Thunderbird Mail Viewer




Free Thunderbird Mail Viewer

Utilize a one click solution for viewing Mozilla Thunderbird email messages from .mbox files independently. The Thunderbird mail viewer helps to open and read Thunderbird inbox file emails. You can browse and view more than one thunderbird mail files at once.

  • Scan and Preview Email Messages Along with Respective Attachments
  • Allow Reading Multiple Thunderbird Files at a Time
  • Detects Thunderbird Profile Contains All Files if Email Client is Installed on Windows PC
  • Mozilla Thunderbird Installation is Not Required to Open Old Email Files
  • Supported Windows 10, 8, 7 and Windows Server 2016, 2012 R2, 2008

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Free Thunderbird Email Viewer – Overview

A Brief Information About Thunderbird and Its Email Files!

If you are a new user of Mozilla Thunderbird and don't have more idea about this mail client or its files then this section will make sure all your doubts.

Thunderbird is a free open source desktop based mail client developed by Mozilla and offers E-mail and Newsgroup functions. It is a cross-platform mail client available for Windows, MAC OSX and Linux operating systems. The Mozilla Thunderbird store all mails in a plain text file that is called .mbox which is supported by almost 20+ email clients. But when user need to open old thunderbird email files independently that time a Thunderbird mail viewer is required. You can also use these files with MS Outlook by converting MBOX files to PST format.

Default Location of Mozilla Thunderbird Files

  • For Windows OS:
    C:/Documents and Settings/username/AppData/Roaming/Thunderbird/Profiles/biwqp6xu.default/Mail
  • For MAC OSX:
    /Macintosh HD/Users/Library/ Thunderbird/Profiles/
  • For Linux and Unix: ~/.thunderbird/

File Formats with Their Extensions

Each mail folder (Inbox, Sent, etc.) is stored as two files one with no extension and one is with .msf extension.


  • Inbox (without extension): This is the main file of Thunderbird mail that stores all your inbox email messages which is the mail file itself (in 'mbox' format). So you can directly use this file for viewing emails. Otherwise use Thunderbird ImportExport tool to export Thunderbird folders to MBOX format.
  • Inbox.msf: This is another file which is the index (Mail Summary File) to the mail file that contains summary of emails.

Note: Without extension file contains your all messages and attachments so view thunderbird mailbox file (Inbox) with this tool

Useful Features Helps to View Thunderbird Mailbox Files

Some Highlighted Features of Mozilla Thunderbird Message Viewer Software

Auto Detection

Auto Detection of Files

This is an advance feature of the Thunderbird message viewer software which automatically detects and load mail folders. But this function works only when Thunderbird mail client is installed on your PC.

Scan and Preview

Scan and Preview Messages

In the initial state the tool scans selected Mozilla Thunderbird files and generates a complete preview for message in original folder structure. You can view email content by clicking on specific message.

Open Thunderbird Files

Open Multiple Email Files

If you have more than one Thunderbird mail files and wants to view load all them at once then this function will help to do so. You can browse a folder contains multiple .mbox files to view messages.

View Modes to Analyze Emails

Multiple View Modes to Analyze Emails

The Thunderbird Message Viewer software offers different view options by using then you can analyze your emails for forensic purpose. Hex and MIME views are generally used for email investigation purposes.

Free Thunderbird Email Viewer Tool System Requirement

Software Download

Size: 14.4 MB

Version: 4.0

MD5: fedacf9b6fb4e5fe19a50a59c388cefa

Trial Limitations

Free Version of Thunderbird Mail Viewer only preview all Emails with Attachments.

System Specifications

Hard Disk Space
100 MB of free hard disk space required

2 GB of RAM

Minimum 2.4 GHz Processor

Supported Editions

Windows 10, 8, 7 (32 bit or 64 bit) and Windows Server 2016, 2012 R2, 2008.


  • Microsoft .NET framework 4.5 or above should be installed.
  • If you are using Windows 10, 8, 7 (32 bit or 64 bit) & Windows Server 2016, 2012 R2, 2008, then please launch this tool as "Run as Administrator".


Q. Is your Antivirus blocking the software export process?

A. Please disable Anti-virus temporarily / Allow access (Whitelist) from Antivirus settings for proper working of the software.

Q. Unable to Create Output in destination?

A. Please avoid NAS, SAN, Network or Shared Drive. Source file should be on the migration machine to perform successful conversion.

Electronic Delivery

The delivery of the product is automated, You will receive an email containing both the link to download the product and the activation key within few minutes after payment confirmation.

Features Comparison

Get an Overview of Thunderbird Mail Viewer Features – Free and Pro Version

Features FREE Version PRO Version
Open Thunderbird Email Files
Preview Details of Thunderbird Files
Preview Emails with Multiple View Modes
Windows 10, 8, 7 (32 bit or 64 bit) and Windows Server 2016, 2012 R2, 2008
Advance Search and Naming Options
Print or Save Thunderbird Email Files
Cost FREE $69

Frequently Asked Questions

Listed Commonly Asked Questions and Answers

You can read multiple MBOX files at a time.
No, It is not mandatory to have Thunderbird installed on your machine.
There is no limitation on the file size of MBOX file.

What Customers Are Saying

Verified Purchase Reviews – Thunderbird Email Viewer Tool

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