Corbett

EML to MBOX Converter

Corbett EML to MBOX Converter opens EML files on Windows and saves every folder as an MBOX file, in bulk or for chosen folders only. Folders, attachments and dates stay intact, and mail client does not need to be installed. Try free demo first.

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4.6 out of 5 from 683 reviews

Works offline on your PC. Corbett never sees your EML files or messages.

Free demo, scanned clean on VirusTotal and a 30-day money-back window.

Lifetime licence from $99 Demo converts 10 emails per folder

Quick answer

What Is a EML to MBOX Converter?

An EML to MBOX converter opens EML files and saves every folder as an MBOX file. Corbett EML to MBOX Converter does that offline on Windows, so your mail opens in Thunderbird, Apple Mail and any client that imports MBOX.

What it opens

Single EML files, Folders of EML files, Thousands of messages in one batch

What it saves

MBOX first, plus EML, PDF, HTML, TXT

Who uses it

Thunderbird and Apple Mail users and admins moving or archiving mail

Conversion scope

EML to MBOX Converter for Eml mail on Windows

EML to MBOX Converter Saves Every folder as an MBOX file

An EML file holds one email message. MBOX files import into Thunderbird and Apple Mail. EML to MBOX converter reads EML files on Windows and saves every folder as an MBOX file, with your EML files left as they were.

Kept in output

Email body and headers
Attachments
Sender and receiver
Dates and subjects
Folder tree

EML input types

Single EML files
Folders of EML files
Thousands of messages in one batch
Files from Thunderbird and Apple Mail

Outputs

MBOX
EML
PDF
HTML
TXT
CSV
Gmail
Office 365
IMAP

Not needed

mail client install
Internet connection
Mailbox password
Extra software

EML holds one message and MBOX holds many

The Library of Congress EML format page describes EML as one message per file, while RFC 4155 defines MBOX as many messages in one file. The Mozilla Thunderbird Maildir page calls MBOX the traditional Thunderbird format. EML to MBOX converter gathers loose EML files into MBOX files and leaves your EML files as they were.

Open MBOX file

Related pages: EML Converter, MBOX Converter, EML to PST Converter, MBOX to EML Converter and PST to MBOX Converter. Other mail files sit on email converter tool page.

Core features

EML to MBOX Converter Features by Screen

Five screens of Corbett EML to MBOX converter software, in conversion order.

EML to MBOX converter email data files list

Source files

Add Your EML Files

Select Open, then Email Data Files, and add your EML files. EML to MBOX converter loads your mail into its panel, and no mail client is needed.

A spare PC with no mail client still works. EML to MBOX converter reads your files and leaves them as they were.

Batch loading

Choose Files or Choose Folders

Select Choose Files for one EML file or a few. Select Choose Folders to load an entire directory of EML files in one step.

Loaded mail appears in one tree with a checkbox beside every item, so EML to MBOX converter handles many EML files in a single session. No file size limit applies.

EML to MBOX converter email preview with content, header, properties, hex and raw views

Message preview

Preview EML Mail Before Converting

Click any message and a reading pane opens beside five analysis views. Use them to confirm correct mail before EML to MBOX conversion starts.

Content shows the email body. Message header lists From, To, Subject and Date. Properties reports item data, while hex and raw message views show the stored mail.

EML to MBOX converter export menu with email file and document formats

Output formats

Select MBOX as Your Output Format

Select MBOX under Email Files in the Export menu. The same load also exports EML, PDF, HTML and more, and the menu lists Gmail, Office 365, IMAP and Thunderbird for sending mail into an account.

Search by keyword first, then save only matched items. Quick search highlights hits in yellow, and Advance search checks every field or only name, subject, To, Cc and content.

Export options

Set MBOX Export Options Before You Save

Switch on open folder after export, skip greyed out folders, create empty folders and include email headers. Every folder converts to its own MBOX file, so your tree stays in order.

Select Browse to choose a destination, then Save. Live progress shows every folder as it converts, and Open Folder takes you to your MBOX output.

