Corbett
Corbett Email Converter Tool opens a mail file and saves its emails in another format. Load PST, OST, MBOX, EML, MSG, OLM and more, then convert to PST, MBOX, EML, PDF, HTML or CSV. Folders, attachments and dates stay in place.
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Works offline on local files. Corbett never asks for a mailbox password.
Free demo, scanned clean on VirusTotal and a 30 day refund window.
Lifetime licence from $99 Demo converts 10 emails per folder
Core features
Five screens of Corbett email converter software, in conversion order.
Source files
Open Email Data Files and email converter tool lists Outlook PST and OST, Outlook for Mac OLM, MBOX, EML, MSG, OFT, DBX, Google Takeout, Maildir and vCard files. Desktop Email Clients finds profiles of mail programs on your PC.
No mail client needs installing to open its files so a spare PC with no Outlook still works. email converter software opens your file and leaves it as it was.
Batch loading
Select Choose Files for one or a few mail files. Select Choose Folders to load an entire directory of EML or MSG files in one step.
Loaded files appear in one tree so email converter software handles several PST, MBOX or EML files into one output in a single session.
Message preview
Click a message and Corbett opens it beside four analysis views. Content shows text and address fields while Message header lists routing details. Hex and raw message views show stored code and Properties reports size and attachments.
Quick Search finds a keyword and highlights matches in yellow. Advance Search offers All Search for every field including calendar and date and Emails Search for name, subject, To, Cc and content.
Output formats
Email files export to PST, MBOX or EML. Document files export to PDF, HTML, TXT, CSV, vCard or ICS. Select your format once your preview looks right.
That menu lists Gmail, Office 365, IMAP and Thunderbird for sending converted mail straight into an account. Email Recovery Software handles that job in full.
Export options
Switch on open folder after export, leave out greyed out folders, create empty folders, delete old folders and include email headers. For PST output, create an individual PST file for every folder.
Select Browse to choose a destination, then Save. Live progress shows every folder as it converts and Open Folder takes you to your output.
Why convert
Mail file opens only in programs that open its format. Microsoft Outlook data files documentation notes that new Outlook opens PST files only when classic Outlook is installed so a format change is your quickest route.
Switch email client
Convert emails from PST to MBOX for Thunderbird or from MBOX to PST for Outlook and keep folders in place.
Keep legal copies
Convert emails to PDF so a court, auditor or client opens them with no email program.
Archive old mail
Save mail as EML, HTML or TXT files that any computer opens in ten years.
Open files with no client
Open a PST, MBOX or MSG file on a PC that never had Outlook or Thunderbird.
Build contact lists
Export addresses and phone numbers from old mail to CSV for mailing lists.
Move from Mac to Windows
Convert OLM files from Outlook for Mac into PST for Outlook on Windows.
Supported files
Email Data Files under Open lists every file type Corbett opens. Mix several types in one session.
| Source | File types | Popular output |
|---|---|---|
| Outlook for Windows | PST, OST, MSG and OFT files | MBOX, EML and PDF |
| Outlook for Mac | OLM files | PST, MBOX and PDF |
| Thunderbird and Apple Mail | MBOX files | PST, EML and PDF |
| Single message files | EML files | PST, MBOX and PDF |
| Outlook Express and Windows Mail | DBX files | PST and EML |
| Google Takeout | Google Takeout mail file | PST and PDF |
| Maildir | Maildir folders | PST and MBOX |
| Contacts | vCard files | CSV and PDF |
Installed desktop email clients load too. Select Open, then Desktop Email Clients. RFC 4155 defines MBOX as many messages in one file, while EML retains one message per file.
File or mailbox
Email converter tool works from a file on your disk. Match your job below to where your mail sits.
File to file
MBOX file that Outlook needs as PST or a folder of EML files needed as one PDF. Email converter tool handles that job.
Mailbox to file
Mail still sits in a live account? Open Email Backup Software to save it as files.
