# Compare Microsoft Outlook vs Thunderbird 2026 | Capterra > Unsure of what to choose? Check Capterra to compare Microsoft Outlook and Thunderbird based on pricing, features, product details, and verified reviews. Source: https://www.capterra.com/compare/227138-230507/Microsoft-Outlook-vs-Thunderbird --- # Microsoft Outlook vs Thunderbird Features and Cost Comparison Last updated April 21st, 2026 Provider data verified by our Software Research team, and reviews moderated by our Reviews Verification team.[Learn more](https://www.capterra.com/our-story/) Your comparison: Microsoft OutlookThunderbird2/4 selected [Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/)[4.5 (2,451)](https://www.capterra.com/p/227138/Microsoft-Outlook/reviews/) [Thunderbird](https://www.capterra.com/p/230507/Thunderbird/)[4.4 (159)](https://www.capterra.com/p/230507/Thunderbird/reviews/) [## Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/)[4.5 (2,451)](https://www.capterra.com/p/227138/Microsoft-Outlook/reviews/) Starting Price Contact vendor Value-for-Money 4.4 Functionality 4.5 Ease of Use 4.5 Customer Service 4.2 Reviews Sentiment Based on [2,451 reviews](#user-reviews) Positive 2,257 Neutral 149 Negative 45 [## Thunderbird](https://www.capterra.com/p/230507/Thunderbird/)[4.4 (159)](https://www.capterra.com/p/230507/Thunderbird/reviews/) Starting Price Contact vendor Value-for-Money 4.7 Functionality 4.3 Ease of Use 4.4 Customer Service 3.7 Reviews Sentiment Based on [159 reviews](#user-reviews) Positive 138 Neutral 17 Negative 4 ## Not a match? 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Fit Score methodology Our Fit Score reflects how reviewers rate a product’s performance against a set of features reviewers rate as most important. A higher score indicates the product is rated better in delivering what reviewers most care about. If the Fit Score is not shown for a specific product, that only means there are currently not enough relevant data points to develop a meaningful score. It does not indicate that the product should be excluded from further evaluation. Best for Methodology 63%Fit Missing features Feature ratings Mobile App 4.5 Email Distribution NA Inbox Management 4.6 Email Monitoring 4.5 Access Controls/Permissions NA \--%Fit Missing features Feature ratings Mobile App 5.0 Email Distribution NA Inbox Management 4.5 Email Monitoring NA Access Controls/Permissions NA User satisfaction User satisfaction 4.5 User reviews[2,451](https://www.capterra.com/p/227138/Microsoft-Outlook/reviews/) Ease of use 4.5 Functionality 4.5 Value for money 4.4 Customer support 4.2 User satisfaction 4.4 User reviews[159](https://www.capterra.com/p/230507/Thunderbird/reviews/) Ease of use 4.4 Functionality 4.3 Value for money 4.7 Customer support 3.7 Price starts from Price starts from \-- - Free version - Free trial Price starts from \-- - Free version - Free trial Best for Best for Students and professionals, businesses of all sizes, educational institutions, etc. Best for Not provided by vendor ## User reviews Pros & cons ID Isabelle D. Accountant > "The calendar funtion is especially valuable, allowing me to plan my days and weeks effectively, prioritise key tasks and ensure that all deadlines are met." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7129912) CT Cameron T. IT Service Desk Analyst > "The thing I like the least about Microsoft Outlook is that sometimes performance can be slow if you have a large inboxes, and there are frequent synchronisation..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7105977) Jhovanny A. Receptionist- New Client Liaison > "It dominates in its optimization: its Calander integration, email connections, communication, formatting, customizable layouts and even personalization." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7069640) Bongi N. Financial Manager > "The search feature does not always return the exact results I am looking for and filtering with keywords can be a bit unpleasant when it still fails to return the exact..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7138252) BA Brad A. Administrator > "The unified inbox, powerful calendar features, and seamless integration with Microsoft 365 make managing communications and scheduling both efficient and dependable." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7065002) SR Sebastien R. CAD Designer > "My least preferred function is that you don't have a automatic shit mail box, for all the scam automatically detected. And when you have the black background, you can't..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6811587) AM Annie M. Physician Assistant > "I like using Microsoft Outlook because it integrates well with my workplace, and allows for easy and fast communication with colleagues as well as individuals outside..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7056549) AD Alto D. Operations Manager > "It does not sync my picture in my email signature correctly and it is not user friendly when it comes to personalizing signatures and layouts." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7100859) Ryan M. Director > "The email organisation tools, including folders, rules, and focused inbox, help keep large volumes of emails manageable." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7113586) DE David E. Maintenance Tech > "The most frustrating aspect of Microsoft Outlook is its clunky and resource-heavy interface, which can feel overwhelming compared to more modern, streamlined email..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7142375) Sven S. Director > "The search function is effective, the performance is stable, and the close connection with Microsoft 365 applications adds a lot of value for business users." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7128929) VR Verified Reviewer IT Manager > "The mobile app is much slower than my desktop app, often experiencing major delays in receiving emails on my phone compared to the desk top." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7066549) Nikolas H. Quality Engineer > "What I really like about Microsoft Outlook is the calendar and notification settings that are available, letting teams communicate and manage schedules." