SysTools OST Viewer
File reader software
- Features
- Ease of use
- Ease of management
- Quality of support
- Affordability
- Market presence
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$69 per computer
Free Trial unavailable
Free version
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- Information technology and software
- Banking and insurance
- Professional services (engineering, legal, consulting, etc.)
What is SysTools OST Viewer
SysTools OST Viewer is a Windows utility for opening and reading Microsoft Outlook Offline Storage Table (OST) files without requiring Outlook to be installed. It is used by IT staff, support teams, and end users who need to inspect mailbox data such as emails, contacts, calendars, and attachments from an OST. The product focuses on viewing and searching OST content rather than general-purpose document/PDF reading.
Opens OST without Outlook
The tool is designed specifically to read OST files, which are not natively viewable without Outlook or an Exchange profile. This supports scenarios such as mailbox inspection on machines where Outlook is not available. It reduces dependency on the original email client for basic review tasks.
Mailbox item type coverage
It typically exposes common Outlook data types such as mail, contacts, calendars, tasks, notes, and journals in a folder tree. This helps users review more than just email messages when investigating a mailbox. Attachments can be accessed from within items for inspection purposes.
Search and preview workflow
The viewer provides a preview-oriented interface to browse folders and open individual items. Basic search/filtering capabilities help locate messages or items within large OST files. This aligns with file-viewer use cases where quick inspection is more important than editing.
Narrow format support
The product is purpose-built for OST files and does not function as a general file reader across many formats. Organizations needing a single viewer for PDFs, images, and office documents will still require other tools. This limits its role compared with broad multi-format viewers in the category.
Limited export and collaboration
As a viewer-first utility, it is not designed for document-style annotation, sharing workflows, or collaboration features common in mainstream readers. Export options (if present) are typically oriented to email data handling rather than universal document standards. Teams may need additional tools for downstream processing and case management.
Windows-centric desktop utility
OST viewing utilities are commonly delivered as Windows desktop applications, which can limit use on macOS, mobile devices, or in browser-based environments. This can complicate deployment in mixed-OS organizations. Remote access scenarios may require VDI or a separate workstation for use.
Plan & Pricing
| Plan | Price | Key features & notes |
|---|---|---|
| OST Viewer (Free) | Free | Preview OST emails, contacts, calendars, tasks, notes and attachments; limited to preview (cannot save/export). |
| OST Viewer Pro | $69 (single-machine license, one‑time) | Advanced search, remove S/MIME/OpenPGP, convert/export to PDF, print emails. Includes 1 year free product updates, 24x7 support and 30-day money-back guarantee. |
| OST Viewer Pro+ | $129 (single-machine license, one‑time) | All Pro features plus export to PST, MBOX, MSG, EML/EMLX and additional export options; available as Pro+ edition on vendor site. |
Seller details
SysTools Software Pvt. Ltd.
Pune, Maharashtra, India
2007
Private
https://www.systoolsgroup.com/
https://x.com/systoolsgroup
https://www.linkedin.com/company/systools-software-pvt-ltd/
