Free OST Viewer Tool Box

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Free OST Viewer - Tool to View OST Files

Free tool for Windows and Mac OS

  • OST Viewer is free tool to view OST files without Outlook installation
  • View corrupted Offline OST file with Attachments in one go
  • OST Viewer for Mac as well as Windows OS is available for free
  • Preview of Attachments, Contacts, and Events also available with same folder hierarchy
  • Support files saved in external and USB drives

Download for Windows
For Win 10/8.1/8/7/Vista/XP
Download for Mac
For Mac OS X

(Note - Before Installation of OST Viewer, Java Runtime Environment Must be Installed, Click here to download.)

OST Viewer Freeware

OST file is basically MS Outlook file which is created when one wished to work Offline. OST viewer is the tool to view offline OST file and that too without having Outlook. There will be No data loss, moreover it will recover the corrupted/damaged OST files to give its perfect view. Maintains the folder hierarchy and keeps the formatting of emails like To: From: Cc: Sub: etc unchanged. Allows to read OST files which are password protected. Allows to open as many as OST files without Outlook installation there is no limitation over it.

Features-List of OST Viewer

  • Supports ANSI/UNICODE
  • Healthy View OST Files
  • No Need of Outlook installation
  • Support Windows & Mac OS
  • Maintains Folder Hierarchy
  • Separate Section for Attachment
  • Install Java Runtime Environment
  • Formatting Unchanged
  • Also Support to Read PST Files

Steps to View Outlook OST Files

  • Step 1 - Launch OST Viewer Software.
  • Step 2 - Click on "Select OST File" and browse the OST file.
  • Step 3 - Open Outlook Offline OST file with attachments and other formatting.

Open OST File

View Outlook OST Files without Outlook

Program Name:
Free OST Viewer
File size:
1.12 MB
Program Type:
System Requirements:
Pentium II 400 MHz, 64 MB RAM, Minimum 30 MB Space
Operating System
Windows OS and Mac OS
Required Java Run Time Installer:
Must Install Java Run Time Environment Installer
Q: Will there be any data loss or any kind of change will be experienced due to this software?

A:No, there will be no data loss and it will also support corrupted files.

Q: Do I need to install outlook to before its installation?

A: No, OST Viewer allows to read OST files without Outlook.

Q: How much will it cost to me?

A: Tool is absolutely free of cost and doesn't cost a penny.

Q: Will this tool Open Password Protected and corrupted OST File?

A: Yes, Software will also support to Open and Read the emails of Corrupted/damaged and Password Protected OST Files with ease.

Software Supported Features

supports all Windows Version

Awards & Ratings


100% Safe & Secure

100% safe and secure tool


I tried this software for Mac and had good experience. Best thing is, it is available for free.

- Josephine, Spain