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7131092) Harshul S. Senior. Technical Support Specialist for Network Operations > "Older outlook had more things we coud do then newer version so sometims I still switch between both versions The app can be slow to start on older laptops and sometimes..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7128726) VR Verified Reviewer Product owner > "Features like Focused Inbox, rules, and foldering help keep high‑priority messages visible while pushing noise out of the way." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7095888) CJ Cortney J. Paralegal > "I am frustrated that you cannot drag a PDF from an email to another window (such as Google Chrome) when this was available in previous versions of Outlook." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7064881) BD Barrett D. Night Auditor > "I enjoy that you can make folders for your emails to group them in an organized manner. Plus, I really enjoy the spam filtering because I use Outlook for work purposes..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7040904) Osvaldo B. Cinema oparator > "Sometimes it's a little slow when receiving emails. When I must receive a 2 factors authentications code, I must wait for some time to complete the operation." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7061992) VR Verified Reviewer Emergency Planner > "I like the tick function to mark when the email has been attended to and that it keeps your archived emails and if you search for it it still comes up without having to..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6844165) VR Verified Reviewer Emergency Planner > "for example we receive weather and flood warnings almost on a daily basis, sometimes multiple times a day, however I can not direct these emails straight to a 'weather..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6844165) JP Julie P. Legal counsel > "The tags are useful and allow to organize easily the emails, the possibility to add colors to the folders in the new MS Outlook is also great." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6816183) AO Alanna O. Systems Analyst Trainee > "I get a ton of emails on a daily basis and set rules so emails from specific vendors go to their own folder and don't get lost in my inbox but I've noticed it can be a..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6821178) SJ Stefanny J. Project Coordinator > "It helps you create tasks per email and send them to the Task Manager app, which allows you to distribute and categorize your work." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6846219) Ryan M. Director > "Occasionally the desktop application can be slow or lag when dealing with large mailboxes or many attachments." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7113586) Bongi N. Financial Manager > "I like the fact that Outlook is integrated with not only other Microsoft applications such as Excel and Word but that there is integration with other software like..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7138252) ID Isabelle D. Accountant > "Sometimes, long email threads in Microsoft Office can become difficult to follow, particularly when there are multiple replies in a single chain." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7129912) CT Cameron T. IT Service Desk Analyst > "The system being secure is a great benefit as it identifies spam effectively and potentially malicious emails which is great for keeping you safe." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7105977) NG Nathan G. Member Service Advocate > "At times, it can have issues getting emails as soon as they are sent, but this is likely a telecommunications issue and not indicative of a software problem." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7102543) Sven S. Director > "Outlook offers excellent organization features, including folders, rules, categories, and a very useful calendar integration." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7128929) Hameeda T. Analyst > "It can feel heavy on slower devices, and occasional sync delays happen with large mailboxes." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7122853) Hameeda T. Analyst > "Microsoft Outlook has been a dependable tool for managing emails, calendars, and tasks in one organised workspace." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7122853) OR Oliver R. Senior Designer > "The lack of ability to easily recall an email if sent to the wrong person without a little hassle to set up." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7074971) VR Verified Reviewer Product owner > "you can manage email, meetings, tasks,calender and contacts from a single interface very efficiently" [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7095888) Nikolas H. Quality Engineer > "What I do not like about Microsoft Outlook is the lack of online access and slower loading times compared to other products." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7131092) VR Verified Reviewer Account Manager > "I also like the auto delete feature that deletes emails related to events that you have accepted or rejected- helps to keep the inbox clean." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7010166) MA Mohammad A. Senior Claims Adjuster > "Also, at times it fails to open PDF files directly, so we need to download them first to view them." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7134575) RH Richelle H. Proposal Project Manager > "Schedule meetings, set reminders, schedule focus time automatically when you need to be heads, it does it all to help you be productive & make the most of your day!" [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6844821) TH Tim H. Insight Manager > "Sometimes it is difficult to find what you are looking for when you search through old emails - you search for a key word or subject line and it can bring back lots of..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6833437) Jane F. Customer Service Representative > "It’s easy to organize messages, find what I need with the search, and it works smoothly with other Microsoft apps like Teams and OneDrive" [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7088066) KA Khyan A. SDR > "Customer support is fairly passive—you don’t really engage with it unless something breaks, and when you do, it’s more self-service or documentation-based rather than..