--- title: "Thunderbird Reviews 2026. Verified Reviews, Pros & Cons | Capterra" description: "Is Thunderbird the right Email Management solution for you? Explore 160 verified user reviews from people in industries like yours to make a confident choice." source_url: "https://www.capterra.com/p/230507/Thunderbird/reviews/" page_type: "reviews" language: "en" --- Thunderbird 4.4 (160) [View alternatives](https://www.capterra.com/p/230507/Thunderbird/alternatives/) Provider data verified by our Software Research team, and reviews moderated by our Reviews Verification team. [Learn more](https://www.capterra.com/our-story/) * * * Last updated August 20th, 2026 # Reviews of Thunderbird Ease of use 4.3 Customer Service 3.7 ## Pros and Cons in Reviews Leandro A DeveloperComputer Software, 2 - 10 employeesUsed the software for: 1-2 years. “I use it as my main email client , both for personal use and for work , it feels comfortable .Big plus that they don't spam you“ December 2, 2025 RK Robert K draftingCivil Engineering, 2 - 10 employeesUsed the software for: More than 2 years. “some extensions have bugs like send later“ March 13, 2025 SP Stuart P Product ManagerInformation Technology and Services, 11 - 50 employeesUsed the software for: Less than 6 months. “I was using another free email client that would not let me use different ports for incoming and outgoing mail so when searching for another one thunderbird looked great and has been very good so far.“ August 23, 2025 JF Jamie F Lead TechnicianInformation Technology and Services, Self-employedUsed the software for: More than 2 years. “I always when trying to select the top email accidentally click the column header and re-order the emails which is annoying, would be nice if you could lock it.“ October 25, 2023 Leandro A DeveloperComputer Software, 2 - 10 employeesUsed the software for: 1-2 years. “Also is open source and doesn't spam you“ December 2, 2025 SA Sara A EngineerInformation Technology and Services, 2 - 10 employeesUsed the software for: 1-2 years. “The settings interface is a bit confusing; in the future 365 email accounts may have issues to works as Thunderbird does not belong to Microsoft.“ June 25, 2024 Sunny K Marketing ManagerInformation Technology and Services, 11 - 50 employeesUsed the software for: 1-2 years. “Additionally, it facilitates the management of multiple email inboxes in a single, convenient location, which can be quite intriguing.“ November 28, 2023 Brendan B CoachE-Learning, 2 - 10 employeesUsed the software for: More than 2 years. “I have had certain performance issues that I could not explain or fix.“ May 4, 2025 ## Showing most helpful reviews Showing 1-25 of 160 Reviews Sort by: Most Helpful Rating Company Size Reviewer's Role Length of Use Frequency of Use Leandro A. Developer Computer Software Used the software for: 1-2 years ### "Thunderbird Review" December 2, 2025 5.0 I use it as my main email client , both for personal use and for work , it feels comfortable .Big plus that they don't spam you Pros It offers great security , access and conectivity . Fast , light weight email client .Also is open source and doesn't spam you Cons The Ui it's a little outdated . Sometimes it is difficult to find the way to access some of its features. Switched from [Gmail](https://www.capterra.com/p/202338/Gmail/) The send you advertisements all the time .It's really annoying Review Source JF Jeffrey F. Owner Health, Wellness and Fitness Used the software for: 2+ years ### "Solid email service especially to integrate with Protonmail Bridge" May 2, 2026 5.0 Really great! I also like that it has in the settings some options for extensions that will increase its capabilities Pros My favorite thing about Thunderbird is this it works with Protonmail which is my preferred email service Cons I guess I would like it to have some a few more options for color themes though it probably does have some and I just didn't know where to look Switched from [Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/) Because Microsoft Outlook is way too complicated and can get frustrating and annoying and it takes up a lot of space on my computer Review Source IG Ireshyn G. Scientist Research Used the software for: 1-2 years ### "Not the best email client" January 7, 2025 3.0 I opt to use other email clients over this as it is feature poor. Pros The product is free to use and relatively easy to setup Cons Many basic features from other email clients are missing and/or hidden. Review Source Hugo G. Software developer and support E-Learning Used the software for: 2+ years ### "Good email client, but could be improved" May 9, 2025 4.0 Overall pleased but I'll like to see it improved Pros If the best OSS email clients, it fast and almost without bug Cons Sometimes buggy, slow to open large email of big conversation with a lot of destinations, and conversation history is not always good (the thread construction I mean, being able to read send email and received in a unified way as in GMail) Alternatives considered [Gmail](https://www.capterra.com/p/202338/Gmail/) Reason for choosing Thunderbird Use your osn smtp/imap accounts, and it's free Review Source SP Stuart P. Product Manager Information Technology and Services Used the software for: Less than 6 months ### "Amazing for a free product" August 23, 2025 5.0 I was using another free email client that would not let me use different ports for incoming and outgoing mail so when searching for another one thunderbird looked great and has been very good so far. Pros I suppose I like the combination of its quality and price-point, as