MSG is Microsoft Outlook's native message format. Each .msg file contains a single email with all properties, attachments, and formatting. Double-click any MSG file to open it directly in Outlook.

Do I need Outlook installed to create MSG files?

No. Univik MBOX to MSG Converter creates MSG files independently without requiring Outlook installation. However, Outlook is needed to open the resulting MSG files.

What's the difference between MSG and PST?

MSG stores one email per file while PST is a container holding thousands of emails. MSG files can be managed individually like documents, while PST requires Outlook to access contents.

Are Outlook properties like categories and flags preserved?

Yes. The converter creates MSG files with full MAPI property support including sender, recipients, dates, attachments, importance flags, and read status.

MBOX to MSG Converter - Convert to Outlook Message Files

MAPI

Full property support

Native

Outlook's own format

Portable

One file per email

Direct

No import required

Why MSG Format

Benefits of Outlook MSG Files

MSG is Microsoft Outlook's native message format. Each file contains a complete email that Outlook recognizes and opens instantly.

Zero Import Process

Double-click any MSG file to open it directly in Outlook. No File → Import wizards, no PST mounting, no mailbox configuration. Instant access to email content.

Complete MAPI Properties

MSG files preserve all Outlook message properties: sender, recipients, timestamps, importance flags, categories, read/unread status and custom MAPI attributes.

Easy Email Sharing

Share individual emails as file attachments. Recipients with Outlook can open MSG files directly. No need to forward or re-send - just attach the .msg file.

Document System Integration

Store emails in SharePoint, Documentum, M-Files or any DMS. MSG files work like documents - version control, metadata, workflow and retention policies apply.

File System Organization

Organize emails in Windows folders by project, client or date. Use familiar file operations - copy, move, rename, search. Build your own folder hierarchy.

Drag-to-Outlook Import

Need to import MSG files into your mailbox? Simply drag them from File Explorer into any Outlook folder. Bulk import thousands of messages effortlessly.

Key Features

Professional MSG Conversion Features

Complete MBOX to MSG conversion with full Outlook message property support.

Full MAPI Property Mapping

Converts all email properties to their MAPI equivalents: PR_SENDER_EMAIL_ADDRESS, PR_MESSAGE_DELIVERY_TIME, PR_IMPORTANCE and dozens more. MSG files behave exactly like native Outlook messages.

Embedded Attachments

All attachments stored within the MSG file using OLE structured storage - Outlook's native attachment format. Open attachments directly from the MSG without extraction.

Flexible File Naming

Name MSG files using email properties: Subject, Date, Sender or combinations. Create organized archives like 2024-01-15_John_Smith_Project_Update.msg.

RTF Body Conversion

Converts HTML email bodies to Outlook's native RTF format for perfect rendering. Plain text and HTML alternatives also stored for maximum compatibility.

Batch Processing

Process multiple MBOX files simultaneously. Convert entire Thunderbird profiles, Apple Mail archives or Gmail Takeout exports to MSG in a single operation.

Selective Conversion

Convert only emails you need. Filter by date range, sender, recipient, subject keywords or attachment presence. Preview and hand-pick individual messages.

Step-by-Step Guide

How to Convert MBOX to MSG

Create Outlook-compatible MSG files from your MBOX archives in four simple steps.

Add MBOX Files

Click "Add Files" or drag-drop your MBOX archives from Thunderbird, Apple Mail or Gmail Takeout.

Preview & Select

Browse emails in the preview panel. Select all or filter specific emails for conversion.

Choose MSG Format

Select "MSG" as output format. Configure file naming pattern and folder structure.

Generate MSG Files

Click Convert. Each email becomes a separate MSG file ready to open in Outlook.

Format Comparison

MSG vs EML vs PST

Choose the right output format for your needs.

Feature	MSG	EML	PST
Emails per file	One	One	Unlimited
Outlook native	✓ Yes	Partial	✓ Yes
MAPI properties	✓ Full	✗ None	✓ Full
Double-click opens	✓ Outlook	Any client	✗ No
Import required	✗ No	✗ No	Mount/Import
Cross-platform	Windows	✓ Universal	Windows
Document systems	✓ Excellent	✓ Good	✗ Poor
File format	OLE/CFBF	Plain text MIME	OLE/CFBF

Choose MSG when:

Recipients use Outlook
You need full MAPI properties
Storing in document systems
Sharing individual emails

Choose EML when:

Recipients use various clients
Cross-platform compatibility needed
Desktop search indexing wanted
Smaller file size preferred

Choose PST when:

Migrating to Outlook mailbox
Importing into Exchange
Single archive file preferred
Need folder structure in Outlook

Technical Details

MSG File Structure

Understanding the Outlook MSG format and its capabilities.

OLE Compound Document

MSG files use OLE (Object Linking and Embedding) structured storage - the same binary format used by Microsoft Office documents. This ensures perfect compatibility with Outlook and MAPI-aware applications.

