Free OST Viewer Tool Open Orphaned OST Files without Outlook & Preview Emails, Contacts, Calendars

4.1 (16 Reviews) [ Rate It... ]

  • Free Preview all Outlook OST file items like Emails, Contacts, Calendars, Tasks, Notes
  • Independent solution to View OST file emails with list of all inserted attachments
  • Provides Item count for each folder & subfolder of selected Outlook OST file
  • Open and View Bulk Outlook OST Emails with Emails Folder structure viewer of OST
  • Best software for Forensic investigation and Examine as freely view any OST file
  • OST file viewer displays as well as maintains read and unread status of emails
  • Support All Versions of Microsoft Windows and Apple Mac or Mac OS Operating System.
  • Open all OST Files having No Encryption, Compressible Encryption and High Encryption.

Download For Windows Download For Mac

Convert OST Files to Various Formats

Features & Benefits


100% Free & Standalone OST Viewer Tool

The best OST Viewer is designed in such a way that one can use it directly to open the Outlook OST files without installation of Outlook. The OST Viewer is 100% free to use and is available separately for both Windows as well Mac Operating Systems. Just Download & Install the supported setup files of this free Outlook Viewer and read the information and content written in OST emails.


View OST file with all Inserted Attachments

The utility gives easy for the users who are looking to open the attachment files included with the Outlook OST file emails as this free utility provides separate tab to open all the attachment files inserted with the Outlook emails. It will display all the OST file email headers, content, information, embedded objects and all inserted attachment files in its panel without making any changes in the actual data.


Open Unlimited OST Archives & Files

The utility provides option to open multiple Outlook OST files at one by one in the utility panel. User can also view the Outlook contacts information with the help of this utility. Just click on Add File option of this utility and then the utility will browse you to select the Outlook OST files one by one. Choose any required OST file and then click on Open button to read its information and content.


Open & Preview all type of OST Files

The freeware supports all types of Outlook OST files to open and read their information. One can open and read the information from any Password protected, inaccessible, highly encrypted, compressible Outlook OST file very easily. The utility supports UNICODE as well ANSI OST file of older Outlook version to open the emails, attachments as well Contacts information.


Best Utility for Digital Forensic Analysis

The OST email Viewer is best for the forensic experts and email analyze purpose. The forensic OST Viewer displays all the required information like From, To, Subject, Sent Date, Receive Date, and other email headers. In case if someone’s Outlook OST file gets corrupted and a user wants to read its information then this Best OST Viewer also allows to open the file.


No OST File Size Limitation Imposed

The quick OST Viewer open source offers no OST file size limitation to open in the application panel. One can open the Outlook 2016, Outlook 2013, Outlook 2010, Outlook 2007, Outlook 2003 etc. file of any size without showing any error. The best OST Viewer tool is completely free to use and there are no hidden charges for the users to use this tool to read files.

Outlook OST Viewer System Requirement

Download For Mac

Meet following minimum System Requirement for the working of OST Viewer Software.  

  • Program Name: Outlook OST Viewer Tool
  • Version: 2.0
  • System Requirement: Pentium II 400 MHz, 64 MB RAM, Minimum 30 MB Space
  • Operating System: Windows 10, 8.1, 8, 7, Vista, XP etc
    Windows Server 2016, 2013, 2000
Screenshots of Outlook OST Viewer
OST preview

Step 1 : Run OST Viewer on Mac or Windows & load OST Files from source location.

Open OST on Mac

Step 2 : Click on any email or message of OST file to preview its all content

preview Outlook OST

Step 3 : One can also view Calendars and Contacts information in application panel

How to Open Orphaned OST Files without Outlook?

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16 Ratings
Britney Patt
Wow! I can preview OST file items over the cross-platform.
Woo Han
The software generate preview of Outlook OST files with all information and details of emails, contacts, calendars, tasks, notes, journals etc.
Nickole Jedi
It is one of the best OST file Viewer available for free of cost which allows to open OST files without Outlook.

Frequently Asked Question...

  • How to View Outlook OST Files without Exchange Connectivity?
    • OST file Viewer is a very advanced approach to open or preview contents of OST files without Outlook or Exchange Connectivity. Just follow these quick steps to preview OST files instantly.

      1. Download & Run Free OST File Viewer Software.
      2. Load OST files from source OST file or at default Outlook profile location.
      3. Click on any folder to load their messages in application panel. Select any message to view all its information.
      4. One can select attachments tab to view the list of attachment files.
      5. Click on Upgrade option to enable saving options for OST files.
  • What is OST File & How they perform their working?
  • I have a OST file, and when I try to open it in Outlook it displays the message, ‘the file cannot be accessed in Outlook’. I think it is due to the corruption in the file but I urgently required to read the information written in the OST file. Does your utility allow me to open the corrupted or inaccessible OST files?
  • Does this utility supported upon Mac OS?
  • Does this software offers any in-app purchase or is completely free to use?