Outlook PST Univik PST File Converter

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Convert Outlook PST files without Outlook

Univik PST Converter opens and converts Microsoft Outlook PST files into 15+ formats. No Outlook installation required. Extract emails, contacts, calendars, and tasks with complete attachment preservation.

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 Buy Now - $49

*Free trial exports first 25 items per folder. Full version for unlimited conversion.

  • No Outlook Required: Open and convert PST files on any Windows PC without Microsoft Outlook or Office subscription.
  • 15+ Export Formats: Convert to EML, MBOX, MSG, PDF, HTML, RTF, TXT, EMLX, plus Gmail, Office 365, and IMAP upload.
  • Complete Data Extraction: Emails, attachments, contacts, calendars, tasks, notes, and journal entries fully preserved.
  • 100% Offline & Secure: Desktop software processes files locally - your Outlook data never leaves your computer.

Univik PST Converter Box

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Certified Clean by 70+ Antivirus Engines. No malware, spyware, or adware.

 What We Extract From Your PST File

 Understanding the Challenge

Why Convert PST Files?

PST files are powerful Outlook archives, but they lock your data into the Microsoft ecosystem. Converting unlocks your emails for universal access.

Common Reasons to Convert PST Files:

🔄 Migrating to Thunderbird 🍎 Moving to Mac/Apple Mail ☁️ Uploading to Gmail 💼 Creating PDF Archives 💰 Avoiding Outlook License ⚖️ Legal eDiscovery
🔒

The Challenge: Outlook Lock-In

Your PST file contains years of valuable email data, but accessing it has limitations:

  • PST is Microsoft's proprietary format - not readable by other email clients
  • Requires Outlook or Office subscription ($150+/year) to open
  • Windows-only - Mac and Linux users can't access PST directly
  • No cross-platform portability - can't easily share or migrate emails
  • Large files cause issues - PST corruption risk increases with size
✅

The Solution: Univik PST Converter

Our software liberates your data by converting PST to universal formats:

  • Opens PST without Outlook - standalone parser, no dependencies
  • 15+ output formats - EML, MBOX, PDF, MSG, HTML and more
  • Cross-platform exports - MBOX for Mac, EML for any client
  • Selective conversion - choose specific folders, not everything
  • Handles any PST size - tested with 50GB+ files

 Export Options

Convert PST to 15+ Formats

Export your Outlook data in the format that best suits your destination platform or archival needs.

📁

.PST

Outlook Archive

→

⚙️

Univik

Converter

→

📄

EML, MBOX, PDF...

Universal Output

 Available Export Formats

Email Formats

Universal Email

EML, EMLX, MBOX, MHT

EML for any email client. MBOX for Thunderbird/Mac. EMLX specifically for Apple Mail import.

Most Versatile
Outlook

Outlook Formats

MSG, OST

Individual MSG files for specific emails. Convert between PST/OST formats for Outlook compatibility.

Outlook Users
Document

Document Formats

PDF, HTML, RTF, TXT

PDF for legal compliance and permanent archives. HTML for web viewing. TXT for data extraction.

Archival

Cloud Upload

Gmail, Office 365, IMAP

Direct upload to Gmail or any IMAP server. Migrate PST archives to cloud without intermediate files.

Cloud Migration

 Key Features

Why Choose Univik PST Converter

Professional-grade software designed to handle any PST file with precision and reliability.

Open PST Without Outlook

Our standalone PST parser reads Outlook data files independently. No Microsoft Outlook, Office subscription, or Exchange connection required. Access PST archives on any Windows PC.

Batch PST Processing

Load multiple PST files simultaneously. Convert entire collections in one operation. Perfect for IT departments handling employee archives or migrations involving many PST files.

Selective Folder Export

Don't need everything? Browse the PST structure, select only the folders you want (Inbox, specific projects, date ranges), and convert just those. Skip unwanted data entirely.

Data

Complete Data Preservation

All email properties preserved: attachments, embedded images, HTML formatting, headers, read/unread status, timestamps, categories, flags, and importance levels. Nothing lost in conversion.

Large Files

Handle Large PST Files

Optimized for massive archives. Process PST files up to 50GB+ without crashes or memory issues. Streaming architecture means consistent performance regardless of file size.

