Import in Thunderbird Made Simple

Import Mailboxes into Thunderbird

All-in-one Thunderbird import solutions to directly add any mailbox into the Mozilla Thunderbird email client using free native and dedicated Thunderbird Import Tools. Secure expert-tested methods for bulk email data import into Thunderbird on Mac and Windows, with attachments, metadata, and folder hierarchy preserved.

Easy and fast mailbox integration into Mozilla Thunderbird using professional import solutions.

Free-Native Thunderbird Import Tool Add EML & MBOX with ImportExport NG Import Email Files (MSG, EML, MBOX) Import Outlook (OST/PST) in Thunderbird Import Cloud Mailboxes to Thunderbird Import Any Email Client in Thunderbird

Native Import

Built-in Thunderbird Import Tool

Thunderbird’s free built-in tool to integrate limited Profiles from some email clients into Thunderbird.
Import Mailboxes into Thunderbird without any third-party applications or add-ons for better security.

Limited Thunderbird Import Sources

Import Backed Up Thunderbird Profile
Import from SeaMonkey
Import from a configured Outlook Profile
Import address books and calendars from ZIP
Import Thunderbird Profile to New Computer

How to Use Native Thunderbird Importer?

01.

Open Thunderbird Email Application.

02.

Click on the Hamburger Menu >> Tools >> Import.

03.

Choose the source email client to import into Thunderbird.

04.

Select the email data to import in Thunderbird Profile.

05.

Follow the instructions on the screen and Start Import.

Expert Insight: The built-in Thunderbird import feature is limited to Profile imports from certain email clients. Use dedicated solutions listed below to import orphaned mailboxes or cloud email data into Thunderbird.

Thunderbird Add-On

Import EML/MBOX with ImportExport NG

ImportExport NG Add-On is a free extension to upload and access small EML and MBOX email data files in Thunderbird’s local folder.

How to Install and Use?

Steps to Use ImportExport NG to Import Email Data in Thunderbird

Install ImportExport NG

Click on the hamburger menu >> Themes and Add-Ons and install the ImportExport NG add-on.

Select the Import Folder

Select or create a folder in Thunderbird. Right-click on the folder and choose ImportExport NG to start the process.

Select the MBOX/ EML Files

Select EML or MBOX option >> Choose if you need to import a directory or file. Select and open email files to be imported into Thunderbird.

Complete Import and Restart

Wait for the import process to be completed and restart Thunderbird to properly load imported email files.

ImportExportTools NG - Uses

Import MBOX Mailbox in Thunderbird
Import EML/ EMLX Files in Thunderbird
Add Individual or All Directory Files
Only for Thunderbird imports under 4 GB

⚠️Note: Not compatible with all Mozilla Thunderbird versions.

Limitations

Not suitable for bulk email imports and does not support MSG, PST, or OST files import in Thunderbird.

Free Import Drawbacks

Limitations of Free Thunderbird Import Solutions

Free manual Thunderbird import utilities, such as the built-in import feature and the ImportExportTools NG add-on, return multiple errors during processing and lack the versatility and scalability needed for bulk email imports in Thunderbird.

Key Issues	Where Thunderbird Free-Manual Ways Fails to Import Mailboxes in Thunderbird?
Lacks Versatility	The manual Thunderbird import method supports only a handful of email clients, such as Outlook and SeaMonkey, and works mainly with EML and MBOX files. Users cannot directly import a large number of standalone MSG, PST, or OST files into Thunderbird manually.
Risk of Data Loss	While performing the task manually, there is a risk of getting your Profile corrupted and losing emails, attachments, embedded images, and metadata while importing Mailboxes in Thunderbird. This drawback makes the manual way unreliable.
Not for Bulk & Large Mailbox Import	Free Thunderbird Import Tool can lead to repetitive and incompatible scenarios while importing large mailboxes in bulk. It consumes a lot of time, effort, and is unsuitable for organizational-level imports.
Data Integrity Issues	Importing mailboxes in Thunderbird with the free-manual methods may lead to the folder structure loss, there are chances that formatting of the data will be changed after import. Status, headers, and other associated data are not preserved well.

Direct Mailbox Import

Professional Thunderbird Importer Suite

Automated Thunderbird import software solutions to directly integrate email clients, archived, or live mailboxes with attachments, folders, contacts, and calendars on Mac and Windows.

Import IMAP email in Thunderbird

Cloud Email Services

Import any cloud-based mailbox into Thunderbird - Import from Microsoft 365, Outlook.com, Gmail, AOL Mail, Amazon WorkMail, Zoho Mail, Yandex Mail, and all IMAP-supported email services.

Import all formats in Thunderbird

File Formats

Bulk import local & orphaned mailboxes in formats such as PST, OST, MBOX, MBX, MBS, EML/ EMLX, MSG, Google Vault and Takeout files into Thunderbird with 100% data integrity.

import all email client data into thunderbird

Email Client & Profiles

Add email data from Outlook, Apple Mail, Windows Live Mail, eM Client, Postbox, and Mailbird, and import backed-up Thunderbird Profiles to a new computer with emails, contacts, and calendars preserved.

Import OST/ PST in Thunderbird

Import Outlook Data into Thunderbird

Dedicated professional solution to directly import Outlook mailboxes into Thunderbird on Mac & Windows without Outlook installation, preserving emails, contacts, and calendars with full data integrity.

