Corbett

Email Viewer Software

Corbett Email Viewer Software opens PST, OST, MBOX, EML, MSG, OLM and more mail files and shows every message with attachments and headers. No Outlook, no Thunderbird and no account needed. Viewing is free. Windows only.

Download free viewer Purchase now

4.6 out of 5 from 683 reviews

Files open read only on your PC. Nothing is modified and nothing is uploaded.

Free to view, scanned clean on VirusTotal and a 30-day money-back window on your export licence.

Viewing and searching free Export licence $99 lifetime

Quick answer

What Is Email Viewer Software?

Email viewer software opens a mail file on your disk and shows its emails in a readable list, with no mail client installed. Corbett Email Viewer Software reads a PST, MBOX or EML file offline and previews content, headers and attachments on Windows.

What it opens

PST, OST, OLM, MBOX, EML, MSG, OFT, DBX, Google Takeout, Maildir and vCard files

What you see

Folders, message content, headers, attachments, hex and raw source

Who uses it

IT admins, legal teams and home users holding an old mail file

Core features

Email Viewer Features by Screen

Four screens of Corbett email viewer software, in reading order.

Email viewer software Open menu with Email Data Files list

Open files

Open Any Mail File from One Menu

Open lists Email Data Files, Desktop Email Clients, Email Accounts, Clear File/Folders and Recent Files. Email Data Files covers Outlook PST and OST, Outlook for Mac OLM, MBOX, EML, MSG, OFT, DBX, Google Takeout, Maildir and vCard.

No mail client needs installing. A spare PC with no Outlook still reads a PST, and Recent Files brings back your last file in one click.

Email viewer folder tree with message counts

Browse folders

Browse Your Folder Tree

Your file loads in a checkbox tree with a count beside every folder. Select a folder and its emails list beside your tree with sender, subject and date.

Compact View hides empty folders, so a large archive stays short to scroll.

Email preview with content, message header, hex view and raw message tabs

Read emails

Read Content, Header, Hex and Raw Views

Click a message and email viewer software opens it with tabs for Content, Message Header, Hex View, Raw Message and Properties. Read message body, check sender routing in message header or inspect source bytes.

Attachments show with every message, so you check what a file holds before you save anything.

Quick search highlighting a keyword in yellow across emails

Search Emails with Quick and Advance Search

Type a keyword in Quick Search and matching emails list with that word highlighted in yellow. Advance Search offers All Search for every field and Emails Search for name, subject, To, Cc and content.

Search a large mail file for one sender or one invoice number in seconds, with no import into Outlook first.

File coverage

Email File Viewer for Ten File Types

Select Open, then Email Data Files, and email viewer software lists every file type it reads. Open several files in one session.

Source	File types	Made by
Outlook for Windows	PST and OST files, plus MSG and OFT	Outlook export, archive or cached mailbox
Outlook for Mac	OLM files	Outlook for Mac export
Thunderbird and Apple Mail	MBOX files	Mail client export or backup tool
Single message files	EML files	Drag and drop saves or backup tools
Outlook Express and Windows Mail	DBX files	Old Windows mail stores
Google Takeout	Google Takeout mail file	Google account data export
Maildir	Maildir folders	Linux and server mail stores
Contacts	vCard files	Phone and address book exports
Desktop email clients	Installed mail profiles	Mail programs already on your PC

Want a page for one file type? Open Free PST Viewer Tool, Free MBOX Viewer Software or Free Google Takeout Viewer.

Working process

How to View Emails in Four Steps

Four steps take you from a closed file to readable emails in email viewer software. A full guide with screenshots sits below.

Open your mail file

Start email viewer software, select Open, then Email Data Files and your file type. Select Choose Files or Choose Folders and press Open.

Browse your folders

Your file loads as one folder tree with a count beside every folder. Select any folder to list its emails.

Read and search emails

Click a message to see content, message header, hex view, raw message or properties. Quick Search highlights keywords in yellow.

