Corbett

OST to EML Converter

Corbett OST to EML Converter saves Outlook OST mail as separate EML files for Thunderbird, Windows Live Mail, Apple Mail and Outlook. Single or bulk runs keep folder hierarchy, attachments and email headers. Advanced filters narrow the output, and a free demo shows the result first.

Download free demo Purchase now

4.6 out of 5 from 375 reviews

Conversion runs on this PC. Corbett never gets the OST file.

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

Lifetime licence from $99 Demo converts 10 items

EML facts

OST to EML Converter for Windows

An OST file keeps mail inside one locked container, while an EML file stores a single message and opens almost anywhere. The tool splits the container into plain EML files and leaves the data as it was.

Kept in every EML file

Email bodies
Attachments
Sender and receiver
Subject lines
Dates and times
Folder hierarchy
Message headers

OST input

Offline OST files
Orphaned OST files
Single OST files
Many OST files at once
Filtered selections
Chosen folders
Emails, contacts and attachments

Also available

EML (main output)
PST
MBOX
PDF
vCard
CSV, TXT and HTML
Attachments alone
Email addresses alone

Outside EML

Contacts
Calendars
Tasks
Notes

Why Mail Moves to EML

EML is a plain, widely supported mail format. Once an OST file is exported to EML, any mail client can import the messages, and a backup copy can sit on an internal or external disk.

Import EML files to Outlook

Core features

Four Moves From OST to EML

Install, select the OST files, set filters and save as EML.

Install

Download and Install

Run the setup file on Windows and launch the software. The main window opens ready for OST files.

Free demo available
Windows 10, 8 and 7
Light on disk space
No other program needed

OST folder tree with selection checkboxes

Folder selection

Select the OST Files

Browse to the OST files and add them. The preview shows folders and items in the source order before any export.

Items listed by folder
Source order kept
Preview before export
Chosen folders only

Message preview

Check Mail Before It Converts

The preview lets admins see an email in full before the EML files are created.

Content shows the email body
Message Header lists From, To and Subject
Properties reports item attributes
Hex View and Raw Message show stored values and code

Selective backup

Set Filters for the EML Output

Apply date, To, From, subject and address filters so only the required mail reaches the EML folder.

Date filter
To and From filter
Subject filter
Address filter
Contact filter
Attachment filter

Output options

Select EML and Convert

Choose EML as the target format, point the tool at a local or external drive and start the run. Every message lands as its own file.

EML files saved to a drive of choice
Attachments kept with the mail
Need PST files? See the OST to PST Converter
Want MBOX files? Try the OST to MBOX Converter for that job

Before converting

Preparation for OST to EML

Three quick checks save time later.

Source file

Locate the OST

Find the OST file in the Outlook data folder and copy it to a safe place before the run begins.

Item scope

Everything or a filter

Convert all folders in one pass, or apply filters if just a slice of the mailbox needs EML files.

Target drive

Leave room for output

Every email becomes its own EML file, so a large mailbox needs plenty of room on the destination disk.

Opening the source OST in Outlook is covered in Import OST file into Outlook and OST reached maximum size.

Free demo

Try the OST to EML Converter Free

The free demo converts 10 messages or folders. Open the sample EML files before buying.

Download free demo

Before purchase

Manual Route or OST to EML Converter

Outlook has no option to save an OST file as EML, and it cannot open an orphaned file. The table compares the manual path with the tool.

Task	Manual route	Tool
Cost	Free	$99 one time
Single email	Save from a mail client	Works too
EML file output	Not offered in Outlook	One EML per email
Bulk jobs	One item at a time	Many OST files in one go
Folder hierarchy	Often reshuffled	Kept as in the source
Attachments	Handled separately	Kept with the email
Filters	Mail search only	Date, To, From, Subject, Address
Other formats	Not offered	PST, MBOX, PDF, CSV, HTML

Just the green row is possible by hand.

Attachments alone can be pulled out with Extract attachments from OST files .