File to mailbox
Email Recovery Software handles uploading a converted file into a live account.
Mailbox to mailbox
Moving mail between two live accounts? See Email Migration Tool.
All four jobs share one download. Select your mode once software opens. Email Viewer Software opens a file with no output at all.
Working process
Four steps take a mail file to its new format. Try them on one file in free demo first.
Open your mail file
Start email converter software, select Open, then Email Data Files and choose your file type. PST, MBOX, EML, MSG, OLM and more sit in one list.
Choose files or folders
Select Choose Files for one file or Choose Folders for many. Your emails load as one folder tree.
Preview and select folders
Click any email to preview it. Search by keyword, tick folders you want and set filters to trim your conversion.
Export and save
Select Export, choose PST, MBOX, EML, PDF or another format, set options, select Browse for a folder and press Save.
Want screenshots for every click? Follow MBOX to PST converter guide.
Working process
Prefer text? Open MBOX to PST guide for every click with screenshots.
More options
Small options that save hours when you convert emails in bulk.
Batch email conversion
Many files converted in one session
Folder hierarchy kept
Inbox, Sent and subfolders stay in order
Attachment extraction
Save attachments alone from any file
Email address extraction
Export addresses to CSV
Phone number extraction
Pull numbers from message bodies
File naming options
Name output by From, To, Date or Subject
Smart filters
Date, sender, subject and size
Quick and advance search
Find emails before you convert
Four preview views
Content, header, hex and raw message
Unicode PST
Modern PST format for Outlook
Split and merge PST
Cut large PST files or combine many
Individual PST per folder
One PST file for every folder
Include email headers
Keep full header data in output
Log and CSV report
See what converted and what failed
USB and NAS targets
Save output to external and network drives
Choose output
Email converter tool saves to nine file formats. Match format to where your converted mail will open.
| Format | Best for | Opens in |
|---|---|---|
| PST | One file per mailbox with folders preserved | Microsoft Outlook |
| MBOX | Moving mail to a free email client | Thunderbird and Apple Mail |
| EML | One file per email, quick to search | Windows Mail and most email clients |
| Legal files, audits and printing | Any PDF viewer | |
| HTML | Reading mail with no email client | Any web browser |
| TXT | Plain text archives | Any text editor |
| CSV | Lists of senders, dates and subjects | Excel and Google Sheets |
| vCard | Contacts moved into a phone or address book | Outlook, Gmail and phones |
| ICS | Calendar entries shared between apps | Outlook, Google Calendar and Apple Calendar |
Free demo
Test Email Converter Tool on a Real File
Install free demo, load a PST, MBOX or EML file, select a folder and choose a format. Free demo converts 10 emails per folder so your output is quick to check.
Download free demoTry before you buy
Free demo of email converter tool opens, previews and searches your full file. Only conversion is capped.
| Feature | Free demo | Full version |
|---|---|---|
| Load files and folders | Yes | Yes |
| Preview, search and analysis views | All available | All available |
| Emails converted per folder | 10 | Unlimited |
| File size and file count limit | Output stops at 10 per folder | None |
| Price | Free | From $99 one time |
Use cases
Anyone who must convert emails from a file that will not open where needed.
People switching email client
Convert emails from PST to MBOX for Thunderbird or from MBOX to PST for Outlook and keep years of mail.
Legal and compliance teams
Convert emails to PDF with sender, date and attachments named clearly for case files and audits.
IT admins after a migration
Convert leftover OLM, DBX, Maildir and server files into PST that users open in Outlook.
Mac to Windows movers
Convert OLM files from Outlook for Mac into PST for a new Windows PC.
Investigators
Preview message header, hex and raw views for a file of unknown origin before you export.
Marketers and list builders
Export addresses and phone numbers from old mail to CSV for outreach.
Why Corbett
Reasons buyers choose Corbett email converter software.
