST format files to other format?
  • No, it does not change OST to other format. If you want to migrate OST files, we have another specialised tool OST to PST Converter which can perform this task perfectly
  • Can I use this tool on my Mac ?
  • No, you cannot use, if you own Mac machine. OST Reader is compatible to only Windows Operating System and runs perfectly without any error.
  • What are the main specification of the tool?
  • The main specification of this OST Viewer is it opens your OST file at the time when Exchange Server is down or you don't have Outlook installed in your System. Its completely free of cost software which offers you to read corrupt or Orphan OST files without reporting any error. There are a lot more beneficial feature of this tool which is presented in detail in feature tab.
Client Reviews for OST Viewer

Mentioned below are some of the reviews posted by our customers

Its a masterpiece created by the developer team. It helped me a lot. During network issues my important OST files got orphaned, and one day I had an emergency to look over important mails. I was so worried as OST files got corrupted and I needed to open them. Then I Downloaded free OST Viewer software from this website. I thought it will browse only OST file which are in healthy state but it perfectly loaded all mail items from orphaned OST file.
-- Tyler (from Spain)

I don't wanted to invest plenty of amount to buy or purchase any software to view OST data files. This tool is what I was searching for from the last few days. And now I am so happy that I found free OST Reader to open Outlook offline mailbox.
-- Mike (from Austria)

Since, I am not a very tech geek type of person, so I was not sure that whether I could use the program properly or not. But this tool is amazing, it is deigned so well that I didn't faced any issue, its so simple and easy to use software. Everything is properly displayed. I just selected the message and got preview of it in the below panel. It is a precise tool with a efficient performance.
-- Carol (from Germany)

I am a Outlook user, and I regular face errors such as you can't access data files because your OST file has became orphan. I wanted a for ever solution from such situations. I looked for so many OST Reader related products but some were very expensive or some were not that accurate. Then my friend suggested me to use this tool. And seriously I am so thankful to him, I got a one perfect solution for dealing with such errors or downtime of exchange server. I downloaded OST Viewer for free and now I use this application when ever I want to explore OST files.
--Alexandar (from United States )