Built-in PST Viewer

Full preview without converting: browse folders, read email content, view attachments, inspect headers. Works as a standalone PST viewer even if you never export anything.

Unicode

Unicode & ANSI PST Support

Handles both modern Unicode PST (Outlook 2003+) and legacy ANSI PST formats. Full international character support including Chinese, Japanese, Arabic, Hebrew, and Cyrillic.

Recover Deleted Items

Advanced scanning finds soft-deleted emails that still exist in the PST file. Recover accidentally deleted messages that haven't been permanently purged from the archive.

 Migration Scenarios

Popular PST Migration Paths

See how professionals use Univik PST Converter for common email migration and archival scenarios.

🔄 Scenario 1: Outlook to Thunderbird

Source: Outlook PST

Years of emails in Outlook archive. User wants to switch to free, open-source Thunderbird.

Target: MBOX

Convert PST to MBOX format. Import into Thunderbird using ImportExportTools extension. All folders preserved.

Conversion Time (10GB PST):

~15 minutes

🍎 Scenario 2: Windows to Mac Migration

Source: Outlook PST

Switching from Windows PC to Mac. Need to access old emails in Apple Mail.

Target: EMLX / MBOX

Convert to EMLX for direct Apple Mail import or MBOX for universal Mac client compatibility.

Conversion Time (10GB PST):

~15 minutes

⚖️ Scenario 3: Legal Discovery

Source: Outlook PST

Law firm needs to produce emails for litigation. PST from former employee or client.

Target: PDF

Convert specific date ranges to PDF with full headers preserved. Bates numbering ready.

Conversion Time (10GB PST):

~30 minutes (PDF rendering)

☁️ Scenario 4: PST to Gmail

Source: Outlook PST

Company moving from on-premise Exchange to Google Workspace. Old PST archives need migration.

Target: Gmail Upload

Convert and upload directly to Gmail via IMAP. Labels created from folder structure.

📁 Scenario 5: Archive Individual Emails

Source: Outlook PST

Need to extract specific emails as standalone files for sharing or archiving.

Target: EML / MSG

Export as individual EML (universal) or MSG (Outlook format) files. One file per email.

💼 Scenario 6: No Outlook License

Source: Outlook PST

Received PST backup but don't have Outlook installed. Need to access the emails.

Target: HTML / PDF

Convert to HTML for web browser viewing or PDF for permanent archive. No email client needed.

 How It Works

Convert PST Files in 4 Simple Steps

Intuitive interface makes PST conversion effortless - no technical expertise required.

Quick Start Guide

  1. Download & Install: Get Univik PST Converter and install on Windows. Takes under a minute.
  2. Locate Your PST: Usually at Documents\Outlook Files\ or use our auto-detect feature.
  3. Add PST File: Click "Add File" and browse to select your Outlook PST archive.
  4. Explore Contents: Browse folder tree. Preview emails before deciding what to convert.
  5. Select Folders: Check the folders you want. Export all or select specific ones only.
  6. Choose Format: Pick output format based on your target platform (EML, MBOX, PDF, etc.).
  7. Convert: Click Convert button. Watch progress for large PST files.

 Technical Insight

Inside Your PST File

Understanding PST file structure helps appreciate what we extract and why specialized software is required.

📧

Message Store

Email messages with MAPI properties including headers, body (HTML/RTF/plain), and inline content stored in B-tree structure.

📎

Attachment Table

Binary attachment data with metadata: filenames, MIME types, sizes, and modification dates all preserved.

📁

Folder Hierarchy

Complete tree: Inbox, Sent Items, Drafts, Calendar, Contacts, Tasks, Notes, Journal, and all custom folders.

📇

Contact Records

Address book entries with names, emails, phones, addresses, photos, and custom fields in vCard-compatible format.

📅

Calendar Events

Appointments, meetings, recurrence patterns, attendees, reminders. Export to ICS for cross-platform calendars.

🔐

Encryption Layer

Optional password protection (we handle it). Compressible/High encryption modes supported with password.

