# Thunderbird Reviews 2026. Verified Reviews, Pros & Cons | Capterra > 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: https://www.capterra.com/p/230507/Thunderbird/reviews --- 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 March 13th, 2026 # Reviews of Thunderbird Ease of use 4.3 Customer Service 3.7 ## Pros and Cons in Reviews 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 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 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 JV Jose Miguel V Adjunct ProfessorEducation Management, 1,001 - 5,000 employeesUsed the software for: 1-2 years. “Aesthetics and UI: For me, this is a big problem. While this is subjective, and the interface can be customized, when you open Thunderbird you are looking at a user interface that has not been modernized according to the times.“ June 9, 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 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 JV Jose Miguel V Adjunct ProfessorEducation Management, 1,001 - 5,000 employeesUsed the software for: 1-2 years. “Right now I am using Thunderbird for all my personal emails, and the client has all you need to manage successfully all your personal data flow.“ June 9, 2023 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 ## 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 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 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 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 Brendan B. Coach E-Learning Used the software for: 2+ years ### "Lightweight and powerful." May 4, 2025 5.0 I have used it for email daily. It offers all the features you might expect from a fairly lightweight email client. Pros Free, open, power, highly customizable email client. It outperforms every other email client I have used. Cons I have had certain performance issues that I could not explain or fix. These were resolved after I did a clean install of Windows (for other reasons). 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 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 VR Verified Reviewer Senior lecturer Higher Education Used the software for: 2+ years ### "Complete control over your mails" August 5, 2021 5.0 Pros It is completely configurable through add-ons. If you use Firefox, you will find the same environmemt and interface. I have several language thesaurus add-ons, so not to make any typo whatever the language I'm using. It is free!! Also if many mail software are free, having Mozilla foundation behind gives you the security of future developments, and that it will never change to paid mode... It is so easy to move your mails and whatever linked to it, from one workstation to another (i.e. when you change your laptop..)... So to replicate your environment and have consistency of your mails (you need to se up IMAP accounts). It is hence also very easy to have backups of your mails, just in case. Cons Nothing really, I'm happy with Thunderbird and don't consider to change it in the future... What I would say, is that maybe I don't use it at its best, for the extensive number of add-ons existing, as I look at them only when I need a certain function. 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 JZ Jeffrey Z. Founder Farming Used the software for: 2+ years ### "Best Free Desktop Email Program" December 8, 2022 5.0 I use it on a daily basis to send dozens of emails. It works very well, & I love the fact that PDF's open within the program Pros It's feature rich, open source, & funded by donations. It gets updated very regularly with new features, etc. Cons My biggest gripe is the fact that you can't easily switch between signatures. & that to use HTML signatures, you need to save them as a file Review Source Robert M. Freelancer Computer Software Used the software for: 1-2 years ### "Free and useful " August 17, 2022 4.0 I like it. It is smooth and very fast. Pros It is working very well. When you add your email address, it sets up everything for you. There are a lot of extensions that you can add functionalities to Thunderbird. As it has a lot of users, it is bugless Cons I do not know why they have separated outgoing server settings in another section from the account setting. The search and filter are not very functional, and I could not find my desired result from it. Maybe it is my mistake, So at least it is not user-friendly enough to learn and work with. Review Source Ahmed Samy E. Digital Marketing Consultant Marketing and Advertising Used the software for: 2+ years ### "Good free email management software " May 5, 2022 4.0 Pros Thunderbird is totally free as it's developed by Mozilla, so you won't pay any subscription fees. You can manage multiple email inboxes from one interface and open each email in a separate tab within the software interface. Cons I think they should develop the right to left (RTL) editing function to be fully compatible with RTL Languages, when I write a message in Arabic I notice that dots at the end of phrases are reversed and moved to the beginning, the Arabic phrases are also messed up when writing English word within them. Review Source EK Erik K. Sr. Manager of L&D Internet Used the software for: 1-2 years ### "A great replacement for Outlook" July 29, 2021 5.0 I made the switch to Thunderbird when my outlook experience became too frustrating with lost emails and sent mail stuck in outbox oblivion. Since switching I've had nothing but great experience with Thunderbird. Pros I love that Thunderbird is reliable. Having used Outlook for over a decade, I was a bit hesitant to switch, but am very glad I did. I had numerous problems in the past with outlook which are no longer an issue since I've switched to Thunderbird. Thunderbird works the way I expect it to, and I never lose mail or have items stuck in my outbox. I highly recommend! Cons The thing I liked least about Thunderbird initially was the layout and aesthetic, but that quickly disappeared as I became familiar with where everything is located and the icons for everything. Now I would say the layout is very simple and less complicated than Outlook. Review Source PE Paul E. Manager Retail Used the software for: 2+ years ### "A Good Old-fashioned Email Application" August 15, 2021 5.0 Basically it just offers us a really simple, low maintenance, secure system for keeping track of our customer's e-mails. Pros The hint to what I like about it is in the title, yes it's been around for a long time but when something works as well as Thunderbird does you don't need to change! From a security point of view I like the fact that it isn't cloud based with all our business customer's personal mails and details stored on some other corporation's servers. It's a breeze to setup new accounts, and their are various extensions that allow you to unleash more power from the application. Cons There isn't really anything that I don't like about this software. We have been using for probably 12 years since we opened our business and have never had an issue. Review Source SP Santosh P. Digital Marketer Marketing and Advertising Used the software for: 2+ years ### "Robust email client. " November 12, 2021 5.0 One of the most well rounded email clients and beats Outlook by a mile and then some! Pros Open source, Mozilla-made, feature rich. What's not to like! I used Mozila Thunderbird for a good 7 years before moving to Protonmail. Too many features to love to list. Ability to integrate with Protonmail is a plus as well. Cons The fact that this is a local client. Iwas needing cloud access to mails and my webmail was not cutting it. Also, setting up encryption was a bit tedious. Hence, had to move to Protonmail. Switched from [Gmail](https://www.capterra.com/p/202338/Gmail/) Privacy issues. Review Source SP Shawn P. Owner Online Media Used the software for: 2+ years ### "Great free email client, lacks a slick UI but it's very customizable " March 3, 2022 4.0 While it's ugly, it's still my go-to email application when I'm not using the web. It has every single feature I want from an email client. Pros I like that it's free and open source, and it's incredibly customizable. There's a ton of community extensions that are available to be installed with minimal setup. Cons The UI is incredibly outdated. It looks like 20 year old software. Review Source Petter K. Parish Manager Civic & Social Organization Used the software for: Less than 6 months ### "Not the best e-mail software" March 6, 2024 3.0 Pros I think the main thing I can say that I like about Thunderbird is that it is free. That's probably the only positive thing I have to say. Cons I haven't really worked with any email software that have been as clunky and hard to use as Thunderbird. Would certainly not recommend! 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. PST import was bit tricky Review Source Similar Products Featured ## Related categories [Email Management](https://www.capterra.com/email-management-software/)