8 Best OST File Viewer Software | Extreme Subject
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8 Best OST File Viewer Software
By Matt
September 4, 2020
OST File Viewer

A tool-guide for MS Exchange & Outlook users searching for an OST file viewer to search and display their existing OST file.

The content of the OST file viewed from a third party software may vary based on the software license and its restrictions. Our study of 8 best OST file viewer software is designed to find the best features that a program may need to manage, preserve, and display the authentic details from your multiple or single OST file.

OST File- Offline Folder File

OST is a Microsoft Outlook file format, the files that MS Outlook saves and stores offline. The OST files can increase their size by connecting to MS Exchange Server and by synchronizing new updates or modifications.

The file format allows the file to operate in offline mode at any time making it useful in the poor connectivity environment.

Users of MS Outlook & Exchange can face various unpredictable technical problems with these OST files unless they are managed by IT departments in their own companies or on their own.

Fortunately, locating, recovering, restoring, and maintaining these files is simple with third-party software and it does not require a technical background to install the software and work on it to manage or view your OST files.

Nevertheless, not all of the software comes with the same features so you have to go through the features offered by different software and determine which software is perfect for you.

8 Best OST File Viewer

Name List & Other Comparisons

Name FAQ’S Support Review on Trust-Pilot
Stellar Best OST Viewer Software Y Y 1200+
Kernel OST Viewer Y Y 0
Sys Tools Y Y 20+
Bitrecover Y Y 5+
OST File Recovery Y Y 10+
OST PST Viewer N Y 0
Turgs OST File Viewer Y Y 0

Stellar Best OST Viewer Software

Major Features

  • Read OST File Components- Email Attachments, Contacts, Calendars Etc.
  • Read Large OST Files & Convert to PST – No File Size Limitation.
  • View Corrupted and Encrypted OST Files & Convert into PST Files.
  • Supports Outlook 2019, 2016, 2013, 2010, 2007, 2003, 2002, And 2000

Other Features

  • Complete Preview of Mailbox Items
  • Read OST File in Microsoft Outlook
  • Export OST File to Different File Formats
  • Convert OST File to Office 365
  • Converts OST File to PST
  • Converts All Mailbox Items
  • Preview All Recoverable Items
  • Converts Encrypted OST files
  • Save & Load Scan Information
  • Multiple Saving Options
  • Supports All Outlook Versions
  • Batch File Conversion
  • Converts multiple OST files to PSTs
  • Compacts & Splits PSTs
  • Exports to Live Exchange
  • Directly Exports to Office 365
  • Multiple Saving Options
  • Exports Outlook Contacts 

Kernel OST Viewer

Major Features

  • Opening OST mailbox items without Exchange profile/connection
  • Viewing orphan, corrupt and healthy OST files without Outlook
    Viewing email data by Date, From, To, etc.
  • Viewing attachments of OST file emails
    Saving OST email list in HTML format
  • Viewing analytical reports on OST file content
  • Access OST Files Without Exchange Server
  • Support for all versions of MS Outlook (2016, 2013, 2010, 2007, 2003, 2002, 2000, 98, and 97)

Other Features

  • Support for all versions of MS Exchange Server (2019, 2016, 2013, 2010, 2007, 2003, 2000, 5.5, and 5.0)
  • Find and Open Emails
  • Saves Email List in HTML
  • Opens All Kinds of OST Files
  • Search OST Files
  • Open Multiple OST Files
  • Generates File Analysis Report

Sys Tools

Major Features

  • Preview OST Email Along With The Attachments Associated With It
  • Scan and Open Corrupt or Orphan OST File via Advanced Scan Mode
  • Sort OST Emails by Attributes: From, To, Subject, Sent, Size, etc.
  • Add Multiple OST Files One by One & Open Item in an In-built Viewer
  • Exchange Server Environment is Not Required to Open and Read OST Files
  • Advance Scan Mode to Recover Deleted OST File Items
  • Reload The Saved Scan File and View OST File in Just a Few Seconds
  • View Read/Unread Message Status Directly from The Software’s Interface
  • Get Free Installation on Multiple Computers and Personal System
  • Supports OST File of The Latest Microsoft Outlook 2019 and All The Prior Versions
  • Support Windows OS All The Versions: Windows 10, 8.1, 8, 7 etc.