I use a free version. It is a lot more robust than other free software Cons Some of the styling is a little bit lacking but I need to be fair and say I've not tried to look for settings to change it so maybe it's better to say default styling is poor. Switched from [eM Client](https://www.capterra.com/p/160239/eM-Client/) Setting up config between incoming and outgoing mail was fiddly Review Source NP Nicolas P. IT Manager Information Technology and Services Used the software for: 2+ years ### "A great solution dor maange your mail" May 9, 2025 4.0 Using thunderbird since several years in pro and personal use. Pros Very simple to use but could be configurated to have lots of stuff Cons As any other "plugable" software, be sure that any plugin don't create issue Alternatives considered [Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/) Reason for choosing Thunderbird Thunderbird is under free version and very light compared to Outlook Review Source Stanley M. System Administrator Information Technology and Services Used the software for: 2+ years ### "The Best Opensource Mail Client." November 7, 2022 5.0 I love the new modern look that ships with Thunderbird and the support for dark theme. Pros Am an opensource lover and the fact that thunderbird has been my mail client for years. Cons The email configuration can be made simple that what is being currently offered for custom domains. Alternatives considered [Mailbird](https://www.capterra.com/p/160517/Mailbird/) Reason for choosing Thunderbird Open License and free to install and use meaning if you try it and it doesn't work for you you can always opt to change without any incurred cost. Switched from [Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/) Cost of License. Review Source Austin M. Software Analyst Pharmaceuticals Used the software for: 2+ years ### "Thunderbird, the GO-TO Lightweight mailing client" October 17, 2023 5.0 We started using Thunderbird as an alternative for our outlook clients, performing even better during the days, and making it a go-to software for our new installations. Pros I think the most impactful thing about Thunderbird is the community that uses the software, making it evolve constantly and performing better. It is awesomely easy to set up and makes yourself feel really at ease, with a simple UI and plugin enhancements that make it even better. Cons I think Cloud support could be more extensive, to make Thunderbird evolve to the next level, the team should really make it an objective inside the application. Switched from [Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/) We made the switch because of the problems and security issues, we resolved them with plugins + firewalls, features that could be only be accomplished with Thunderbird. Review Source SS Sven S. Prokurist Food Production Used the software for: 2+ years ### "Reliable, Well-Organized, and Easy to Use Email Client" April 1, 2026 5.0 The calendar integration works smoothly, and features like filters, folders, and tags make daily email management efficient. Thunderbird is lightweight but still powerful enough for professional use. Pros One of Thunderbird’s biggest strengths is how easy it is to handle several email accounts at once. The integrated calendar, contact management, tags, and filter tools make staying organized effortless, even in a busy workday. It performs reliably, respects user privacy, and allows a wide range of personalization through themes and add-ons, which makes it suitable for both personal and professional communication setups. Cons The only drawbacks I’ve noticed are that the interface design looks a bit outdated compared to modern email clients, and certain advanced functions require additional add-ons to be installed. Occasionally, updates may change how some extensions work, which can require a bit of time to readjust or reconfigure. Still, these are minor issues compared to the stability and usability Thunderbird offers. Switched from [Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/) Because Microsoft Outlook got to expensive. Review Source Osvaldo B. Cinema operator Entertainment Used the software for: 2+ years ### "Free and easy to use email manager." January 28, 2026 4.0 In general, my experience has been good, and I like this email manager tool. I never had any kind of trouble. Pros I use Thunderbird every day at work with my colleagues. We use it to manage all our work emails in a fully secure environment. Thunderbird is easy to use and offers valuable customer support. I appreciate the calendar integration and all the other features. Cons I would like to see a little more friendly interface, with the possibility to change the colours inside the pages, to make them easier to read. Review Source RK Robert K. drafting Civil Engineering Used the software for: 2+ years ### "Great for multiple emails" March 13, 2025 5.0 Overall very impressed with it and love that i can use it for al my emails Pros Love that it can put all my email's in one place Cons some extensions have bugs like send later Review Source TC Tommaso C. Head of Brand and Innovation Design Used the software for: 2+ years ### "A robust all standard email management software for connoisseurs" October 2, 2024 4.0 A software that is still actual and works well. Multi option and multi accounts management. Maybe too multi when you have a lot of accounts to manage. Pros Total control on your email in every possible configuration Cons as much as this is also its strength, it suffers from a traditional ux. Although Thunderbird looks neither old, nor is it