Working process

How to Convert EML to MBOX in Four Steps

Four steps take your EML files to MBOX. Try them on a few files in free demo first.

Add your EML files

Start EML to MBOX converter, select Open, then Email Data Files and add your EML files. Select Choose Files for one file or Choose Folders for many.

Preview and select mail

Your EML folders load as one tree. Click any email to preview it, tick what you need and search by keyword to trim your EML to MBOX conversion.

Choose MBOX output

Select Export, then MBOX under Email Files. EML, PDF, HTML, TXT, CSV sit in the same menu for other jobs.

Save your MBOX output

Set options, select Browse for a folder and press Save. Live progress shows every folder, and Open Folder takes you to your MBOX output.

Moving the result into a client is covered in Import MBOX to Thunderbird account and Import MBOX to Outlook account.

Working process

EML to MBOX Converter Video Walkthrough

Prefer text? Open Import MBOX to Thunderbird account for the next move with your finished MBOX output.

Advanced options

More EML to MBOX Converter Features for Big Jobs

Small options that save hours when you convert EML files in bulk with EML to MBOX converter.

Bulk EML input

Many EML files convert in one session

Folder hierarchy

MBOX output follows your EML tree

No file size limit

Any EML size and mail count converts

Five preview views

Content, header, properties, hex and raw message

Advance search

Name, subject, To, From and content fields

Quick search

Yellow hit highlights in the preview

Chosen items

Convert contacts, addresses or attachments only

Attachment extraction

Save attachments alone, any size

Email address extraction

Save addresses to their own file

Empty folders option

Keep the full tree, even with no mail

Cloud upload

Send mail to Gmail, Office 365 or IMAP

USB and NAS targets

Save output to external drives and network storage

Output formats

EML to MBOX Converter Output Formats

EML to MBOX converter saves mail as MBOX, and the same load exports more targets. Match your format to where your mail will open.

MBOX

One file per folder for Thunderbird and Apple Mail

EML

One file for every message

PST

A fresh Outlook file

PDF

Readable pages for filing and records

HTML

Messages that open in any browser

TXT and CSV

Plain text and sheets of mail details

Gmail, Office 365 and IMAP

Mail lands in the target mailbox

Any drive

Local, USB and network folders

Free demo

Test EML to MBOX Converter on a Real EML File

Install free demo, load a EML file and choose MBOX. Free demo converts 10 emails per folder, so your output is quick to check.

Download free demo

Try before you buy

Free Demo vs Full EML to MBOX Converter

Free demo of EML to MBOX converter opens, previews and searches your full EML file. Only conversion is capped.

Feature	Free demo	Full version
Open EML files and folders	Yes	Yes
Preview and search	All available	All available
Emails converted per folder	10	Unlimited
EML size and mail count	Conversion stops at 10 per folder	No limit
Price	Free	From $99 one time

Use cases

Who Needs a EML to MBOX Converter?

Anyone who holds EML mail that will not open where needed.

Thunderbird and Apple Mail users switching programs

EML to MBOX converter saves mail as MBOX files that Thunderbird and Apple Mail import, so your mail opens in Thunderbird, Apple Mail and any client that imports MBOX.

IT admins

Convert a folder of EML files to MBOX in one batch and hand every user a ready tree.

Legal and compliance teams

Save mail with headers and attachments intact for review and discovery.

Archive keepers

Convert EML files that only one program opens into MBOX that more programs read.

Anyone with piles of EML files

Convert thousands of loose messages into files you can search and save it as MBOX.

Selective exporters

Search by sender or subject and save only the matching emails.

Why Corbett

Why Choose Corbett EML to MBOX Converter?

No subscription

Lifetime price from $99

Works offline

No sign-in and no upload

Originals stay safe

EML files open read only

envelope-fill

No mail client needed

No size limit

Any EML size and mail count

Folders kept

Folders and subfolders stay in order

Smart search

Name, subject, To, From and content

30-day refund

Money-back window after purchase

Before conversion

EML to MBOX Converter Scope and Limits

EML to MBOX converter converts EML files into MBOX. Here is what that covers and where it stops.

