Corbett
Corbett MBOX to EML Converter opens MBOX files on Windows and saves every email as its own EML 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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Works offline on your PC. Corbett never sees your MBOX 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
An MBOX to EML converter opens MBOX files and saves every email as its own EML file. Corbett MBOX to EML Converter does that offline on Windows, so your mail opens in Thunderbird, Apple Mail and any client that reads EML.
What it opens
Single MBOX files, Folders of MBOX files, Exports from Thunderbird and Apple Mail
What it saves
EML first, plus MBOX, PDF, HTML, TXT
Who uses it
Thunderbird and Apple Mail users and admins moving or archiving mail
Conversion scope
An MBOX file packs many emails into one file. EML files open in Thunderbird, Apple Mail and many other clients. MBOX to EML converter reads MBOX files on Windows and saves every email as its own EML file, with your MBOX files left as they were.
Kept in output
5MBOX input types
4Outputs
9Not needed
4MBOX holds many messages and EML holds one
RFC 4155 defines MBOX as many messages in one file, and the Mozilla Thunderbird Maildir page calls it the traditional Thunderbird format. The Library of Congress EML format page describes EML as one message per file. MBOX to EML converter splits an MBOX into single EML files and leaves your MBOX as it was.
Related pages: MBOX Converter, EML Converter, MBOX to PDF Converter, MBOX to PST Converter and EML to MBOX Converter. Other mail files sit on email converter tool page.
Core features
Five screens of Corbett MBOX to EML converter software, in conversion order.
Source files
Select Open, then Email Data Files, and add your MBOX files. MBOX to EML converter loads your mail into its panel, and no mail client is needed.
A spare PC with no mail client still works. MBOX to EML converter reads your files and leaves them as they were.
Batch loading
Select Choose Files for one MBOX file or a few. Select Choose Folders to load an entire directory of MBOX files in one step.
Loaded mail appears in one tree with a checkbox beside every item, so MBOX to EML converter handles many MBOX files in a single session. No file size limit applies.
Message preview
Click any message and a reading pane opens beside five analysis views. Use them to confirm correct mail before MBOX to EML 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.
Output formats
Select EML under Email Files in the Export menu. The same load also exports MBOX, 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
Switch on open folder after export, skip greyed out folders, create empty folders and include email headers. Every folder converts to a matching folder of EML files, 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 EML output.
Working process
Four steps take your MBOX files to EML. Try them on a few files in free demo first.
Add your MBOX files
Start MBOX to EML converter, select Open, then Email Data Files and add your MBOX files. Select Choose Files for one file or Choose Folders for many.
Preview and select mail
Your MBOX folders load as one tree. Click any email to preview it, tick what you need and search by keyword to trim your MBOX to EML conversion.
Choose EML output
Select Export, then EML under Email Files. MBOX, PDF, HTML, TXT, CSV sit in the same menu for other jobs.
Save your EML output
Set options, select Browse for a folder and press Save. Live progress shows every folder, and Open Folder takes you to your EML output.
Moving the result into a client is covered in Import EML files to Outlook and Import EML to Thunderbird account.
Working process
Prefer text? Open Import EML files to Outlook for the next move with your finished EML output.
Advanced options
Small options that save hours when you convert MBOX files in bulk with MBOX to EML converter.
Bulk MBOX input
Many MBOX files convert in one session
Folder hierarchy
EML output follows your MBOX tree
No file size limit
Any MBOX 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
MBOX to EML converter saves mail as EML, and the same load exports more targets. Match your format to where your mail will open.
EML
One file for every message
MBOX
One file per folder for Thunderbird and Apple Mail
PST
A fresh Outlook file
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 MBOX to EML Converter on a Real MBOX File
Install free demo, load a MBOX file and choose EML. Free demo converts 10 emails per folder, so your output is quick to check.
Download free demoTry before you buy
Free demo of MBOX to EML converter opens, previews and searches your full MBOX file. Only conversion is capped.
| Feature | Free demo | Full version |
|---|---|---|
| Open MBOX files and folders | Yes | Yes |
| Preview and search | All available | All available |
| Emails converted per folder | 10 | Unlimited |
| MBOX size and mail count | Conversion stops at 10 per folder | No limit |
| Price | Free | From $99 one time |
Use cases
Anyone who holds MBOX mail that will not open where needed.
Thunderbird and Apple Mail users switching programs
MBOX to EML converter saves mail as EML files that Thunderbird and Apple Mail import, so your mail opens in Thunderbird, Apple Mail and any client that reads EML.
IT admins
Convert a folder of MBOX files to EML 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 MBOX files that only one program opens into EML that more programs read.
Anyone with large MBOX files
Open a big MBOX that is slow to read and save it as EML.
Selective exporters
Search by sender or subject and save only the matching emails.