Export only if needed

Viewing ends here and costs nothing. Select Export when you want emails saved as PST, PDF or another format.

Want screenshots for every click? Follow MBOX to PST guide.

Working process

Email Viewer Software Video Walkthrough

Prefer text? Open MBOX to PST guide for every click with screenshots.

More options

More Email Viewer Features for Big Files

Small options that save time when you read mail from large archives.

Quick search

Keyword hits highlighted in yellow

Advance search

All Search and Emails Search by name, subject, To, Cc and content

Five reading views

Content, header, hex, raw message and properties

Compact View

Hide empty folders in a large tree

Several files together

Load many files or a full folder at once

Desktop client profiles

Read mail from programs already on your PC

Attachments in view

See what an email carries before you save

Extract menu

Pull attachments, addresses and phone numbers

Recent files

Reopen your last files in one click

Read only opening

Your file stays untouched

Works offline

No sign-in and no upload

USB and NAS sources

Read files from external and network drives

Free viewer

Open Your Mail File with Free Email Viewer Software

Install Corbett, load a file, browse folders and read emails. Viewing and searching cost nothing, so your first check takes minutes.

Download free viewer

Free to read

Free Viewing vs Export Licence

Reading is free. You pay only to save mail into another format or mailbox, which is a separate licence.

Feature	Free viewing	Export licence
Open files and folders	Yes	Yes
Preview, search and extract views	All available	All available
Emails exported per folder	10 in free demo	Unlimited
Export formats	Free demo tests every format	All formats and mailboxes
Price	Free	From $99 one time

Use cases

Who Needs Email Viewer Software?

Anyone who must read a mail file without its original program.

Legal and HR teams

Read emails from a case file and check headers, dates and attachments with no risk of altering evidence.

IT admins

Check what sits inside a leftover PST, OST or MBOX before you decide to keep, convert or delete it.

Backup checkers

Open a backup file and confirm folders, counts and messages before you trust it.

Users of a new PC

Read old Outlook or Thunderbird mail on a machine with no mail client installed.

Teams handling leavers

Browse a former employee archive to find one thread without importing it into Outlook.

Home users

Open an old family mail file or a Google Takeout download and read what it holds.

Why Corbett

Why Choose Corbett Email Viewer?

Reasons buyers choose Corbett email viewer software.

Free email viewer

Open, read and search at no cost

Works offline

No sign-in and no upload

Original stays safe

Files open read only

Ten file types

One email viewer for PST, MBOX, EML and more

No mail client needed

Read mail with no Outlook

Email file viewer search

Quick and advance search built in

Attachments in view

Check files before you save

30-day refund

Money-back window on export licence

Before you start

What Email Viewer Software Does and Skips

Email viewer software reads mail and never changes it. Check your job below before you download.

Capability	Supported	What it means
Open mail files with no client	Yes	A PC with no Outlook or Thunderbird still reads PST, MBOX and EML files
Read only opening	Yes	Your file stays as it was, so nothing in it is altered or moved
Preview and search	Yes	Content, header, hex and raw views, plus quick and advance search
Internet and passwords	Not needed	Files open offline with no sign-in and no upload
Edit, send or delete emails	No	A viewer reads only. Use a mail client to write or remove mail
Damaged files	No	A badly damaged PST needs repair before it opens
Mac and Linux	No	Email viewer software installs on Windows only

Need your mail in another format? Use Email Converter Tool. Damaged file? Read Repair PST file without ScanPST tool.

Client or viewer

Email Viewer Software vs Mail Clients

Microsoft Outlook data files documentation shows that Outlook opens a PST by adding it to a profile. Here is how that compares with a viewer.

Task	Mail client such as Outlook	Email Viewer Software
Cost	Needs a paid licence	Free to view
Program installed	Outlook or Thunderbird must be set up	Not needed
Adds a file to your profile	Yes, so your own mail mixes with it	No, your file opens apart
Many file types	One client reads its own files	PST, MBOX, EML, MSG, OLM and more
Read only safety	Mail can be edited or moved	Nothing changes in your file
Header, hex and raw views	Limited	Five reading views
Writing and sending mail	Yes	No

A mail client wins only when you must write or send mail.