sloppy in its graphic details, if you could open Netscape 3 mail, you would still recognize the origins of this software today. Review Source UA Ubed A. Verification expert Computer & Network Security Used the software for: 2+ years ### ""Mozilla Thunderbird: A Powerful and Customizable Email Client for Managing Your Inbox"" February 23, 2023 5.0 Overall, Mozilla Thunderbird is a popular email client that provides a range of features and customization options. Many users appreciate its security and privacy features, such as encryption, phishing protection, and spam filtering. Additionally, Thunderbird's ability to manage multiple email accounts from different providers, including POP, IMAP, and Exchange, is also well-received by users.However, some users may find Thunderbird's user interface outdated compared to other modern email clients, and it may not integrate well with other services like calendars or task management tools. Thunderbird's lack of real-time syncing and limited storage capabilities may also be a concern for some users.Despite these limitations, many users find Mozilla Thunderbird to be a reliable and efficient email client that meets their needs. Its free and open-source software status and cross-platform support also make it a popular choice for users across different operating systems. Ultimately, whether Thunderbird is the right email client for a particular user depends on their specific needs and preferences.By Ubed Ahmed Pros Pros:Free and open-source software: Mozilla Thunderbird is free to download and use, and it is open-source software. This means that users can view and modify the source code, and even contribute to the development of the program.Cross-platform support: Thunderbird is available for Windows, Mac, and Linux, so users can use it on almost any computer.Customizable: Thunderbird offers a wide range of add-ons and extensions that allow users to customize the program according to their needs. Users can add features, change the interface, and more.Security and privacy: Thunderbird includes features such as encryption, phishing protection, and spam filtering that enhance users' security and privacy.Multiple account support: Thunderbird can manage multiple email accounts from different providers, including POP, IMAP, and Exchange. Cons Cons:No real-time syncing: Thunderbird does not offer real-time syncing between multiple devices, so users need to manually sync their email and data.Limited integration with other services: Thunderbird is primarily an email client and does not integrate well with other services like calendars or task management tools.Outdated user interface: Thunderbird's user interface can feel outdated compared to other modern email clients.Lack of support: Thunderbird is maintained by a small community of developers, so users may not receive prompt support or updates.Storage limitations: Thunderbird's storage capabilities are limited, so users may experience performance issues if they store a large amount of data. Review Source JM Juan M. SEO supervisor Marketing and Advertising Used the software for: 1-2 years ### "Great email accoutn manager" August 17, 2023 5.0 I am thrilled to share my exceptional experience with Thunderbird, As a professional constantly inundated with emails, finding an effective and efficient solution has been a game-changer for me. Thunderbird has truly revolutionized the way I manage my inbox, and I couldn't be more impressed.From the moment I started using Thunderbird, it was evident that this tool was designed with productivity in mind. The intuitive user interface makes navigation a breeze, and the seamless integration with my existing email accounts was a huge plus. Setting up filters, labels, and automated responses has never been so straightforward. Pros Allows you to integrate and manage several accounts in one single space Cons Can't wait to get the mobile app to have all my accounts always with me Switched from [Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/) No, my boss did it Review Source MK Matt K. Consultant Management Consulting Used the software for: 2+ years ### "So much nicer to use than Outlook!" August 28, 2024 5.0 I probably use less than 20% of what it can do, but that's all I need. Multiple email accounts, smart message handling, a decent filter system, easy spam controls, it all just works. Even when I've had ten or more email addresses to manage for different clients, it's been up to the job and easy to use. Pros It's been my go-to desktop email client for twenty years. Cons Adding in calendar and task list to compete with Outlook was unnecessary. Review Source Gustavo B. Director Marketing and Advertising Used the software for: 2+ years ### "Great alternative to Outlook" April 23, 2022 5.0 Thunderbird is a great management system for emails, it is easy to use, and represent a great alternative for any company looking to reduce in terms of licenses. Pros Open Source ( free to use) Good Email Management System Easy to install and deploy Cons It does not offer any cloud based system that might allow the software to be used away from where it was installed and configured. Reason for choosing Thunderbird Thunderbird is open source and can handle the workload just as good as Microsoft Outlook. Review Source SL Stephen L. Senior Lecturer Higher Education Used the software for: 2+ years ### "Excellent Desktop Email Client" September 30, 2021 4.0 Thunderbird is excellent desktop client for users that require advanced control over their email. Pros These days many email clients are entirely online which has