PST File Technical Specifications

  • File Format: Microsoft Personal Storage Table (PST)
  • Max Size (ANSI): 2GB (Outlook 2002 and earlier)
  • Max Size (Unicode): 50GB default, 4TB with registry edit
  • Structure: B-tree based with node/block architecture
  • Encryption: None, Compressible, or High (password-based)
  • Default Location: %USERPROFILE%\Documents\Outlook Files\
  • Created By: Microsoft Outlook 97 through current versions
  • MIME Type: application/vnd.ms-outlook-pst

 Customer Reviews

What Our Customers Say

Real testimonials from professionals who converted their PST archives using Univik PST Converter.

 Comparison

How Univik Compares

See why professionals choose Univik PST Converter over alternatives and manual methods.

Feature Univik PST Converter Free Online Converters Manual Export (Outlook) Open Source Tools
Opens PST Without Outlook ✓ Yes ✓ Yes ✗ Requires Outlook ~ Some tools
Batch Processing ✓ Unlimited ✗ One file at a time ~ Limited ~ Varies
Large PST Support (50GB+) ✓ No limit ✗ 50-100MB max ~ Crashes often ~ Unreliable
Output Formats 15+ formats 2-3 formats Limited options 3-5 formats
Attachment Preservation ✓ 100% ~ Often lost ✓ Yes ~ Varies
Folder Structure Maintained ✓ Complete ✗ Flattened ✓ Yes ~ Partial
Data Privacy ✓ 100% Offline ✗ Uploads to server ✓ Local ✓ Local
Preview Before Convert ✓ Full preview ✗ No ✓ In Outlook ~ Basic
Selective Folder Export ✓ Yes ✗ All or nothing ✓ Yes ~ Limited
Calendar/Contact Export ✓ ICS, vCard ✗ Email only ~ Separate process ~ Varies
Deleted Item Recovery ✓ Yes ✗ No ✗ No ✗ No
Technical Support ✓ 24/7 Live Chat ✗ None ~ Microsoft forums ~ Community
Price $49 (Lifetime) Free (with limits) $150+/year (Office 365) Free

⚠️ Why Avoid Free Online Converters?

  • Your emails are uploaded to unknown servers
  • File size limits (usually 50-100MB)
  • No batch processing capability
  • Attachments often corrupted or lost
  • No support if something goes wrong

⚠️ Why Not Use Outlook's Built-in Export?

  • Requires Outlook license ($150+/year)
  • Limited format options
  • Crashes with large PST files
  • No MBOX or EML export
  • Can't recover deleted items

✓ Why Choose Univik?

  • No Outlook needed - saves $150+/year
  • Handle any PST size (tested 50GB+)
  • 15+ output formats
  • 100% offline - your data stays private
  • One-time $49 - lifetime license

 Target Platforms

Where Your PST Data Can Go

Convert once, access everywhere. Your PST emails can migrate to any of these platforms.

Thunderbird

Mozilla Thunderbird

via MBOX

Apple Mail

Apple Mail

via EMLX/MBOX

Gmail

Gmail

via IMAP upload

Office 365

Office 365

via IMAP upload

Windows Mail

Windows Mail

via EML

eM Client

eM Client

via EML/MBOX

Postbox

Postbox

via MBOX

Mailbird

Mailbird

via EML

📄 PDF Viewers

Adobe Reader, any PDF app

🌐 Web Browsers

HTML export for any browser

📝 Text Editors

TXT/RTF for simple access

🖥️ Any IMAP Server

Direct server upload

 Use Cases

Who Benefits from PST Converter

Real-world scenarios where Univik PST Converter provides the ideal solution.

IT Departments

Migrating organizations from Outlook to open-source alternatives. Batch convert employee PST archives to MBOX for Thunderbird deployment.

Legal Professionals

Preparing email evidence for litigation. Convert PST to PDF with preserved headers for court submissions. Filter by date for targeted discovery.

Compliance Officers

Creating searchable archives for GDPR, HIPAA, SOX compliance. Convert PST to accessible formats for audit trails and retention policies.

Non-Outlook Users

Mac users, Linux users, or anyone without Outlook who needs to access PST archives. View and convert to cross-platform formats.

Personal Archival

Individuals preserving years of Outlook emails in universal formats. Convert to PDF for permanent archives that dont require email software.