Capability	Supported	What it means
File to file conversion	Yes	EML to MBOX, EML, PDF, HTML, TXT, CSV and more
Folder tree	Kept	MBOX output follows your EML folders
mail client installed	Not needed	Files open on a PC with no mail client
Source EML files	Read only	Output goes to a new folder and your originals stay as they were
Internet and passwords	Not needed	Conversion works offline on local files
Calendars, tasks and notes	Check output	Mail is the focus, so other item types may stay in the source file
Mac and Linux	No	EML to MBOX converter installs on Windows only

Manual route or tool

EML to MBOX Converter vs Manual Route

Here is where the manual route stops, and where EML to MBOX converter takes over.

Job	Manual route	EML to MBOX Converter
Cost	Free	From $99 one time
One email	Open and save by hand	Works too
MBOX file output	Not offered in Outlook	Folder mail in one file
Many EML files	Slow and error prone	Folders of EML files in one session
Folder tree	Often reshuffled	Same as the source
Search before export	Basic search only	Name, subject, To, From and content
mail client installed	Often required	Not needed

Global recognition

EML to MBOX Converter Software Users Trust

Users rate Corbett EML to MBOX converter 4.6 out of 5 from 683 reviews, and these software directories list it.

CNET
Download.io
UpdateStar
TopSoftware Advisor
SaaSHub
Uptodown

Specifications

EML to MBOX Converter Specifications

Download details

Download size: 87.4 MB
Demo limit: 10 items per folder
Delivery: After payment, mail arrives with a download link and a licence key.
Licence: Personal: 5 machines. Business: 25 machines. Enterprise: 100 machines. Lifetime validity.

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System

Hard disk: 150 MB of free space
RAM: 4 GB of memory minimum
Processor: 1 GHz Intel Pentium minimum and 2.4 GHz advised
Interface: English
Input: EML files

Supported editions

Windows 11 (64 bit), 10, 8 and 7 in 32-bit or 64-bit, plus Windows Server 2016, 2012 R2 and 2008.

Start EML to MBOX converter with administrator rights.

Corbett has built Windows email utilities since 2020. Setup trouble and first-use questions go to our support desk.

User testimonials

EML to MBOX Converter Reviews

EML to MBOX converter shares 683 reviews on software index sites and customer feedback.

4.6 out of 5

Collected across 683 reviews from software indexes and customer feedback. Three reviews below are unedited.

Quick conversion

I wanted to convert my EML files into MBOX format as quickly as possible. Upon suggestion of a colleague I decide to give this EML to MBOX conversion tool a try. I think the application works really well, and I’m satisfied with it.

James Collins

No hassles

This EML to MBOX converter software is a great application for converting your EML files withthout any hassles. I had to convert multiple EML files into MBOX format. Upon the suggestion of my colleague, and suffice it say, I'm happy with the software.

Christian Pjnaic

Fast and simple

I give this application a rating of full stars. What I liked most about this software was its fast conversion rate and the simple interface. I really didn't face any trouble with using the tool anywhere, even though I know barely know anything about IT. I am lucky that I buy EML to MBOX converter full version.

Quina Frew

Before conversion

Prepare Your EML Files for MBOX Conversion

Three short checks keep your EML to MBOX conversion clean.

Make a EML copy

Back up your EML files on a safe drive before you start. EML to MBOX converter opens files read only, and a spare copy keeps the original safe.

Choose all mail or chosen items

Convert every folder at once, or limit the job to the folders and items you need.

Leave space for output

MBOX files hold many emails apiece, so a large mailbox needs a destination disk with free room.

Need the EML files in Outlook instead? Read Import EML files to Outlook.

Best practice

How to Keep Your EML to MBOX Conversion Safe

A conversion only helps if your mail arrives complete. Four habits keep your data safe through it.