No subscription
Lifetime price from $99
Works offline
No login and no upload
Original stays safe
Source files open in view mode
Ten file types
Email file converter for PST, MBOX, EML and more
No size limit
Any file size and any file count
No mail client needed
Convert emails with no Outlook
Smart filters
Date, sender, subject and size
30 day refund
Refund window after purchase
Before conversion
Corbett turns a mail file into another format. Here is what that includes and where it stops.
| Capability | Supported | What it means |
|---|---|---|
| File to file conversion | Yes | PST to MBOX, MBOX to PST and EML to PDF with folders kept |
| Mail client installed | Not needed | Files open on a PC with no Outlook or Thunderbird |
| Source file | View mode only | Output goes to a new folder and your original stays as it was |
| Internet and passwords | Not needed | Conversion works offline on local files |
| Damaged files | Repair first | Badly damaged PST needs repair before it converts |
| Live mailboxes | Other mode | Use Email Backup Software or Email Migration Tool for accounts |
| Mac and Linux | No | Email converter software installs on Windows only |
Manual or tool
Saving messages one by one from your email program works for a handful of emails. Here is where manual email conversion stops.
| Task | Manual method | Email Converter Tool |
|---|---|---|
| Cost | Free | From $99 one time |
| Handful of emails | Save As in your email program | Works too |
| Large archive | One message at a time | Every folder in one session |
| Folder structure | Rebuilt by hand | Kept in order |
| Many files | Repeat for every file | One batch of files or folders |
| Filters and search | Client rules only | Date, sender, subject and keyword |
| PDF file names | Typed in by hand | Named by From, To, Date or Subject |
| Machine without original client | Cannot open your file | Opens files by itself |
Manual saving works in two rows only.
Global recognition
Users rate Corbett email converter tool 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 it with Run as Administrator.
Corbett has built Windows email utilities since 2020. Setup trouble and first use questions go to our support desk.
User testimonials
email converter software earns 683 reviews on software index sites and customer feedback.
Collected across 683 reviews from software indexes and customer feedback. Three reviews below are unedited.
I just wanted to convert emails from Gmail to PDF format. After purchasing this email conversion tool on a deal, I realized that apart from this, it can also convert emails from multiple platforms. Also, they provide dedicated support team that assist users 24*7 via live chat and email support.
I had to convert several emails from my Yahoo account to PDF format. Also, the emails I wanted to convert were from a particular sender. After I got tired of searching all possible manual methods I asked a colleague. He suggested this app and the software performed well.
I had a bunch of AOL mails that I needed to convert and move into Outlook PST format. A quick Google search led me to this mail converter software. After reading all the specs and reviews, I gave this email conversion tool a shot. The interface is pretty simple, so I did not face any difficulties during the conversion process.
Before conversion
Three short checks keep your email conversion clean.
Copy files to a local drive
Gather your PST, MBOX or EML files in one folder on your PC. Loading from a local drive is faster and safer than a network share.
Close your email program
Quit Outlook or Thunderbird first. Open program can lock its own file and block loading.
Check free disk space
PDF and EML output can take more room than your source file. Select an output drive with plenty of space.
Best practice
Email conversion only helps if your mail arrives in full. Four habits keep your data safe through it.
Backup first
Copy your original file before you start. Keep 3 copies on 2 types of media with 1 copy off site.
Start with a small file
Convert one small file and open a few messages in your new format. Catch a wrong setting before a large job.
Repair damaged files first
File that Outlook or Thunderbird cannot open needs repair before conversion. Converting never fixes corruption.
Keep originals until checked
Store your source files until folder counts match. Delete them only after you open converted mail.
Common questions
File types, formats, limits and licence answers.
Email converter tool opens a mail file like PST, MBOX or EML and saves its emails, attachments and folders in another format. Corbett Email Converter Tool does that offline on Windows.
Open Corbett, select Open, then Email Data Files and your file type. Select Choose Files or Choose Folders, then Open. Preview your emails, select Export, choose a format, set options, select Browse for a folder and press Save. Free demo lets you test every step first.
