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Best Stellar Viewer for OST Alternatives ranked by AI · updated Aug 2026

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A Windows application that scans and previews the contents of Outlook OST files, including messages, attachments, contacts, calendars, and tasks. It targets users who need mailbox inspection or recovery-oriented export tools without relying on the original Outlook profile.

Developer: Stellar Price: Free viewer; paid recovery and export features available 🎯 stellarinfo.com/ost-file-viewer.php
💻 Windows Email Recovery data recovery ost viewer

Top 6 Stellar Viewer for OST alternatives

1 OSTFile.co.uk File Viewer logo

OSTFile.co.uk File Viewer

OSTFile.co.uk

An online utility for opening and inspecting Outlook OST files without configuring a full Outlook profile. It is aimed at users who...

Pros

  • Works through a web browser rather than requiring Outlook installation
  • Useful for quickly inspecting mailbox contents
  • Supports common OST mailbox data categories

Cons

  • Uploading mailbox data may create privacy and compliance concerns
  • Online processing can be impractical for large OST files
  • Typically offers fewer export and recovery controls than desktop tools

Free

Alternatives to OSTFile.co.uk File... → Visit site
5

Aryson OST Viewer

Aryson Technologies

A Windows-based application for viewing and analyzing Outlook OST files without requiring the original Exchange connection. It lets users browse common mailbox...

Pros

  • Supports browsing messages, contacts, calendars, and attachments
  • Local processing is preferable for confidential mailbox data
  • Useful for technicians handling multiple OST investigations

Cons

  • Advanced functions require a license
  • Less convenient than a browser tool for one-off viewing
  • Windows-only

Free viewer; paid export features available

Alternatives to Aryson OST Viewer → Visit site
6

GainTools OST Viewer

GainTools

A Windows utility for previewing Outlook OST mailbox files and their folders, messages, attachments, contacts, and calendar data. It serves users who...

Pros

  • Provides local access to common OST mailbox data
  • Can display attachments and folder organization
  • Useful for basic technician-led mailbox inspection

Cons

  • Advanced capabilities require a separate paid product or license
  • Windows-only
  • Less convenient than OSTFile.co.uk for quick browser access

Free viewer; paid export features available

Alternatives to GainTools OST View... → Visit site

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