MozillaThunderbird139.0.2 PC Software
Introduction
MozillaThunderbird 139.0.2 is an open-source, free email client developed by the Mozilla Foundation. Mozilla Thunderbird, a very powerful and secure email client, is characterized as one of the most advanced email clients that offer incredible flexibility, security, and customizability. With the latest release, Thunderbird 139.0.2 has brought a number of enhancements, including an increase in email security, optimized speed, and features that simplify email management.

In any case, Thunderbird is an excellent solution for any level email user, whether they are a professional managing multiple email accounts or a casual user in search of a hassle-free email client. With our piece of writing, you will explore the choice of Thunderbird 139.0.2, go through the features, installation as well as the system requirements.
Description
Mozilla Thunderbird is a cross-platform email client that supports Windows, macOS, and Linux operating systems. Thunderbird follows a standalone design that involves the storing of emails on local storage, which in turn enables offline access and allows for better privacy retention. It supports multiple email protocols, namely IMAP, POP3, and SMTP, which are used by the majority of email providers; this is why you can connect many email accounts to it and own a “global” mailbox.
Moreover, Thunderbird involves:
- Bundled calendar (Lightning extension officiated)
- Android contacts
- RSS feed aggregator
- Flexible look with compatible add-ons

- Robust spam filter
- Built-in encryption through OpenPGP support
The latest version that the makers have presented to followers is branded as 139.0.2. Security and performance have been optimized in this release of Mozilla Thunderbird, therefore resulting in a more satisfying and efficient user experience.
Overview
Thunderbird 139.0.2, a minor update, is titled so because it enhances the earlier updates found. By working away in the background, improvements that are technological-related are kept intact. Moreover, considerable side aspects can be pointed out:
- Security updates – Updates regularly make protection against phishing schemes and malware more solid.
- Performance tuning helps in loading and ensures smooth operation.
- Enhanced Add-on support easily integrate with release extensions.
- Upgraded search capability allows emails to be located appropriately and speedily.
Thunderbird remains a popular replacement for Microsoft Outlook and other proprietary email clients, particularly among people who value their privacy and would like to create their own space.
Software Features
1. Email Management
- Integration with Gmail, Yahoo, and Outlook accounts.
- Divided email viewing into tabs to ease sorting and categorization.
- Use of advanced filters and the management of folders.
2. Calendar and Tasks (Lightning Add-on)
- Side by side calendar presentation for timely scheduling.
- Task creation to-do list followed by task management with.
- Reminders for event completion.
- Integrated third-party DAV or online calendar found at an address of Origin default user agent.
3. Contact Management
- You can build a Rolodex containing the details for every contact with an address book.
- LDAP directories can be used by firms.
- The contact list can be added or exported from other email applications employing this feature.
4. Customization & Extensions
- A variety of diverse themes to change the appearance of Thunderbird.
- Modules provide additional tools for increasing your productivity (e.g., Angola).
5. Security & Privacy
- Junk mail filtration as a proactive measure rather than reviewing emails personally.
- Use of OpenPGP enables cryptographic email security measures.
- Prophylactic protection against phishing and malware incidents.
6. Search & Organization
- The built-in quick filter toolbar is a way to sort the email.
- The menu displays customized search suggestions via available filters.
- Options for labelling and archiving the emails.
7. Cross-Platform Support
- Accessibility on Windows, and Linux.
- Enabling sync setting while setting passwords on each device is possible.
How to Install Mozilla Thunderbird 139.0.2
Step 1: Download Thunderbird
Visit the official Mozilla Thunderbird site by clicking on the given link: https://www.thunderbird.net.
Click “Download” when you see the option to get the latest version (139.0.2).
Step 2: Run the Installer

Windows:
- Launch and open the setup file .exe you downloaded earlier.
- Proceed as normal as you go through each screen.
- Choose to modify the installation or keep the default settings, depending on your preference.
- Click “Install” to initiate the process and wait until it’s done completely.
macOS:
- Double-press the .dmg (Digital Media Gateway) file to open it.
- Drag the Thunderbird down to the Applications folder.
Linux:
- The default way of installing Thunderbird in most distributions is to use package managers like
sudo apt install thunderbird
(for Ubuntu). - Alternatively, to install the setup, you have to download and extract the files.
Step 3: Set Up Your Email Account
- Once the installation is complete, run Thunderbird.
- Click “Email” in the setup wizard.
- Input your name, email, and password.
- The server will be automatically detected (IMAP or POP3) as per the type of account you hold in Thunderbird.
- After all necessary fields are filled in, click “Done” to finish the setup process.
Step 4: Customize Thunderbird (Optional)
- Add-ons from Tools > Add-ons.
- Modify themes through Preferences > General > Themes.
- Contact calendar configuration if it is mandatory.
System Requirements
In order for Mozilla Thunderbird 139.0.2 to run without any issues, your system should meet the following required security specifications:
Windows
- OS: Microsoft operating system Windows 10 and later will suffice.

- Processor: The slowest allowed processor is 1 GHz, which one needs for running Mozilla Thunderbird.
- RAM: recommended to be 4 GB in size to accelerate the application’s performance.
- Storage: Get at least 200 MB free storage to save your emails and other documents.
- Internet connection: This feature helps to sync your emails online and offline as you wish.
macOS
- OS: Instead of this, a modern macOS version of 10.15 (Catalina) or newer is needed.
- Processor: Intel or Apple chips (M1/M2) also work in macOS processors, whether an Apple Silicon (M1/M2) or an Intel.
- RAM: The preferable size of RAM to use is 4 GB, which is larger than suggested and is highly recommended.
- Storage: Free up 200 MB of storage over time for that user data or the running applications.
Linux
- OS: The up-to-date Linux distributions (Ubuntu 20.04+, Fedora and more) is latest OSs that should be installed.
- Processor: For the Firefox right installation checking, a processor above 1 GHz is useful.
- RAM: For less consumption of the system resources, users can go with 2 GB RAM, but for better system performance, one should use 4 GB RAM.
- Storage: For the Thunderbird to operate correctly, the used disk must have a space of 200 MB.