Import Outlook PST to Thunderbird

Robust solution to bulk import all items from orphaned or archived PST files, emails, contacts, and calendars into Thunderbird when switching to Thunderbird with selective import and an optional repair feature.

Import PST Mailboxes to Thunderbird →

Import Outlook OST to Thunderbird

An expert-recommended importer to repair and bring locally stored, inaccessible OST files into a configured Mozilla Thunderbird Profile effortlessly with advanced filters and auto decrypt feature.

Import OST Files to Thunderbird →

✔

Both solutions support Windows & macOS with full metadata preservation.

Email Files

Import Email Files in Thunderbird

Secure, fast, and error-free Thunderbird import solutions to batch import multiple email files like MSG, EML, and MBOX files in Thunderbird at once.

.eml

EML Files

Thunderbird Import Wizard lets you upload thousands of EML/EMLX files into Thunderbird at once, directly and easily on Mac & Windows.

Import EML in Thunderbird →

.msg

MSG Files

Users can seamlessly import Microsoft Outlook MSG files in Thunderbird using the Thunderbird Import Utility when relocating data to Thunderbird.

Import MSG in Thunderbird →

.mbox

MBOX Files

Securely import of bulk MBOX data with SBF and MSF files into Thunderbird to restore email archives with email structure, attachmnets and metadata.

Import MBOX in Thunderbird→

Import From Cloud

Import
Cloud Mailboxes
in Thunderbird

Import all cloud emails into Thunderbird’s local Profile folder with attachments, inline images, signatures, formatting, and header details such as From, To, CC, BCC, Subject, Sent Date, Received Date, and Size/Time for offline anytime access.

Thunderbird email importer tools are made for all IT experts and individual users to import mailboxes from IMAP & Webmail accounts in Thunderbird.

Auto Profile Fetch

100% Integrity

All Email Source Import

Filters for Selective Import

Professional Email to Thunderbird Importer →

Trusted by IT Experts for seamless import.

Multiple Desktop Clients

Import Any Email Client into Thunderbird

Add mailboxes from all major email clients like Outlook, eM Client, Apple Mail, PostBox etc. into a single Thunderbird profile without manual exports in an organized structure with Thunderbird Importer Tools.

Outlook →

eM Client →

Apple Mail →

Postbox →

Mailbird →

Key Benefits

Why Choose Professional Solutions?

Import Mailboxes in Thunderbird Automatically with Thunderbird Import Tools for Accurate & Safe Data Handling.

Easy-to-Use

100% Secure

No Data Restrictions

Profile Auto Fetch

Selective Thunderbird Import

Advanced filter options to import selective data from mailboxes in Thunderbird, sorted by subject, recipient, sender, date range, and search terms, exclude attachment, etc. ‘

Complete Data Preservation

Preserves the extract folder structure, all inline and regular attachments in the original format, formatting, and header data such as CC, BCC, sender, subject, and signature.

Detailed Log Reports

Our professional Thunderbird Import Tools automatically generate a detailed log report, including status, time taken, and imported items, for easy auditing and tracking.

Zero Downtime Import

Skip Empty Folders

Track Import Progress

Auto Error Handling

Version & Device Support

Compatibility of Thunderbird Import Tools

Our solutions help you import mailboxes in Thunderbird are compatible with major versions of Mozilla Thunderbird and support seamless data import across Windows and macOS systems.

Import on Any Device (Windows & macOS)

Our secure Thunderbird Import Wizard supports Microsoft Windows 11, 10, 8.1, 8, 7; Windows Server 2022, 2019, 2016, 2012; and macOS X 10.8 Mountain Lion through the latest editions to access data.

Import All Email Files, Client & Service

Supports Microsoft 365, Outlook.com, Gmail, AWS, Zoho, Yandex & all IMAP services; PST, OST, MBOX, EML, MSG, Maildir; Outlook, Apple Mail; Thunderbird Profiles, local folders & USB/HDD/SSD imports etc.

Import on Any Mozilla Thunderbird Version

Compatible with all versions of Thunderbird, including Thunderbird 1.0 (2004), Thunderbird 2.0 (2007), Thunderbird 3.x, Thunderbird 5.x to 17.x, Thunderbird 115.x "Supernova" (2023), & other versions.

User Queries

Frequently Asked Questions

Get Quick Answers to FAQs Before You Import Mailboxes in Thunderbird

No, you can run unlimited imports into Thunderbird simultaneously without any file size restriction using our professional solution. However, free-manual imports may return an error with larger mailboxes.

Yes, both official and automated Thunderbird Import Tools allows you to browse to the desired location and choose the specific user or Profile to which you want to import MBOX, EML, PST, or other supported files.

With our Thunderbird import software solutions, you can import OST, PST, EML, MBOX, MBX, and MSG file formats directly into the configured Thunderbird Profile. These formats are widely used by email clients, making it easier to import data effortlessly.

Importing mailboxes into Thunderbird using the native tool or ImportExport NG may result in missing emails or incomplete imports with larger mailboxes. Use professional import solutions for 100% data preservation.

Yes, you can choose specific folders from file formats or from cloud services, email clients, or data files to make the process more efficient. This feature helps you to save time and storage to import mailboxes in Thunderbird.