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. Viewing is free on Windows with no Outlook, Thunderbird or account needed.

Download free viewer Purchase now

4.6 out of 5 from 683 reviews

Files open in view mode on your PC. Nothing is modified and nothing is uploaded.

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

Viewing and searching free Export licence $99 lifetime

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 handles Outlook PST and OST, Outlook for Mac OLM, MBOX, EML, MSG, OFT, DBX, Google Takeout, Maildir and vCard.

No mail client needs installing. Spare PC with no Outlook still opens 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 opens 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

Open emails

Open Content, Header, Hex and Raw Views

Click a message and email viewer opens it with tabs for Content, Message Header, Hex View, Raw Message and Properties. Open 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

Email Data Files under Open lists every file type Corbett opens. 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. Full guide with screenshots sits below.

Open your mail file

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

Browse your folders

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

Open 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 open 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

Open mail from programs already on your PC

Attachments in view

See what an email contains before you save

Extract menu

Pull attachments, addresses and phone numbers

Recent files

Reopen your last files in one click

View mode only opening

Your file stays untouched

Works offline

No login and no upload

USB and NAS sources

Open 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 open emails. Viewing and searching cost nothing so your first check takes minutes.

Download free viewer

Free to open

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?

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

Legal and HR teams

Open 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

Open 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 open what it holds.

Why Corbett

Why Choose Corbett Email Viewer?

Reasons buyers choose Corbett email viewer software.

Free email viewer

Open, open and search at no cost

Works offline

No login and no upload

Original stays safe

Files open in view mode

Ten file types

One email viewer for PST, MBOX, EML and more

No mail client needed

Open 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

Refund window on export licence

Before you start

What Email Viewer Software does and Skips

Corbett opens 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 opens PST, MBOX and EML files
View mode 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 login and no upload
Edit, send or delete emails	No	Viewer opens only. Use a mail client to write or remove mail
Damaged files	No	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? Open Repair PST file without ScanPST tool.

Client or viewer

Email Viewer 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 like Outlook	email viewer
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 opens its own files	PST, MBOX, EML, MSG, OLM and more
View mode 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

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

Viewer choice

Email Viewer vs Single Format Viewers

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 open	Free	Free

Global recognition

Email Viewer Software Users Trust

Users rate Corbett 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 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. Local drive opens faster than a network share.

Close your email program

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

Check file source

Open files only from senders and drives you trust. 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.

Open 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

File that Outlook or Thunderbird cannot open needs repair before it opens here.

Common questions

Email Viewer Software FAQs

File types, views, limits and licence answers.

What is email viewer software?

email viewer opens a mail file like 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 Corbett free?

Yes for viewing. Open files, browse folders, open 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 opens 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 opens profiles of mail programs on your PC.

Do I need Outlook or Thunderbird to view emails?

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

Does email viewer software change my original file?

No. Your file opens in view mode. Nothing inside it is altered, moved or deleted.

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

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

How do I open a PST file without Outlook?

Go to 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. Corbett opens them with no Outlook installed.

How do I open an MBOX file?

Use 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 open every message with attachments and headers.

Can email viewer 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 open them like any other file. Corbett installs on Windows only so copy your OLM file to a Windows PC first.

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.

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 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.

Is there a file size limit for viewing?

Corbett sets no viewing limit. Outlook sets its own cap so a large PST can 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. Viewer opens 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 handles PST, MBOX, EML, PDF, HTML, TXT, CSV, vCard, ICS and sends mail to Gmail, Office 365 or IMAP. Email Converter Tool handles file to file jobs.

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

Viewing works from files. Save a live mailbox as files first with Email Backup Software and then open those files here.

Which Windows versions work?

Corbett 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 can one licence activate?

Personal licence works on 5 machines, Business works on 25 and Enterprise works on 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.

By file type

Email Viewer Pages by File Format

Every page below handles 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? Open Email Migration Tool. More walkthroughs include 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