Internal Streams:

__properties_version1.0 - MAPI properties
__substg1.0_* - Message content
__attach_version1.0_* - Attachments
__recip_version1.0_* - Recipients

MAPI Properties Preserved

The converter maps all email headers to their MAPI property equivalents:

PR_SENDER_NAME - Sender display name
PR_SENDER_EMAIL_ADDRESS - Sender email
PR_MESSAGE_DELIVERY_TIME - Received date
PR_CLIENT_SUBMIT_TIME - Sent date
PR_SUBJECT - Email subject
PR_IMPORTANCE - Priority flag
PR_MESSAGE_FLAGS - Read/unread status
PR_BODY / PR_RTF_COMPRESSED - Body text

Compatibility

Outlook Version Support

MSG files work with all Outlook versions from 2007 onwards.

Outlook 2007

✓ Supported

Outlook 2010

✓ Supported

Outlook 2013

✓ Supported

Outlook 2016

✓ Supported

Outlook 2019

✓ Supported

Outlook 365

✓ Supported

Note on New Outlook

The new Outlook for Windows (preview) has limited MSG file support. For full MSG functionality, use classic Outlook desktop application. MSG files also work with third-party applications that support MAPI message format.

Use Cases

Who Uses MBOX to MSG Conversion

● Document Management Teams

Storing emails in SharePoint, M-Files or enterprise DMS. MSG files integrate with document workflows, metadata tagging and retention policies.

● Legal & eDiscovery

Producing email evidence in Outlook-native format. MSG files preserve complete MAPI properties for authenticity verification in legal proceedings.

● IT Administrators

Converting legacy email archives to Outlook format. MSG files can be bulk-imported into Exchange mailboxes or PST archives.

● Sales & CRM Integration

Attaching email correspondence to CRM records. MSG files store complete conversations that can be linked to contacts and opportunities.

● Project Documentation

Archiving project-related emails alongside documents. Store MSG files in project folders for complete communication history.

● Personal Archiving

Creating portable email backups that open directly in Outlook. No PST management or mailbox configuration required.

System Requirements

Product Specifications

Software Details

Product:	Univik MBOX to MSG Converter
Version:	25.3 (March 2025)
File Size:	24.5 MB
Price:	$49 (One-time)
Trial Limit:	25 emails per file
Outlook Required:	No (for conversion)

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:	Space for MSG output files
Dependencies:	None - standalone application
.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.

Questions & Answers

MBOX to MSG FAQ

MSG stores one email per file while PST is a container that can hold thousands of emails, folders, contacts and calendar items. MSG files can be managed individually like documents - double-click to open, drag to Outlook to import, attach to other emails. PST files require Outlook to mount or import before you can access individual emails inside.

No. Univik MBOX to MSG Converter creates MSG files using its own built-in engine without requiring Outlook or any MAPI libraries. However, you do need Outlook (or another MSG-compatible application) to open and view the resulting MSG files.

Yes. All attachments are embedded within the MSG file using OLE structured storage - the same format Outlook uses natively. When you open the MSG in Outlook, attachments appear exactly as they would in a regular email and can be opened, saved or forwarded.

Yes. Simply drag MSG files from File Explorer into any Outlook folder (Inbox, custom folders, etc.). Outlook will copy the messages into your mailbox. You can also open an MSG file and use Message → Move to move it into a specific folder.

The converter maps all standard email headers to their MAPI property equivalents: sender name and address, all recipients (To, CC, BCC), sent and received dates, subject, importance/priority flags, message body (plain text, HTML and RTF versions), attachments, and Message-ID. The resulting MSG files are indistinguishable from emails created natively in Outlook.

You choose the naming pattern. Options include: Subject only, Date + Subject, Sender + Subject, Date + Sender + Subject, or sequential numbers. Invalid filename characters are automatically replaced. Example: 2024-01-15_John_Smith_Project_Update.msg

Yes. The converter can recreate your MBOX folder hierarchy in the output directory. Inbox, Sent, Drafts and custom folders become Windows folders containing their respective MSG files. This maintains your organizational structure in the extracted archive.

Outlook for Mac has limited MSG support. For full cross-platform compatibility, consider EML format instead. MSG is primarily designed for Windows environments where Outlook is the standard email client.

Yes. Use filters to select emails by date range, sender, recipient, subject keywords or attachment presence. You can also manually select individual emails in the preview panel before conversion.

Yes. Univik MBOX to MSG 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, ensuring complete privacy for confidential communications.

Ready to Create Outlook MSG Files?

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

Download Free Trial Buy Full Version - $49

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

About This Tool

Univik MBOX to MSG Converter is part of our comprehensive MBOX Converter suite. Since 2013, our email conversion tools have been trusted by IT professionals, legal teams and enterprises for creating Outlook-compatible email archives.

Our MSG output uses proper OLE compound document format with full MAPI property mapping, ensuring perfect compatibility with all Outlook versions. All tools are digitally signed and verified clean by VirusTotal.

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