Outlook PST and OST, Outlook for Mac OLM, MBOX, EML, MSG, OFT, DBX, Google Takeout, Maildir and vCard files all sit under Email Data Files. Desktop Email Clients opens profiles of mail programs installed on your PC.
PST, MBOX and EML for email files, plus PDF, HTML, TXT, CSV, vCard and ICS for documents. Export menu lists Gmail, Office 365, IMAP and Thunderbird for sending mail into an account.
No. Email converter tool opens PST, MBOX, OLM and other files by itself so a PC without Outlook or Thunderbird still converts them.
No. Your source file opens in view mode and output goes to a folder you select. Original files stay exactly as they were.
Yes. Email converter tool opens an entire directory with Choose Folders and several PST, MBOX or EML files convert in one session.
Go to Open, Email Data Files and Outlook PST/OST Files. Load your PST file, select Export and choose MBOX. Thunderbird and Apple Mail open MBOX files, which RFC 4155 defines as many messages in one file.
Use Open, Email Data Files and MBOX Files. Choose your file, select Export and choose PST. Switch on create individual PST file for every folder if you want one PST per folder. Outlook for Windows opens PST files.
Yes. Select Choose Folders to load a directory of EML or MSG files, select Export and choose PDF. email converter software names output by From, To, Date or Subject so thousands of PDF files stay quick to search.
Yes. Google Takeout and MailDir Files sit in Email Data Files beside PST and MBOX and export to any format on your Export menu.
Yes. Open OLM files on Windows and convert them to PST, MBOX, EML, PDF or HTML. Email converter software installs on Windows only so OLM files must be copied to a Windows PC first.
Yes. DBX files from Outlook Express open under Email Data Files and convert to PST, EML and more formats.
Yes. Folder hierarchy, dates, headers and attachments transfer to your output.
Yes. Email converter software lets you tick folders and set filters for date range, sender, subject or attachment. Only matching emails convert.
Yes. Quick Search finds a keyword from your search bar and highlights matches in yellow. Advance Search offers All Search for every field including calendar and date and Emails Search for name, subject, To, Cc and content.
Email converter tool sets no limit. Outlook sets its own cap and Microsoft PST file size limits documentation explains a 50 GB default for Unicode PST files. Splitting a large PST by size retains files quick to open.
No. Email converter tool converts files that open normally. Repair a badly damaged PST first, then convert it.
Yes. Contacts export to vCard and CSV and calendar entries export to ICS, alongside emails, attachments, tasks and notes.
Yes. Corbett extracts attachments, email addresses and phone numbers from loaded files. Email Attachment Extractor and Email Address Extractor do only that job.
Free demo opens your full folder tree and gives you every filter and preview. Conversion stops at 10 emails per folder, enough to test output before you buy.
Email converter software works on Windows 11 (64 bit), 10, 8 and 7, plus Windows Server 2016, 2012 R2 and 2008.
Personal licence works on 5 machines, Business works on 25 and Enterprise works on 100. All three are one time payments with lifetime validity.
Yes to both. Every licence includes 24/7 customer support and refunds are accepted within 30 days of purchase.
Converter pages
Every page below handles one source format and its most requested outputs.
Offline Outlook files
Thunderbird and Apple Mail
Single message files
Outlook for Mac
Servers and older clients
Step by step walkthroughs include Convert PST to PDF, Convert EML to PDF, Convert MSG files to PST, MBOX to CSV converter, Convert OLM to CSV files, DBX to TXT, Convert vCard to PDF, OFT converter, Zimbra to PST converter, Maildir to PST, Google Takeout converter, Open MSG file without Outlook, Convert VCF to Excel, Print EML files to PDF, Import PST to Thunderbird, Open DBX file in Outlook and Export Zoho Mail to PST.
Get started
Test Email Converter Tool on one file 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