Skip to main content
Prism MigrationPrism Migration

PST to MBOX Converter

Free trial Buy License $39

PST to MBOX Converter

High-performance desktop utility to convert Outlook PST mailboxes into spec-compliant MBOX (mboxrd) archives compatible with Mozilla Thunderbird, Apple Mail, Postbox, and Unix mail clients with complete attachment and MIME header preservation.

  • Convert Outlook PST to Standard MBOX
  • No Microsoft Outlook Required
  • Maintains Complete Folder Hierarchy
  • Full Attachment & Metadata Preservation
  • Available for Windows and Mac
  • Local On-Device Conversion

Free trial: 50 items per folder.

Buy Personal — $39
One-time payment Encrypted checkout No recurring fees
PST to MBOX Converter · Local Sandbox
Verified 64-Bit
Source File Valid
Takeout_Mail.mbox
Outlook Data File (.pst)
Integrity: SHA-256 Passed
Local Engine
Export Formats 6 Ready
PDF PDF
MBOX
EML
O365
Gmail
CSV CSV
All Supported Formats →
✓ Folder Tree Intact
✓ Attachments Kept
✓ Zero Outlook DLLs
100% Offline Machine Processing View 6-Step Guide
Available for Windows 11 / 10 System requirements

PST to MBOX Converter features

Find the capabilities that matter to your task, from supported formats to processing options.

Formats and mailbox content

  • Direct in-memory PST parsing engine with zero dependency on Microsoft Outlook, Exchange Server, or MAPI DLLs
  • Spec-compliant mboxrd format output with proper >From quoting to prevent Thunderbird index corruption
  • Seamless compatibility with Mozilla Thunderbird, Apple Mail, Postbox, Opera Mail, and Linux mail spools
  • Complete attachment serialization inside MIME multipart boundaries using standard Base64 encoding
  • Multi-tab item inspector previewing sandboxed HTML, plain text, RFC 822 headers, and raw hex streams

Filters and file organization

  • Tri-state selective mailbox folder tree with dynamic unread/read count badges and instant filtering
  • Granular 6-tab filter engine: Date Range, Sender/Recipient match, Keyword query, Attachment filters, and Deduplication

Account access and automation

  • Dedicated folder-to-MBOX mapping preserving Outlook mailbox hierarchies into clean individual .mbox files

Processing and job recovery

  • Full MIME RFC 2822 header preservation: Message-ID, In-Reply-To, References, and custom headers for threaded discussions
  • Interrupted Migration Resume Center powered by SQLite transaction checkpointing for zero data duplication
  • Multi-threaded Producer-Consumer worker engine scaling throughput up to 45 GB/hr across CPU cores

System compatibility

  • Full Unicode fidelity preserving international languages (UTF-8, Arabic, Cyrillic, Chinese, Japanese, Hindi)

Reports and data handling

  • Comprehensive post-conversion executive summary report tracking exported records, skipped items, and file sizes

Need a closer look at a specific capability?

View all PST to MBOX Converter features →
Official Video Walkthrough

See PST to MBOX Converter in action

Watch our step-by-step walkthrough to verify offline mailbox parsing, real-time message previews, and zero-cloud conversion workflows before evaluating your own archives.

PST to MBOX Converter · Official Video Walkthrough (1:07)
1080p HD
PST to MBOX Converter video guide preview
Duration: 1 min 07 sec
100% Offline Engine
Standalone: Operates with zero cloud upload & no Outlook installation
Watch on YouTube

Video Chapters & Key Steps

Click to jump to time
Verified Local Execution Guarantee All demonstrations in this walkthrough reflect the authentic desktop engine. The free trial allows you to convert up to 50 items per folder with full attachment and hierarchy preservation.

Evaluate PST to MBOX Converter before you buy

Use the free trial to check whether the result fits your task. Here is what to look for when testing your own data.

