Will my folder structure be preserved in the PST file?

Yes. The converter maintains your complete folder hierarchy including Inbox, Sent, Drafts and all custom folders. Subfolders and nested structures appear exactly as in the original MBOX.

What is the maximum PST file size supported?

You can create PST files up to the Outlook limit (50GB for Outlook 2010+). The converter also supports automatic splitting into multiple PST files if needed.

How do I import the converted PST into Outlook?

In Outlook, go to File > Open & Export > Import/Export > Import from another program or file > Outlook Data File (.pst). Browse to your converted PST and select import options.

MBOX to PST Converter

Excellent 4.9 TrustRating (312 Verified Reviews)

Convert MBOX to Outlook PST

Migrate your emails from Thunderbird, Apple Mail or Gmail Takeout directly into Microsoft Outlook. The converter creates industry-standard PST files that import seamlessly into Outlook 2021, 2019, 2016, 2013 and Microsoft 365 - no Outlook installation required during conversion.

Free Download
100% Safe & Secure

Buy Now - $49

*Free trial converts first 25 emails per file. Full version for unlimited conversion.

Migration Path

MBOX
Thunderbird
Apple Mail
Gmail

PST
Outlook 2021
Outlook 365
Outlook 2019

✓ Folder structure preserved
✓ All attachments included
✓ Email headers intact
✓ No Outlook required for conversion

Unicode PST

Full international character support

Up to 50GB

Per PST file (Outlook 2010+ limit)

Auto-Split

Create multiple PSTs if needed

Direct Import

File > Import in Outlook

Why Convert to PST

Benefits of Outlook PST Format

PST (Personal Storage Table) is the standard format for Microsoft Outlook data. Converting to PST gives you access to powerful email management features.

Corporate Standard

Microsoft Outlook is the dominant email client in business environments. PST format integrates with Exchange Server, SharePoint and Microsoft 365 ecosystems.

Advanced Search

Outlook's search indexes PST contents for instant results. Find emails by sender, date, attachment name, keywords or custom categories.

Calendar & Contacts

PST files can store not just emails but calendar events, contacts, tasks and notes - all accessible within Outlook's unified interface.

Long-Term Archive

PST is a proven archival format supported since Outlook 97. Your emails remain accessible decades from now with any Outlook version.

Legal Discovery

PST format is widely accepted in legal proceedings. eDiscovery tools and litigation support platforms natively process PST files.

Portable Storage

PST files are self-contained and can be moved between computers, stored on external drives or backed up to cloud storage.

Key Features

Powerful Conversion Features

Professional-grade MBOX to PST conversion with features designed for reliable Outlook migration.

Batch MBOX Processing

Convert multiple MBOX files to a single PST or separate PST files in one operation. Process entire Thunderbird profiles or Gmail Takeout archives containing thousands of emails efficiently.

Folder Structure Preservation

Your Inbox, Sent, Drafts, Trash and custom folders appear exactly the same in Outlook. Nested subfolders and folder hierarchy maintained to any depth during PST creation.

Complete Attachment Transfer

All email attachments embedded in the PST file exactly as in original MBOX. Documents, images, PDFs and archives open directly from Outlook after import with original filenames.

Email Header Integrity

All metadata preserved: From, To, CC, BCC, Date, Subject, Message-ID, routing headers and X-headers. Emails appear in Outlook sorted by original dates, not conversion date.

Smart PST Splitting

Automatically split large archives into multiple PST files by size (5GB, 10GB) or by folder. Keeps PST files within Outlook's optimal performance range for faster access.

Selective Email Migration

Filter emails by date range, sender, recipient or keywords before conversion. Migrate only specific folders or time periods. Exclude spam and trash from your PST.

No Outlook Required

Creates PST files independently without Microsoft Outlook installation. Convert on any Windows machine, then transfer PST to the target computer with Outlook for import.

Full Unicode Support

Perfect handling of international characters: Chinese, Japanese, Korean, Arabic, Hebrew, Cyrillic and European languages. Creates Unicode PST compatible with Outlook 2003+.

Step-by-Step Guide

How to Convert MBOX to PST

Complete your migration in four simple steps. No technical expertise required.

Add MBOX Files

Click "Add Files" or drag-drop MBOX files from Thunderbird profile, Apple Mail export or Gmail Takeout archive.

Select PST Output

Choose "PST - Outlook Data File" from the export format dropdown. Configure Unicode format and size options.

Click Convert

Set destination folder and click Convert. Progress bar shows status. PST file created when complete.

Import to Outlook

In Outlook: File → Open & Export → Import/Export → Import from Outlook Data File (.pst).

PST Settings

PST Configuration Options

Fine-tune your PST output with these professional settings.

PST Format Options

Unicode PST	Outlook 2003+ format with full international character support. Recommended for all new conversions.
ANSI PST	Legacy format for Outlook 2002 and earlier. 2GB size limit. Use only if required for compatibility.
Password Protection	Optionally set a password on the generated PST file to restrict unauthorized access.