Specifications

OST to EML Converter Requirements

Download details

Version: 3.0
Download size: 47.6 MB
Demo limit: 10 items
Delivery: Electronic: the link and key come by email
Licence: Personal: 2 PCs. Business: 10 PCs. Enterprise: unlimited PCs.

Download Now

System

Hard disk: 100 MB free space
RAM: Minimum 512 MB, 1 GB is better
Processor: 1 GHz CPU, 2.4 GHz advised
Interface: English
Input: Outlook OST files

Supported editions

Windows 10 in 32-bit or 64-bit, plus Windows 8, 7 and all lower versions.

Start with Run as Administrator.

Corbett has built Windows email utilities since 2020. Setup questions and early problems go to the support team.

Working process

OST to EML Converter in Action

Want text steps? The Import EML files to Outlook post shows where the exported EML files go next.

Common questions

OST to EML Converter FAQs

Steps, data loss, the demo and bulk jobs.

How can OST emails be exported to EML format?

Download and install the tool, then select the OST files to convert. Choose the advance filters to apply, select the EML format and go ahead with the conversion.

What about data loss during conversion?

None. The tool is built for 100% data integrity, so folders, attachments and headers arrive unchanged.

Will the demo version work for me?

Yes. The demo handles 10 messages or folders for free per run, enough for a trial of the output.

Does the tool handle many OST files together?

Yes. The tool exports many OST files to EML format in a single go.

Is it possible to export only chosen emails?

Yes. Filters on date, To and From, subject and address limit the run to matched mail.

Are attachments exported too?

Yes. Choose EML format and the attachments convert with the message. They can also be extracted alone.

Is the folder tree preserved?

Yes. The folder hierarchy of the OST file stays the same after conversion.

Can I preview the OST emails first?

Yes. A preview of the OST files appears before the conversion starts.

Can the tool export to other formats?

Yes. PST, MBOX, PDF, CSV, HTML, vCard and text output are available as well.

Which Windows editions run the tool?

Windows 10 in 32-bit and 64-bit, plus all lower versions such as 8 and 7.

How much RAM is required?

RAM starts at 512 MB with 1 GB preferred. The disk needs 100 MB of free room.

How fast is the processor requirement?

A 1 GHz processor works, and 2.4 GHz is recommended.

Which licence should be bought?

Personal activates 2 PCs or laptops, Business activates 10 and Enterprise activates unlimited PCs.

Is the software delivered electronically?

Yes. Delivery is electronic after payment.

Is there a refund window?

Yes. A 30 days money back guarantee applies.

Step by step

Reading and Moving EML Mail

Posts on opening, moving and reading EML mail.

Open the EML files

Move the mail on

Work with the data

Hosted mailbox moves go through the Email Migration Tool . Server cutovers use the IMAP Migration Tool. Further file types appear in the email converter tool. Broken archives belong with the email recovery software. Mail files can be opened in the email viewer software. Same family: OST to PDF Converter and OST Converter Software. Also see the EML Converter Tool, PST to EML Converter, MBOX to EML Converter, MSG Converter Tool and Office 365 Backup Tool.

User testimonials

OST to EML Converter Reviews

375 ratings from users who turned OST data into EML with Corbett.

4.6 out of 5

Collected across 375 reviews gathered from portals and email, with no edits.

Did the job really well

This OST to EML converter tool is just the right app for my needs. I had to convert my OST emails to EML format. The application did the job really well.

Anthony Shueh

Simple and quick

Great application. It was quite simple to use, and converted my files super quick, too. I will suggest everyone to give this software a try. Download the free OST to EML Converter demo version to understand the working.

James Bruce

Done in a few minutes

A colleague of mine mentioned this Corbettsoftware OST to EML file Converter tool to me. Suffice it to say, I’m glad the application worked so efficiently and converted all my Outlook OST files to EML file format within a few minutes.

Sarah Corea

Get started

Convert Offline Outlook Mail to EML Today

Try the demo on a spare copy of the OST file and open the EML output. One $99 payment buys the licence, and a refund is open for a month.

Download free demo Purchase now

47.6 MB · Windows 10 and below · 30 days money back