  1. Select a representative archive

    Choose a file containing folders, attachments, and character encodings typical of your mailbox. Keep your source file safe.

  2. Configure target format and test split

    Select your desired export format (PDF, MBOX, or cloud migration) and set split thresholds if partitioning large archives.

  3. Verify output formatting and structure

    Open the exported files in your target email client or document reader. The free evaluation converts 50 items per folder to verify fidelity.

System requirements

Check your computer before installing PST to MBOX Converter. Allow additional storage for your source files and output.

Download the free evaluation →

Trial limit: 50 items per folder.

View current product specifications →

Choose your PST to MBOX Converter license

Transparent one-time pricing with dedicated multi-year updates & zero recurring fees.

Personal License

$39

1-Year License & Updates

One-time payment • Zero recurring fees

Buy Personal License
  • 2 PCs / 2 Macs Workstation Activation
  • Up to 10 Source Files (100 GB Cap)
  • Export to MBOX with Complete Attachments
  • Zero Cloud Relay — 100% On-Device Processing
  • 1 Year Free Software Updates & Patches
  • Standard Email & Web Support
Most Popular

Business License

$99

2-Year License & Updates

One-time payment • Zero recurring fees

Buy Business License
  • 5 PCs / 5 Macs Workstation Activation
  • Up to 50 Source Files (500 GB Cap)
  • Folder-to-MBOX Mapping & Batch Mode
  • Batch Folder Mode (Up to 50 Files Queue)
  • Full MIME Header & Threading Preservation
  • 2 Years Free Software Updates & Patches
  • Priority 24/7 Technical Support

Enterprise License

$299

3-Year License & Updates

One-time payment • Zero recurring fees

Buy Enterprise License
  • 10 PCs / 10 Macs Workstation Activation
  • Up to 250 Source Files (2.5 TB Cap)
  • Folder-to-MBOX Mapping & Consolidated Mode
  • Unix Mail Spool & eDiscovery Bulk Output
  • Commercial & MSP Client Servicing Rights
  • 3 Years Free Software Updates & Patches
  • Dedicated VIP 24/7 Support with Remote SLA
Compare all license specifications & capabilities in detailed matrix

PST to MBOX Converter: frequently asked questions

All 7 technical & workflow FAQs
Can I convert PST files to MBOX without installing Microsoft Outlook?

Yes. Prism PST to MBOX Converter features an autonomous B-Tree parser that extracts email data directly from PST files without requiring Outlook, MAPI DLLs, or Exchange Server.

Are email attachments preserved when converting PST to MBOX?

Yes. Attachments are encoded directly into the MBOX messages using standard Base64 MIME multipart boundaries, allowing Mozilla Thunderbird and Apple Mail to open and save attachments natively.

How do I import the converted MBOX files into Mozilla Thunderbird?

You can import converted MBOX files into Thunderbird using Thunderbird's built-in Import tool or the ImportExportTools NG add-on, placing them directly into Local Folders.

Can I import the converted MBOX files into Apple Mail on Mac?

Yes. In Apple Mail, select File > Import Mailboxes, choose 'Files in mbox format', and select the exported MBOX files or folders.

Will email folder structures be preserved?

Yes. The converter creates dedicated MBOX files named after your Outlook folders (e.g., Inbox.mbox, Sent_Items.mbox, Projects.mbox), preserving your organizational structure.

Does the converter prevent MBOX corruption from lines starting with 'From '?

Yes. The software enforces standard mboxrd escaping, properly prefixing '>From ' to any body line that starts with 'From ' to prevent client parsing errors and broken message boundaries.

What happens if my conversion process is interrupted?

The integrated SQLite transaction checkpointing records every processed message in the migration_progress table. When you restart the application, the Resume Center will automatically detect incomplete sessions and continue from where it stopped without duplicating items.

Need more detail?

All features → Step-by-step guide → System requirements → Release notes → Ask a question →
How can we help you?