Cloud Migration

Moving from on-premise Outlook to Gmail or other cloud services. Upload PST contents directly to IMAP servers without intermediate steps.

 Technical Data Sheet

Technical Specifications

Complete product specifications, system requirements, and compatibility information.

100%

VirusTotal Score: Clean  

Verified by 70+ antivirus engines. 100% safe to download and use.

  • Virus free
  • Spyware free
  • Adware free

Supported Input Files

PST Files:
Unicode PST (Outlook 2003+)
ANSI PST (Outlook 97-2002)
Password-protected PST
Large PST files (50GB+)
All Outlook versions supported.

Software Box
Product Name:Univik PST Converter
Current Version:25.1 (January 2025)
File Size:21.4 MB
License Delivery:Instant via Email
Free Trial:Free Download
100% Safe

Latest Release

Version 25.1 Features

  • Enhanced large PST handling
  • Improved Unicode support
  • Better calendar/contact export
  • Faster batch processing
  • Updated cloud upload options
Limitations
Trial Limitations:Free demo allows unlimited preview. Export limited to first 25 items per folder. Purchase license for unlimited conversion.
Requirements
Hard Disk:100 MB free (additional space for output, depends on PST size)
RAM:4 GB minimum (8 GB recommended for large PST files)
Processor:Intel Core i3 or equivalent
Platforms
Platforms:
  • Windows: 11, 10, 8.1, 8, 7 (32 and 64-bit)
  • Server: 2022, 2019, 2016, 2012
Prerequisites
Prerequisites:
  • Standalone: No additional software required
  • Outlook: NOT required - works independently
  • Offline: Works without internet after install

 Help and Support

Frequently Asked Questions

Find answers to common questions about Univik PST Converter.

Yes, absolutely! Univik PST Converter works completely independently of Microsoft Outlook. It has its own PST parsing engine that reads both Unicode and ANSI PST files directly. You can open, view, preview, and convert PST files on any Windows computer without Outlook or any Office products installed.

PST (Personal Storage Table) is a portable archive that you can open anywhere Outlook runs. OST (Offline Storage Table) is a cache file that syncs with Exchange/Microsoft 365 and becomes inaccessible if you lose server access. PST files are self-contained and dont require any server connection. Our PST Converter handles PST files; for orphaned OST files, see our OST Converter tool.

Univik PST Converter supports 15+ output formats: EML (universal email), MBOX (Thunderbird/Unix/Mac), MSG (individual Outlook messages), PDF (document archive), HTML (web viewing), RTF (rich text), TXT (plain text), EMLX (Apple Mail), MHT (web archive), plus direct upload to Gmail, Office 365, Yahoo, and any IMAP server.

Yes, 100% data preservation! All email components are fully maintained during conversion: attachments (documents, images, archives), HTML formatting, inline images, email headers, folder structure, read/unread status, timestamps, categories, flags, importance levels, and all metadata. Nothing is lost in the conversion process.

Univik PST Converter can handle PST files of any size, including large archives up to 50GB or more. The software uses optimized streaming architecture and efficient memory management to process large files without crashing or excessive RAM usage. Weve tested with files exceeding 50GB with consistent performance.

Yes! The converter supports password-protected PST files. Youll need to enter the correct password when adding the file. For PST files where youve forgotten the password, the software can often still access the content because Outlooks PST password protection is relatively weak encryption.

Yes, you have complete control! Browse the PST folder structure, check only the folders you want (Inbox, specific projects, certain date ranges), and convert just those. You can also filter by date range, sender, recipient, or keywords to export only the emails you need.

Your data is completely safe and private. Univik PST Converter is a desktop application that works 100% offline. Your PST files are never uploaded to any server. All processing happens locally on your computer. The original PST file is never modified - we only read from it.

Yes! Our advanced scanning can find soft-deleted emails that still exist in the PST files internal structures. These are items that were deleted but not permanently purged. The recovery feature can extract these hidden items and include them in your conversion output.

The free trial provides full functionality for evaluation: unlimited file loading, complete folder browsing, full email preview, all features available. Export is limited to the first 25 items per folder. Purchase a full license ($49) for unlimited conversion. Volume discounts available for enterprise deployment.

Still have questions? Contact support or Live Chat