Microsoft Outlook is a popular email and calendar software that offers advanced features for managing emails, calendars, tasks, and contacts.
Starting at $69.99/year
Best Stellar Viewer for OST and PST Alternatives ranked by AI · updated Aug 2026
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Stellar Viewer for OST and PST opens Outlook data files and previews messages, attachments, contacts, calendars, and tasks. It is intended for users who need to inspect PST or OST data without Outlook.
Top 6 Stellar Viewer for OST and PST alternatives
MailsDaddy Free PST Viewer is a free tool to open and view PST files without Outlook. It helps in viewing all emails,...
SysTools PST Viewer is a Windows utility for opening and reading Outlook PST files without installing Microsoft Outlook. It previews emails, contacts,...
Pros
- Opens PST files without requiring Outlook
- Previews emails and common Outlook data types
- Supports large PST files and attachment viewing
Cons
- Windows-focused with no native macOS or Linux version
- Free viewing features are narrower than Outlook's editing capabilities
- Less suitable than recovery tools for severely corrupted PST files
Aryson PST Viewer allows users to open and view PST files without the need for Outlook.
Pros
- Free to use
- Supports ANSI and Unicode PST files
Cons
- Limited features
5
Kernel for Outlook PST Viewer
KernelApps
Kernel for Outlook PST Viewer opens Outlook PST files and displays mailbox items such as emails, attachments, contacts, and calendars. It is...
Pros
- Free for viewing PST contents
- Supports common email, contact, and calendar data
- Useful for inspecting archives without Outlook
Cons
- Less Mac-focused than PST Bridge
- Limited export and migration functionality
- Advanced recovery features require separate Kernel products
6
BitRecover PST Viewer
BitRecover
BitRecover PST Viewer is a Windows tool for opening and reading Outlook PST files without Outlook. It displays mailbox folders, message content,...
Pros
- Provides a clear folder-based PST browsing experience
- Supports previewing attachments and multiple Outlook item categories
- Useful for users without an Outlook license
Cons
- Narrower format coverage than Outlook Viewer
- Advanced export and recovery functions are separate paid products
- Windows-only
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