Size & Split Options

Single PST	All emails combined into one PST file. Best for smaller archives under 10GB.
Split by Size	Automatically create multiple PST files when exceeding specified size (e.g., 5GB, 10GB).
Split by Folder	Create separate PST files for each top-level folder (Inbox.pst, Sent.pst, etc.).

PST Size Recommendations

Outlook 2003-2007: Max 20GB per PST

Outlook 2010-2016: Max 50GB per PST

Outlook 2019/365: Max 50GB (configurable)

For optimal performance, Microsoft recommends keeping PST files under 10GB. The converter can automatically split larger archives.

Source-Specific Guides

Locate Your MBOX Files

Find MBOX files from your specific email client to convert to Outlook PST.

Mozilla Thunderbird

Windows Location:

%APPDATA%\Thunderbird\Profiles\[profile]\Mail\Local Folders\

Files to Convert:

Files without extension (Inbox, Sent, Drafts)
Custom folder names you created
Located inside "Mail" or "ImapMail" directories

Apple Mail (macOS)

Mac Location:

~/Library/Mail/V[x]/Mailboxes/

Export Steps:

Select mailbox in Apple Mail
Mailbox → Export Mailbox
Copy .mbox folder to Windows
Add to converter

Google Takeout

Export from Google:

Go to takeout.google.com
Select "Mail" and click Export
Download the ZIP archive
Extract to find .mbox file

File: All mail Including Spam and Trash.mbox

Outlook Import

Import PST into Microsoft Outlook

After conversion, follow these steps to import your emails into Outlook.

Open Outlook and go to File menu.
Click Open & Export → Import/Export.
Select "Import from another program or file" and click Next.
Choose "Outlook Data File (.pst)" and click Next.
Click Browse and select the PST file created by the converter.
Choose import options:
- Replace duplicates: Overwrite existing items
- Allow duplicates: Keep both versions
- Do not import duplicates: Skip existing items
Select destination folder (usually your main mailbox) and click Finish.
Wait for import to complete. Your emails appear in Outlook immediately.

Alternative: Open Without Import

Instead of importing, you can open the PST as an additional data file: File → Open & Export → Open Outlook Data File. This keeps emails separate from your main mailbox while still being fully searchable.

Supported Sources

Migrate to Outlook from Any MBOX Client

Convert emails from 20+ email applications that use MBOX format to Outlook PST.

Thunderbird

Apple Mail

Gmail Takeout

Eudora

Opera Mail

SeaMonkey

Entourage

PocoMail

Also supports: Postbox, Claws Mail, Evolution, The Bat!, Mulberry, Spicebird, KMail, Alpine, Netscape Mail, Google Vault and more.

Technical Details

Product Specifications

Software Details

Product:	Univik MBOX to PST Converter
Version:	25.3 (March 2025)
File Size:	24.5 MB
Price:	$49 (One-time)
Trial Limit:	25 emails per file
Delivery:	Instant download

System Requirements

OS:	Windows 11, 10, 8.1, 7 (32/64-bit)
Server:	Windows Server 2022, 2019, 2016
RAM:	4 GB minimum (8 GB recommended)
Disk:	100 MB + space for PST output
Outlook:	Not required for conversion
.NET:	Framework 4.7.2 or higher

100% Safe & Secure Download

Verified clean by 70+ antivirus engines. No malware, spyware or adware. Digitally signed installer.

Use Cases

Who Uses MBOX to PST Conversion

● IT Administrators

Migrating corporate email infrastructure from Thunderbird or legacy clients to Microsoft 365 / Exchange. Batch processing handles hundreds of user mailboxes efficiently.

● Legal & Compliance Teams

Converting email archives to PST for eDiscovery platforms and litigation support. PST format is standard in legal proceedings with tools like Relativity and Concordance.

● Mac to Windows Switchers

Users moving from Apple Mail on macOS to Outlook on Windows. Export MBOX from Mail.app, convert to PST on Windows, import into Outlook seamlessly.

● Gmail Archivists

Users creating local Outlook backups of Gmail accounts. Download via Google Takeout (MBOX format), convert to PST for offline access in Outlook.

● Forensic Investigators

Digital forensics professionals analyzing email evidence. PST files integrate with forensic tools like EnCase, FTK and X-Ways for evidence examination.

● Small Business Owners

Consolidating years of email from multiple free email clients into a single Outlook archive. Centralized email management with Outlook's powerful search and organization.

Comparison

Desktop vs Online Converters

Why desktop software is safer for MBOX to PST conversion.

