Free OST Viewer



Free OST Viewer Tool

The free OST File Viewer is a tool to open, view, and read OST file with attachments. This tool allows the user to view all data items like emails, contacts, calendars, tasks, etc., stored in offline OST file without any hassle.

  • Open and View Outlook OST File Along with Attachments
  • Instant Preview of OST File Data Items Emails, Contacts, Tasks, Journal, etc.
  • Provides Advance Scan Mode in Order to Repair Corrupt OST File Items
  • The Application is Capable to Preview Multiple Offline OST Files at Once
  • Option to Save and Reload the Already Scanned File to Save Time in Future
  • Outlook and Exchange Server Environment is Not Necessary to Read OST File
  • Supports to View OST File of Outlook 2019, 2016 and All Its Below Versions
  • Supported Windows 10, 8, 7 and Windows Server 2016, 2012 R2, 2008

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Free OST Viewer – Overview

What is OST File?

Offline Storage Table or OST file is an offline folder, which is created by Microsoft Outlook and Microsoft Exchange Server. It maintains the offline copies of all data exists on the Exchange server. Or it can also be said that OST file is a local replica of the Exchange mailbox. It gets created when emails are delivered to the MS Outlook mailbox and contain all data items like emails, contacts, calendar, etc. OST file let users work in an offline mode or when a user is not connected to Exchange Server. However, all the changes done in offline mode will get updated automatically when the connection will re-established. Moreover, OST file is accessible only in that profile which has created it originally.

When A User is Unable to Open OST File

There are various situations in which it becomes merely impossible for a user to open and view Outlook OST file. Some of them are discussed below:

  • If a user has an orphan OST file, then he or she needs to look for some software to open OST file on the local machine.
  • In some cases, offline OST file become corrupted and in that case also a user is unable to access OST file without any external help.
  • If Microsoft Outlook is not installed on the local machine and a user receives OST file from somewhere else, then also one needs to look for some alternative.

Now, to overcome all above situations, a user is advised to use free OST file Viewer tool. It is an amazing application that is capable to view orphan and corrupt OST file without installing MS Outlook on the local machine.

Key Features of OST Viewer Tool

Some Highlighted Features to View OST File on Windows OS

View OST File

Open & Read Multiple OST Files

With the help of free OST Reader tool, a user can open and view multiple OST files in bulk also without any hassle. It generates an instant preview of all data items stored in OST file like emails tasks, notes, etc. It provides preview of all messages along with associated attributes like from, to, sent, size in bytes, etc.

Open OST with Attachments

Option to View Email Attachments

The Outlook OST Viewer tool is designed in such a manner that it allows users to view all attachments also associate with each email. The application is capable to open and view OST file attachment of all types i.e. documents, photos, files, etc and all other similar files.

Scan Mode

Provide Advanced Scan Mode

In the case of corrupt OST file, a user can choose the Advanced Scan mode offered by the OST File Opener tool. It will scan and remove all type of corruption from OST file and generates an instant preview of the data stored in it. Moreover, the application does not require any extra installation to view OST file.

Read OST Contacts

View Outlook OST Contact

The best part of this OST file Reader software is that its application interface shows the preview of OST Contacts and Distribution list. As a user start the software, all contacts in OST file will be displayed in the software panel as it displayed in Microsoft Outlook. Apart from this, it does not impose any file size limitation.

Open OST Calendars

Read Calendars of OST File

If a user wants to open and read calendars stored in OST file, then a user needs to click on the calendar tab directly from the software interface. However, the OST Viewer by default displays all emails but a user can change it based on its preferences. In addition, the tool offers separate tab for Notes, tasks, and journals also.

Easily View OST File

Optimize View of OST File

Another impressive feature of this OST Viewer tool is that it let users open OST file data in an optimized way as it does not show any crash report. Moreover, it also allows users to change the location of Temp folder from the installation drive i.e. C drive to some other free space drive. It will reduce the overall consumption of main memory.

Free OST Viewer Tool System Requirement

Software Download

Size: 18.1 MB

Version: 5.0

MD5: 7920bd60326278c1bd912f4146f604d7

Trial Limitations

Free Version of OST Viewer only preview all Emails with Attachments.

System Specifications

Hard Disk Space
100 MB of free hard disk space required

2 GB of RAM

Minimum 2.4 GHz Processor

Supported Editions

Windows 10, 8, 7 (32 bit or 64 bit) and Windows Server 2016, 2012 R2, 2008.
Microsoft Outlook 2000, 2003, 2007, 2010(32/64 bit), 2013 (32/64 bit), 2016 (32/64-bit), 2019 (32/64-bit)


  • Microsoft .NET framework 4.5 or above should be installed.
  • If you are using Windows 10, 8, 7 (32 bit or 64 bit) & Windows Server 2016, 2012 R2, 2008, then please launch this tool as "Run as Administrator".


Q. Is your Antivirus blocking the software export process?

A. Please disable Anti-virus temporarily / Allow access (Whitelist) from Antivirus settings for proper working of the software.

Q. Unable to Create Output in destination?

A. Please avoid NAS, SAN, Network or Shared Drive. Source file should be on the migration machine to perform successful conversion.

Electronic Delivery

The delivery of the product is automated, You will receive an email containing both the link to download the product and the activation key within few minutes after payment confirmation.

Features Comparison

Get an Overview of OST Viewer Features – Free and Pro Version

Features FREE Version PRO Version
Open OST File
Preview Data Items of OST File
Preview Emails with Attachments
Windows 10, 8, 7 (32 bit or 64 bit) and Windows Server 2016, 2012 R2, 2008
Advance Search and Naming Options
Print or Save OST Files
Cost FREE $69

Frequently Asked Questions

Listed Commonly Asked Questions and Answers

No, a user is not allowed to save previewed OST file data on the local machine as it is a free application.
Yes, with the help of this OST Reader tool, one can view orphan OST file also without any hassle.
Yes, a user can easily open and view all attachments also associated with each email of OST file using this software.
No, It is not mandatory to have Exchange Server environment and MS Outlook installed on the machine to read OST file.

What Customers Are Saying

Verified Purchase Reviews – Free OST Viewer Tool

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