Open and view 50+ file formats including PST, OST, MBOX, EML, MSG, vCard, ICS and more without installing the original software applications.
Univik File Viewer is a free Windows application that allows you to open, view and search through 50+ file formats without requiring the original software. For example, you can view PST files without Microsoft Outlook, MBOX files without Thunderbird and vCard files without any contact management software.
Key capabilities: Open email archives (PST, OST, MBOX, EML, MSG), view contacts (vCard/VCF), browse calendar files (ICS), preview attachments (images, PDFs, documents), search within files and print content, all from a single, lightweight application.
Best for: IT professionals recovering data, legal teams reviewing email evidence, users who received email files but don't have the original application, anyone migrating between email platforms.
Supported Formats
Click on formats with dedicated pages for detailed information and tutorials.
DBX Files
Outlook Express Database
OLM Files
Outlook for Mac Archive
NSF Files
HCL Lotus Notes Storage
EMLX Files
Apple Mail Message
MHT Files
Web Archive Format
And 40+ more formats supported including TBB, MBS, MBX and proprietary email formats.
Powerful Features
Enterprise-grade features in a completely free application.
Open PST without Outlook, MBOX without Thunderbird, vCard without contacts apps. View any supported file format independently.
Preview images, PDFs, documents and other attachments directly within the viewer. Save attachments to your computer with one click.
Search by sender, recipient, subject, date range or keywords. Find specific emails instantly within large archives.
View the complete folder hierarchy exactly as it appears in the original application. Navigate through Inbox, Sent, Drafts and custom folders.
Print individual emails or batch print entire folders. Export selected items to various formats (upgrade feature).
Open and view files of any size, from small EML files to 50GB+ PST archives. Optimized for large files with minimal memory usage.
Simple & Fast
Get started in under 2 minutes with these simple steps.
Download the free installer from our website. Only 25MB.
Run the installer. Setup takes less than 1 minute.
Click "Add File" and select your PST, MBOX or other file.
Browse folders, preview emails, view attachments and search.
Who Uses File Viewer
Recover data from backup archives, troubleshoot email issues and assist users without installing full email clients on every machine.
Review email evidence for litigation, compliance audits and eDiscovery without modifying original files. Search and print specific communications.
Preview email archives before migration. Verify data integrity and identify important emails when switching email platforms.
Access old email backups from previous jobs or old computers. Find important documents and communications from years past.
Examine email files in forensic investigations without altering original data. Create documentation and reports from email evidence.
Open email files received from colleagues without having their email client. Quick viewing of attachments and forwards.
Why We're Different
| Feature | Univik File Viewer | Other Free Viewers | Original Software |
|---|---|---|---|
| Cost | ✓ Free | ✓ Free | $99-$439/year |
| Multiple Format Support | ✓ 50+ formats | 1-3 formats | 1 format only |
| No File Size Limit | ✓ Unlimited | Often limited | ✓ Unlimited |
| Attachment Preview | ✓ Full support | Limited/None | ✓ Full support |
| Advanced Search | ✓ Multi-criteria | Basic only | ✓ Multi-criteria |
| Installation Size | ✓ 25 MB | ✓ 10-50 MB | 500 MB - 4 GB |
| Orphaned OST Support | ✓ Yes | No | No |
User Reviews
"Saved me from buying Outlook just to view some old PST backups. The search feature found exactly what I needed in seconds."
"We use this for eDiscovery work. Being able to view multiple formats without installing different software is incredibly efficient."
"Finally opened my old Thunderbird emails after switching to Outlook. The MBOX viewer worked perfectly with all my folders intact."
Technical Details
Operating System
Windows 11, 10, 8.1, 8, 7 (32-bit and 64-bit)
Processor
1 GHz or faster (Intel/AMD)
RAM
4 GB minimum (8 GB recommended for large files)
Disk Space
100 MB for installation + space for temporary files
.NET Framework
.NET Framework 4.5 or higher (included in installer)
Common Questions
Yes! Univik File Viewer is specifically designed to open files without requiring native applications. Simply download the free viewer, add your file and you can view file content. This works with both ANSI and Unicode PST files of any size.
Univik File Viewer supports 50+ file formats including:
View the complete format list above for all supported types.
Yes, the viewer is 100% free with no limitations on viewing functionality. You can:
Premium features like exporting/converting files to other formats are available in our paid converter products.
Yes! Unlike Outlook, which requires an active Exchange connection to open OST files, Univik File Viewer can open orphaned OST files independently. This is perfect for:
Yes, full attachment support is included. You can:
Univik File Viewer is 100% safe and operates in read-only mode. It will never modify, alter or damage your original files. The software is:
Open 50+ file formats without original software.
Download Now, It's FreeVersion 5.0 | 25 MB | Windows 7/8/10/11 | No registration required
Need Help or Have Questions?
Our support team is available 24/7 to help you with installation, usage or any questions.