Viewer choice

Email Viewer vs Single Format Viewers

LazyAdmin free PST viewer review shows that many free PST viewers limit search, attachments or export. Compare before you install.

Point	Single format viewers	Corbett Email Viewer Software
File types	One format per tool	Ten file types in one viewer
Search	Missing or basic in some tools	Quick and advance search
Attachments	Hidden in some free versions	Shown with every email
Reading views	Content only	Content, header, hex, raw and properties
Export later	Capped or locked in many tools	Same download, licence from $99
Cost to read	Free	Free

Global recognition

Email Viewer Software Users Trust

Users rate Corbett email viewer software 4.6 out of 5 from 683 reviews, and these software directories list it.

CNET
Download.io
UpdateStar
TopSoftware Advisor
SaaSHub
Uptodown

Specifications

Email Viewer Software 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.

Download Now

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: Mail files and desktop clients

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 Viewer Reviews from Users

Email viewer software earns 683 reviews on software index sites and customer feedback.

4.6 out of 5

Collected across 683 reviews from software rating hubs and customer feedback; three reviews below are unedited.

Email viewer for many providers

Viewing emails from so many different email service providers was never so easy before this. Props to the people behind this email viewer application. I would suggest this email viewer software to everyone.

Mark Rubin

Quick way to view email files

This email viewer tool was the perfect solution for my needs. If you're looking for a quick solution to view your email files, don't go any further. I would say this email viewer application is the best one to go for.

Summer Matthews

Reads mail from many clients

I highly recommend this email viewer tool to anyone looking for a quick solution for email viewing. Apart from its simple UI, I really liked the software's ability to view emails from so many different email clients.

Richard Faulkner

Before opening

Prepare Your Mail File for Viewing

Three short checks keep your email viewing smooth.

Copy your file to a local drive

Place your PST, MBOX or EML file in a folder on your PC. A local drive loads faster than a network share.

Close your email program

Quit Outlook or Thunderbird first. An open program can lock its own file and block loading.

Check file source

Open files only from senders and drives you trust. An unknown archive can hold unsafe attachments.

Best practice

How to Keep Email Viewing Safe

Reading mail should never put your data at risk. Four habits keep your files and your PC safe.

Keep a copy

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

Read before you open

Check message header and attachment names in preview before you save any file to disk.

Scan attachments

Scan every saved attachment with your security software before you open it.

Repair damaged files first

A file that Outlook or Thunderbird cannot open needs repair before it loads here.

Common questions

Email Viewer Software FAQs

File types, views, limits and licence answers.

What is email viewer software?

Email viewer software opens a mail file such as PST, MBOX or EML and shows its emails, attachments and headers without its original program. Corbett Email Viewer Software does that offline on Windows.

Is email viewer software free?

Yes for viewing. Open files, browse folders, read emails and search at no cost. You pay only to export mail to another format or into a mailbox, which is a separate licence.

How do I view emails from a PST or MBOX file?

Select Open, then Email Data Files and your file type. Select Choose Files or Choose Folders, then Open. Your folder tree loads and every message opens in preview with a click.

Which mail file types can it open?

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 loads profiles of mail programs on your PC.

Do I need Outlook or Thunderbird to view emails?

No. Email viewer software opens PST, MBOX, OLM and other files by itself, so a PC with no mail client still reads them.

Does it need an internet connection or a password?

Not for files. Files open offline with no sign-in and no upload, so your PC can stay disconnected.

Does email viewer software change my original file?

No. Your file opens read only. Nothing inside it is altered, moved or deleted.

Can I open several files in one email file viewer session?

Yes. Choose Folders loads an entire directory, and several PST, MBOX or EML files open in one session.

How do I open a PST file without Outlook?