Feature	Univik Desktop	Online Converters
Email Privacy	✓ 100% offline - emails never uploaded	✗ Emails uploaded to third-party servers
File Size Limit	✓ Unlimited - handles 10GB+ archives	✗ Usually limited to 50-100 MB
Conversion Speed	✓ Fast - local processing	✗ Slow - depends on upload/download
Batch Processing	✓ Convert multiple MBOX files at once	✗ Usually one file at a time
PST Splitting	✓ Auto-split by size or folder	✗ Rarely available
Folder Structure	✓ Complete hierarchy preserved	✗ Often flattened or lost
Attachments	✓ All attachments preserved	✗ May strip or corrupt attachments
GDPR Compliance	✓ Data stays on your computer	✗ Data transferred to unknown servers

Troubleshooting

Common Issues & Solutions

PST file won't import into Outlook

Cause: PST file may be too large or Outlook version incompatible.

Solution: Use the auto-split feature to create smaller PST files (under 10GB). Ensure you're using Unicode PST format for Outlook 2003+.

Emails show wrong dates after import

Cause: Timezone handling or corrupted date headers in source MBOX.

Solution: The converter preserves original timestamps. Check if source MBOX had date issues. Sort by "Received" date in Outlook.

Attachments missing in converted PST

Cause: Large attachments or corrupted MIME encoding in source.

Solution: Check if attachments exist in source MBOX using preview. Enable recovery mode for corrupted files.

Conversion process is very slow

Cause: Large MBOX files (10GB+) or limited system resources.

Solution: Close other applications, ensure 8GB+ RAM available. Consider splitting large MBOX files before conversion.

Special characters display incorrectly

Cause: Character encoding issues in source emails.

Solution: The converter supports Unicode and common encodings. Ensure Unicode PST format is selected for best compatibility.

Outlook reports PST file is corrupted

Cause: Incomplete conversion or file system issues.

Solution: Re-run conversion with source MBOX. Use Outlook's built-in SCANPST.exe repair tool on the output PST file.

Still having issues? Contact our support team for personalized assistance.

Questions & Answers

MBOX to PST FAQ

Yes. Univik MBOX to PST Converter creates PST files independently without requiring Microsoft Outlook installation on the conversion machine. The generated PST file can then be transferred to any computer with Outlook for import. This is particularly useful for IT administrators converting files on a server before distributing to end users.

Yes. The converter maintains your complete folder hierarchy. Inbox, Sent Items, Drafts, Trash and all custom folders you created in Thunderbird or Apple Mail appear exactly the same way in Outlook after import. Nested subfolders are also preserved to any depth.

All attachments are fully preserved and embedded in the PST file exactly as they appeared in the original MBOX. Documents, images, PDFs, spreadsheets and any other file types remain attached to their respective emails and can be opened directly from Outlook after import.

Yes. The converter handles MBOX files of any size. For very large archives, we recommend using the auto-split feature to create multiple PST files (e.g., 5GB each) for better Outlook performance. The conversion uses efficient memory management and can process files larger than available RAM.

Yes. All email metadata is preserved with forensic accuracy: sent/received dates and times, sender and recipient addresses, CC/BCC fields, subject lines, message IDs, and routing headers. Emails appear in Outlook sorted correctly by their original dates, not the conversion date.

The converter creates Unicode PST files compatible with Outlook 2003 and all later versions including Outlook 2007, 2010, 2013, 2016, 2019, 2021 and Microsoft 365. For legacy Outlook 2002/XP, you can optionally create ANSI format PST files (with 2GB size limit).

Yes. The converter includes filtering options to select emails by date range, sender, recipient, subject keywords or attachment presence. You can also use the preview panel to manually select specific emails before conversion. This is useful for creating focused archives or excluding spam.

Yes. Univik MBOX to PST Converter is 100% desktop software that works completely offline. Your emails are never uploaded to any server or cloud service. All processing happens locally on your computer. This is essential for confidential business emails, legal documents or any sensitive communications.

Yes. Add multiple MBOX files or entire Thunderbird/Apple Mail profile folders. The converter can either combine all emails into a single PST file (maintaining folder structure from each source) or create separate PST files for each MBOX source - your choice based on how you want to organize the output.

The converter includes a recovery mode that can extract readable emails from partially corrupted MBOX files. It handles common issues like truncated messages, encoding errors and malformed MIME boundaries. Recovered emails are clearly marked and the conversion report shows which messages could not be recovered.

Ready to Migrate to Outlook?

Download the free trial and convert up to 25 emails per file. Full version for unlimited migration.

Download Free Trial Buy Full Version - $49

Windows 11, 10, 8.1, 7 | No Outlook required for conversion

About This Tool

Univik MBOX to PST Converter is developed by the same team behind our MBOX Converter (15+ formats) and MBOX Viewer. Since 2013, we have helped over 50,000 users migrate emails from Thunderbird, Apple Mail, Gmail and other MBOX-based clients to Microsoft Outlook.

Our email migration tools are used by IT departments at law firms, financial institutions, healthcare organizations and government agencies where data integrity and security are paramount. All software is digitally signed and verified clean by VirusTotal.

Certified clean by 70+ antivirus engines