Back up first

Copy your original EML files before you start. Keep 3 copies on 2 types of media with 1 copy off site.

Start with one file

Convert one small EML file with EML to MBOX converter and open a few emails in MBOX. Catch a wrong setting before a large job.

Check the count

Compare the message count in the folder tree with the mail in your output before you close the job.

Keep originals until checked

Store your source EML files until counts match. Delete them only after you open converted mail.

Common questions

EML to MBOX Converter FAQs

EML to MBOX converter steps, formats, limits and licence answers.

What is an EML to MBOX converter?

An EML to MBOX converter opens EML files and saves every folder as an MBOX file. Corbett EML to MBOX Converter does that offline on Windows, so EML file converter needs no mail client.

How do I convert EML to MBOX?

Open EML to MBOX converter, select Open, then Email Data Files and add your EML file. Preview your mail, select Export, then MBOX under Email Files and press Save.

Can EML to MBOX converter gather thousands of EML files into MBOX?

Yes. Select Choose Folders, load the directory and EML to MBOX converter saves the messages as MBOX files in one session.

Can I import EML files into Thunderbird as MBOX?

Yes. Convert the EML files with EML to MBOX converter, then import the MBOX files into Thunderbird or Apple Mail.

Can EML to MBOX converter save EML mail as PST instead?

Yes. PST and EML sit under Email Files in the same Export menu, next to MBOX.

Can EML to MBOX converter save attachments only?

Yes. A separate option saves attachments alone, with a file extension filter for specific types.

Does EML to MBOX converter keep email headers?

Yes. Headers stay with every message, and the Include email headers option adds them to the output.

Does EML to MBOX converter need Thunderbird or Apple Mail?

No. It reads EML files on its own, so conversion works on a PC with no mail client. Install Thunderbird or Apple Mail only to import the MBOX files.

Can EML to MBOX converter convert many EML files at once?

Yes. Select Choose Folders and load a directory of EML files, then EML to MBOX converter converts every file in one session.

Does EML to MBOX converter keep my folder tree?

Yes. MBOX output follows the order of your source folders, and the Create empty folders option keeps folders that hold no mail.

Does EML to MBOX converter keep attachments?

Yes. Attachments stay with every message, and a separate option saves attachments alone with a file extension filter for specific types.

Can EML to MBOX converter convert only some emails?

Yes. Advance search filters by name, subject, To, From and content, and EML to MBOX converter converts only matching mail.

Can EML to MBOX converter preview mail first?

Yes. Click any message and five views open: content, message header, properties, hex and raw message.

Can EML to MBOX converter send mail straight to Gmail or Office 365?

Yes. Gmail, Office 365 and IMAP sit in the Export menu. Sign in to the target account and the mail lands there.

Does EML to MBOX converter have a size limit?

No. EML to MBOX converter sets no size cap, and batch mode takes many files at once. Keep free disk space for your output.

Does EML to MBOX converter need mail client?

No. EML to MBOX converter reads EML files on its own, so it works on a PC without mail client.

Will EML to MBOX converter change my EML file?

No. EML to MBOX converter opens your files read only, and output goes to a new folder.

Does my EML data pass through Corbett?

No. Conversion happens on your PC with no upload. Corbett never sees your EML files or messages.

Does EML to MBOX converter work on a Mac?

No. EML to MBOX converter installs on Windows only. Copy your EML files to a Windows PC and convert them there.

How many emails can free demo convert?

Free demo of EML to MBOX converter opens your files, shows every folder and gives you every search and preview. Conversion stops at 10 emails per folder, enough to test your output before you buy.

Which Windows versions work?

Windows 11 (64 bit), 10, 8 and 7, plus Windows Server 2016, 2012 R2 and 2008. There is no macOS or Linux build.

How many PCs does one licence cover?

Personal licence covers 5 machines for $99, Business covers 25 for $299 and Enterprise covers 100 for $499. All three are one time payments with lifetime validity, 24/7 support and a 30 day refund.

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