Select Open, Email Data Files and Outlook PST/OST Files, then load your file. Microsoft Outlook data files documentation explains that PST files hold messages, contacts, appointments and tasks. Email viewer software reads them with no Outlook installed.

How do I open an MBOX file?

Select Open, Email Data Files and MBOX Files, then choose your file. RFC 4155 defines MBOX as many messages in one file, and Thunderbird and Apple Mail create it.

Can email viewer software open EML and MSG files?

Yes. Select Choose Folders to load a directory of EML or MSG files and read every message with attachments and headers.

Can email viewer software open Google Takeout mail?

Yes. Google Takeout Files sit in Email Data Files beside PST and MBOX, and open as a folder tree of your Gmail labels.

Can email viewer software open OLM files from Outlook for Mac?

Yes. Open OLM files on Windows and read them like any other file. Email viewer software installs on Windows only, so copy your OLM file to a Windows PC first.

Can email viewer software open Outlook Express DBX files?

Yes. DBX files from Outlook Express open under Email Data Files and list every folder and message.

Can email viewer software search emails inside a file?

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.

What reading views does email viewer software offer?

Five views per message: Content, Message Header, Hex View, Raw Message and Properties. They show message body, routing data, source bytes and item details.

Can I see attachments before I save them?

Yes. Attachments show with every message in preview, so you check names and types before you save a file.

Can I extract attachments, addresses or phone numbers?

Yes. Email viewer software has an Extract menu for attachments, email addresses and phone numbers from loaded files. Email Attachment Extractor and Email Address Extractor do only that job.

What does Compact View do?

Compact View hides empty folders, so a large archive with many blank folders stays short to scroll.

Is there a file size limit for viewing?

Corbett sets no viewing limit. Outlook sets its own cap, so a large PST may be slow to load. Keep files on a local drive for speed.

Can it open a damaged or password protected file?

No. Email viewer software opens files that load normally. Repair a badly damaged PST first, then open it.

Can I edit, send or delete emails in it?

No. A viewer reads only. Use Outlook or Thunderbird to write, send or remove mail.

When do I need a paid licence?

When you want to save mail out of your file. Export covers PST, MBOX, EML, PDF, HTML, TXT, CSV, vCard, ICS and sends mail to Gmail, Office 365 or IMAP. Email Converter Tool covers file to file jobs.

Can I view a live Gmail or Outlook.com mailbox?

Viewing works from files. To save a live mailbox as files first, use Email Backup Software, then open those files here.

Is a macOS or Linux build available?

No. Email Viewer Software runs on Windows 7 to 11 and Windows Server 2008 to 2025 only.

Which Windows versions work?

Email viewer software works on Windows 11 (64 bit), 10, 8 and 7, plus Windows Server 2016, 2012 R2 and 2008.

How many emails can free demo export?

Free demo exports 10 emails per folder, enough to test every output format. Viewing and search have no cap in demo.

How many PCs does one licence cover?

Personal licence covers 5 machines, Business covers 25 and Enterprise covers 100. All three are one time payments with lifetime validity.

Is customer support included, and can I get a refund?

Yes to both. Every licence includes 24/7 customer support, and refunds are accepted within 30 days of purchase.

How does my licence arrive?

By email once payment clears, with a setup link and your activation key attached.

By file type

Email Viewer Pages by File Format

Every page below covers one file type and what a viewer shows for it.

Free viewer pages

Opening files without their client

When viewing is not enough

Need another format? Use Email Converter Tool. Saving a live account? See Email Backup Software. Restoring a file into an account? Open Email Recovery Software. Moving one account to another? Read Email Migration Tool. More walkthroughs: Open PST file, Open MBOX file, Open Google Takeout files and Open DBX file in Outlook.

Get started

Start Reading Email Files with Corbett Today

Download Email Viewer Software and open your file at no cost. Export later needs a $99 one time licence, refundable for 30 days.

Download free viewer Purchase now

87.4 MB · Windows 11 to 7 and Windows Server 2025 to 2008 · 30 day money back