Why Corbett
No subscription
Lifetime price from $99
Works offline
No sign-in and no upload
Originals stay safe
MBOX files open read only
envelope-fill
No mail client needed
No size limit
Any MBOX 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
MBOX to EML converter converts MBOX files into EML. Here is what that covers and where it stops.
| Capability | Supported | What it means |
|---|---|---|
| File to file conversion | Yes | MBOX to EML, MBOX, PDF, HTML, TXT, CSV and more |
| Folder tree | Kept | EML output follows your MBOX folders |
| mail client installed | Not needed | Files open on a PC with no mail client |
| Source MBOX 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 | MBOX to EML converter installs on Windows only |
Manual route or tool
Here is where the manual route stops, and where MBOX to EML converter takes over.
| Job | Manual route | MBOX to EML Converter |
|---|---|---|
| Cost | Free | From $99 one time |
| One email | Open and save by hand | Works too |
| EML file output | Not offered in Outlook | One EML per email |
| Many MBOX files | Slow and error prone | Folders of MBOX 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
Users rate Corbett MBOX to EML converter 4.6 out of 5 from 683 reviews, and these software directories list it.
CNET
Download.io
UpdateStar
TopSoftware Advisor
SaaSHub
Uptodown
Specifications
Download details
System
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 MBOX to EML 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
MBOX to EML converter shares 683 reviews on software index sites and customer feedback.
Collected across 683 reviews from software indexes and customer feedback. Three reviews below are unedited.
With this MBOX to EML Converter tool tool by Corbett Software, I easily managed to convert and move my Thunderbird MBOX files to EML. I would recommend this application to anyone who is looking for an MBOX file to EML conversion tool.
I wanted to keep my Opera email files in my Outlook account. After sifting through multiple solutions available online, I decided to go with this MBOX to EML conversion tool. Obviously, I'm happy with my purchase. Recommend this app to everyone.
I wanted to shift my email account to Outlook from Thunderbird. But for that, I had to first convert my Thunderbird mail to EML format. I used this MBOX to EML converter tool by CorbettSoftware for this. Amazing software!
Before conversion
Three short checks keep your MBOX to EML conversion clean.
Make a MBOX copy
Back up your MBOX files on a safe drive before you start. MBOX to EML 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
Every email becomes its own EML file, so thousands of messages need a destination disk with free room.
Need other ways to open an MBOX? Read Open MBOX file.
Best practice
A conversion only helps if your mail arrives complete. Four habits keep your data safe through it.
Back up first
Copy your original MBOX files before you start. Keep 3 copies on 2 types of media with 1 copy off site.
Start with one file
Convert one small MBOX file with MBOX to EML converter and open a few emails in EML. 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 MBOX files until counts match. Delete them only after you open converted mail.
Common questions
MBOX to EML converter steps, formats, limits and licence answers.
An MBOX to EML converter opens MBOX files and saves every email as its own EML file. Corbett MBOX to EML Converter does that offline on Windows, so MBOX file converter needs no mail client.
Open MBOX to EML converter, select Open, then Email Data Files and add your MBOX file. Preview your mail, select Export, then EML under Email Files and press Save.
Yes. Load the MBOX and MBOX to EML converter saves every message as its own EML file, with no file size limit.
Yes. Convert the MBOX with MBOX to EML converter, then import the EML files into Outlook.
Yes. PST and EML sit under Email Files in the same Export menu.
Yes. A separate option saves attachments alone, with a file extension filter for specific types.
Yes. Headers stay with every EML file, and the Include email headers option adds them to the output.
No. It reads MBOX files on its own, so conversion works on a PC with no mail client.
Yes. Select Choose Folders and load a directory of MBOX files, then MBOX to EML converter converts every file in one session.
Yes. EML output follows the order of your source folders, and the Create empty folders option keeps folders that hold no mail.
Yes. Attachments stay with every message, and a separate option saves attachments alone with a file extension filter for specific types.
Yes. Advance search filters by name, subject, To, From and content, and MBOX to EML converter converts only matching mail.
Yes. Click any message and five views open: content, message header, properties, hex and raw message.
Yes. Gmail, Office 365 and IMAP sit in the Export menu. Sign in to the target account and the mail lands there.
No. MBOX to EML converter sets no size cap, and batch mode takes many files at once. Keep free disk space for your output.
No. MBOX to EML converter reads MBOX files on its own, so it works on a PC without mail client.
No. MBOX to EML converter opens your files read only, and output goes to a new folder.
No. Conversion happens on your PC with no upload. Corbett never sees your MBOX files or messages.
No. MBOX to EML converter installs on Windows only. Copy your MBOX files to a Windows PC and convert them there.
Free demo of MBOX to EML 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.
Windows 11 (64 bit), 10, 8 and 7, plus Windows Server 2016, 2012 R2 and 2008. There is no macOS or Linux build.
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.
MBOX guides
Every page below covers one MBOX job and answers questions it raises.
Getting into the MBOX
Use the EML files
Other mail files sit on email converter tool page. Account moves use Email Migration Tool or IMAP Migration Tool, broken archives belong with email recovery software and email viewer software opens mail files free. Save a live account with Office 365 Backup Tool, Outlook.com Backup Tool or Gmail Backup Tool.
Get started
Test MBOX to EML Converter on a spare MBOX copy first. Full access is from $99 in a single payment, and refunds are open for 30 days.
Download free demo Purchase now
87.4 MB · Windows 11 to 7 and Windows Server 2025 to 2008 · 30 day money back