How to Import Mailbox from IncrediMail to Thunderbird? Know Here!

Anuraag Singh | Last Modified: April 9th, 2021 | Conversion

The news of shutting down of IncrediMail had created panic among its users. This was sudden and unexpected for them. So, now they want a practical, usable, and free email client just like IncrediMail. In the league of the best alternative for IncrediMail – Thunderbird has emerged as the best candidate. But the main issue is how to import mailbox from IncrediMail to Thunderbird account. Because neither IncrediMail nor Thunderbird offers any feature that can get this job done directly.

User Query #1. Transfer email data from IncrediMail data to Thunderbird

User Query #2. Import to Thunderbird from IncrediMail

To fix this issue we have come up with an easy-to-use solution that has a straightforward approach i.e. SysTools IncrediMail to MBOX Converter. Users had to perform two tasks for it.

Download Tool Purchase Now

  1. Convert IncrediMail data into MBOX
  2. Import resulting files into thunderbird

The below section of the blog includes the entire process. But before moving on that we will find why Thunderbird is the best alternative for the IncrediMail email clients.

Why Thunderbird is the best alternative for IncrediMail?

  • Thunderbird is an absolutely free email client just like IncrediMail. It is a product by Mozilla which is known as the landmark for its services, safety, security, and credibility.
  • Anyone can install and configure it without having any specific technical knowledge. It is widely available for both Windows and Mac OS.
  • Thunderbird has a separate fan base because of its user-friendly yet attractive interface. It accommodates multiple accounts on the same Thunderbird profile.
  • With better management, fast search, filters, tags, Thunderbird is a reliable email service provider. It runs on high-security protection that offers a spam filter, firewalls, and antivirus.

These advantageous features motivate users to import IncrediMail mailboxes to Thunderbird application.

NOTE – IncrediMail Email Importer tool does not require its client or configure an account on the system. So users do not have to worry about the functionality of the IncrediMail application.

TASK I – Convert IncrediMail data into MBOX (Four Steps)

Follow these steps to perform the conversion using the tool.

main screen

  • Add IncrediMail data files or folders.

add file

(It will automatically detect data files on the utility panel)

  • Preview the files and select the desired files & folder to convert.


Tip – User gets various options to preview the IncrediMail files. All the major attributes will be displayed on the preview panel.

  • Choose MBOX as your file format. Click on Browse and provide destination location to save the converted MBOX files.

mbox export type

That’s it,

Now you have to import these MBOX files into your Thunderbird account.

TASK II – Import MBOX to thunderbird

1. Launch configure Thunderbird application.

2. Click on the three horizontal lines on the top right corner of the homepage.

Follow Tools >> Import option as shown in the image.

3. In the next window, you have to choose the Import MBOX file option from the given list.

4. Choose recently generated MBOX files with their subdirectory. Click on the Ok button.

5. Navigate to the system location (select the location you chose while saving the converted files).

6. After selecting the files, simply click on the OK button to import MBOX mailbox to Thunderbird account.

Characteristics to Convert IncrediMail Data into Thunderbird

You can easily access the converted files into the Thunderbird platform without any issue by using IncrediMail to Thunderbird converter. In the section below, we have highlighted some of the features that will benefit you in various other scenarios.

  • Effective for batch / bulk conversion.
  • Provide functionality for IMM, IML, IM, DB files to MBOX format.
  • Export each data item including emails, address book, contacts, etc.
  • Import IncrediMail along with embedded attachments.
  • Keep Meta properties intact as well as data integrity.
  • Do not need an IncrediMail client for conversion.
  • Compatible with all versions of Windows including 10, 8, 8.1, 7, and others.

Have a look: View .imm files without IncrediMail Application to read IncrediMail Storage


After the shutdown of IncrediMail, the user expressed their concern for their email data. No user can afford to lose their crucial email files. Understanding this requirement we have come up with the best solution that keeps the data integrity in check. We hope now you have learned the complete process of how to import mailbox from IncrediMail to Thunderbird in the easiest approach.