advantages but it also comes with some disadvantages. You need to be online to view and respond to email and you need to trust that your email provider will store your email for you and never prevent you from accessing it. Thunderbird resolves these issues because it runs locally on your machine. Connectivity is only required when sending and downloading email. You email is archived locally and the size of the archive is only limited by your available hard drive space. Thunderbird also integrates well with providers like Gmail. I use it to keep a local copy of my Gmail. Thunderbird is free, open source and comes with many add-on which often additional functionality. Cons Thunderbird updates often break existing add-ons and there is a delay until these add-ones are updated to work with the latest version. Review Source VR Verified Reviewer GM Telecommunications Used the software for: 2+ years ### "For a mail programme it doesn't get more standard and trustworthy then this." July 8, 2022 5.0 Pros It handles my mail without any real issues and has been doing so for many years so ...it even handles Very big mailboxes easily. Some extensions needed for some basic things even but all work pretty much perfectly. Cons Recently upgrades have broken plugins more often which is annoying. Review Source Rocio C. Customer Support Electrical/Electronic Manufacturing Used the software for: 1-2 years ### "Free to use and highly customizable" August 26, 2022 4.0 For many years I used Thunderbird as my primary email server for business purposes. It is a very complete tool and free to use but I currently use other more up-to-date tools. Pros It allows you to customize many aspects of the inbox, as well as the templates and privacy and security options. Cons Its use is less widespread than that of other email servers. Review Source SP Shane P. Security system engineer Computer Networking Used the software for: 6-12 months ### "Thunderbird email software review" November 3, 2023 2.0 Overall Thunderbird was an okay software if you're just starting out but as your company grows I suggest investing in something better. Pros I like the fact that Thunderbird was free and worked for the most part. Cons I dislike the fact that Thunderbird was more of a home use and not a business quality email client. Review Source MP Marcus P. Director Marketing and Advertising Used the software for: 2+ years ### "Excellent & Free Email Application" August 2, 2021 5.0 Our overall experience has been very positive, if you are looking for a trustworthy and free solution that can basically cater to all intermediate needs, then Mozilla Thunderbird is definitely the solution of choice. Pros Setting up new email accounts with various providers is a seamlessly simple task. Quick configurations work very well and there are more advanced settings for more complicated setups. As a free to use program it has all the features and functionality that you would require. Adding Google Calendars and setting up meetings can be integrated and performed within seconds. Cons Some more advanced features such as automated reply suggestions as well as further security configurations can enhance the capabilities of the program. Other than that, it is a great product. Review Source DK Dev K. Design Engineer Electrical/Electronic Manufacturing Used the software for: 2+ years ### "Best Desktop Email Application" January 16, 2024 4.0 This is probably the email you want if you want desktop email. It'll be around forever and it'll always work. Pros This is a best-of-class, open source and Free Software desktop email client that works very well with all necessary email protocols. Cons It is clunky and the UI less polished or trendy than some other applications - for me this is a good thing. Reason for choosing Thunderbird Free Open software, it'll be around forever and won't disappear or make arbitrary design changes. Review Source RAS Rachelle Anne S. Administrative Staff Consumer Goods Used the software for: 1-2 years ### "Thunderbird Review" June 22, 2024 5.0 Pros We use this to email different departments within our company. This set up can avoid sending messages to wrong accounts outside the company. Cons I have no any problem in using this tool. Review Source AL Ad L. Director Information Technology and Services Used the software for: 2+ years ### "good alternative email client if you do not want to use Microsoft Outlook both paid or free" August 17, 2021 2.0 Fast, no costs. Good alternative if you want to use a mail client instead of the more intuitive webmail portals. Pros its pretty fast in performance. The layout/visual is easy to understand since it is basic email layout (pretty similar as gmail) Cons Since it is open source you are bound to support from other users. The opening of tabs is something i personally do not like. Maybe others users are liking it more than i do. Don't like the visual. It has a rather childish menu bar layout in black and white. Review Source MM Murtaza M. Assistant Manager IT Restaurants Used the software for: 2+ years ### "Simply the best eMail App" December 10, 2021 5.0 Pros It is very simple and easy to use free email software. I was unable to install Windows Mail on a Windows 8 laptop so I opted for Thunderbird since then I have never ever urged or thought about going back to Outlook or Mail. Everything is so simple in thunderbird, there are a bunch of addons available. My fav addon Quickfolder which makes thunderbird more visualized and mails easily to find. Cons 1\. It's not available on iPhone. 2. 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