OST Viewer: Open Outlook OST Files Without Outlook

OST Viewer software to view, open and read OST files instantly.

**FREE DOWNLOAD (v1.2)** File Size: 1978KB | Safe & Verified

Utility Security Freeware

Key Features

Free OST viewer tool to help you view OST files easily without connecting to MS Exchange Server.
Administrators often face the heat of the situation when they have to look out for some important data in OST.
Unfortunately, there is no such software or utility offered by Microsoft.

Technical Specifications

**Publisher:** https://www.ostviewer.com
**License:** Freeware
**Operating System:** Windows 7, Windows 8, Windows 10, Windows 11
**Last Updated:** October 15, 2025
**Category:** Utilities / File Managers

User Rating

Based on 82 reviews.