Other Features

  • Preview Multiple OST Files
  • View Email Attachments
  • Advanced Scan and Save Scan Mode
  • No Pre-Requirements
  • OST Contacts Viewer
  • OST Calendar Viewer
  • Sort OST File Data By Attributes
  • Optimized OST Viewing
  • Set Naming Pattern For PDF
  • Export OST Files to PDF
  • Save Selective Files or Folder


Major Features

  • Allows to preview calendar information from selected OST files
  • OST document viewer also opens Tasks, Journal as well as Deleted Items in software panel.
  • This software permits to view all Folders and Subfolders of selected Microsoft OST file
  • Dual option to read email information as Message Preview and Attachments Preview
  • ANSI and UNICODE file formats of Outlook .ost data files are fully supported by this tool.
  • A forensically sound ost file viewer, which performs read-only scan of your ost file.
  • Portable OST viewer provides option which allow users to view and open .ost files free

Other Features

  • Microsoft Outlook installation is not necessary in order to view ost files.
  • OST file viewer displays as well as maintains read and unread status of emails
  • Allows to maintains the formatting of message during message preview.
  • Allows users to view Contact Details, along with Contact Photo.
  • Supports all .ost file formats having No Encryption, Compressible Encryption and High Encryption.
  • Tested tool to work on large .ost files. OST file viewer has the capability to view files ranging from 2 GB to 30 GB.
  • Supports and designed to work on both Windows and Mac platform.

OST File Recovery

Major Features

  • Three different modes for OST file recovery: Standard, Advanced & Deep
    Smartly converts OST to PST, OST to DBX, OST to EML, OST to MSG, OST to MBOX
  • Supports Outlook Encryption & Compression to recover maximum and accurate data
  • Recovers Outlook mail items like Email, Task, Calendar, Contacts and Distribution Group etc.
  • Date Range option to save the recovered data within a desired date range
  • Supports recovery of Non-English and right to left characters from corrupt OST file
  • Provides fastest scanning speed and saves a LOG file of OST recovery process.
  • Compatible with MS Outlook 2016, Windows 10 and all the earlier versions.
  • Free OST file recovery software shows you a Preview of the recovered OST files.

Other Features

  • Complete OST File Recovery
  • Recover Encrypted OST file
  • Effective OST Recovery Modes
  • Save OST File in Multiple File formats
  • Restore Permanently Deleted Emails
  • Date Range Saving Option
  • Search Outlook Mailbox Items
  • Smart Preview of Recovered OST Files
  • Handle Align Errors in OST Files
  • OST File Recovery Snapshots
  • Recover Non-English Characters
  • Creates Log File
  • Export Log to HTML Feature
  • Open OST in Multiple Platforms

OST PST Viewer

Major Features

  • Advanced Search in OST and PST files.
    Copy any information you need from PST or OST file.
  • Copy any item, field or text from Microsoft Outlook file and paste it to a location of your choice.
  • Export and convert selected items to MSG, VCF, iCal file format.

Other Features

  • Move a folder to another PST file
  • Convert OST to PST file
  • Print items you are viewing
  • Open attachments directly from OST PST Viewer
  • Save email attachments to your PC
  • Manage messages and other items
  • Change the follow- up, read/unread status, reply- to messages


Major Features

  • 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

Other Features

  • Free OST Viewer Tool
  • Preview Option – Dual
  • Display Proper Information
  • Supported by Windows
  • Easily runs without Outlook
  • Simple GUI
  • Retain Folder structure
  • Opens Orphan OST

Turgs OST File Viewer

Major Features

  • Scan, open, and view corrupted, password-protected, and encrypted OST files.
  • View complete OST items such as emails, contacts, calendars, etc with all properties.
  • Open All Types of Offline OST Files
    Independent OST Viewer Application

Other Features

  • View Orphaned and Disconnected OST Files
  • View Highly Encrypted and Password-Protected Files
  • Easy Graphical User Interface to Operate

Wrapping Up

The top four software on the list are prominent and has been used by millions of users. An ideal OST file viewer software can surpass your standards by allowing you to save and access your OST file with various options.

All the features mentioned of the respective OST file viewer software reflect the diverse capabilities of that program.

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