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7130322) JS Jack S. Finance Director > "Shared calendars and meeting scheduling are especially useful for coordinating with internal teams and external partners." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7084991) VS Valentin S. Sales > "Sometimes Outlook feels a bit heavy, especially when loading large inboxes or switching between accounts." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7054248) VR Verified Reviewer Emergency Planner > "It has option to have multiple inbox down the side of the main page, this is useful because you do not have to keep logging in and out of accounts to see emails coming..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6844165) RH Richelle H. Proposal Project Manager > "Sometimes it can be next to impossible to find specific items in Microsoft Outlook, but I honestly feel as though that's user error. If you create folders, you have no..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6844821) EE Emily E. CEO > "I also really like the calendar and task features; being able to schedule things, set reminders, and view everything in one place is genuinely helpful." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6839466) JH Jennifer H. Paralegal > "The space wasn't enough and I had to add more space to keep my emails all in one place. " [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7057149) Ivan A. Human Resources Generalist > "i like how it sends me followup reminders of any important meeting ,enjoy how i can collorbate within my co workers for meeting , it is free to use ." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7121086) DY Dannielle Y. Head of Family Law > "I understand you can link more than one email address to the inbox but I find that clunky and risks if someone has access to one email inbox they have access to the..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6853919) VR Verified Reviewer Case Manager > "I love that I can connect to other calendars, it keeps track of all my appointments and I can access all my other Microsoft applications!" [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7016380) JM Jordan M. HR Generalist > "Any time I want to send an email via Chrome or a similar browser version, the email never sends and it launches in a separate window." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6855643) MR Marvin R. IT Manager > "With Outlook I use everyday I am able to coordinate meetings, reply to clients on time and never miss a calendar event." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6825139) Hameeda T. Analyst > "Some advanced features are buried in menus, making them harder for new users to find." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7122853) WR William R. SR HR Operations Specialist > "It’s helpful for organizing work since you can easily schedule meetings and manage emails together." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7134543) SS Seharshah S. Freelance Graphic Designer at Fiverr > "The interface can feel a bit complex at first, especially if you only need basic email features." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7068938) EK Emre K. IT Professor > "With Outlook I can take care of client emails, organize meetings within the company and tackle my personal tasks using just one account." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6857156) Mohamed A. quality control senior engineer > "A bit slow: Sometimes the app takes too long to open or load, especially if I have many emails." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7133085) KA Khyan A. SDR > "For an SDR juggling back-to-back calls and pipeline work, that integration is a real time saver." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7130322) VR Verified Reviewer Marketing > "It can feel heavy and slow at times, especially with large inboxes, and some advanced features are buried in menus that aren’t always intuitive." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6873485) JPN Jean-Pierre N. Instructional Designer > "I find MS Outlook to be a very robust platform for organizing emails, contact management, and files." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7078507) ES Elizabeth S. Administrative Assistant > "The only thing I don't like is when composing a new email, sometimes it does not let me add an attachment until I click off of the email, and it goes to a draft and..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6627806) VR Verified Reviewer IT Manager > "Microsoft Outlook allows me to easily keep track of all the emails I receive." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7066549) PW Pixiang W. scientist > "Managing alerts across email and calendar can be confusing." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7053880) LH Luke H. Financial Advisor > "It doesn’t require a Hotmail or Outlook address to create an account, and it works for other ecosystem apps." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7059890) JS Jack S. Finance Director > "Search performance can occasionally be slow with large mail archives." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7084991) SS Seharshah S. Freelance Graphic Designer at Fiverr > "The calendar, reminders, and email rules make it easier to stay on top of multiple projects at the same time." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7068938) AM Anna M. Customer Service Agent > "Once, I tried forwarding to another inbox and I noticed they didn’t ask for enough information, so security is not the best." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7130577) Sven S. Director > "The interface is clear enough to use daily, and it helps me stay organized even when handling a high volume of messages." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7128929) VKJ Vaibhav Kant J. Student > "The interface feels a bit heavy and sometimes slow, especially on older systems." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7103573) SK Sarah K. Case Manager > "I like that I can keep all of my messages in seperate folders, I can add to my calendar and color code the events, and that I can send and receive emails efficiently" [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6764921) PL Pam L. Intake Coordinator > "At first, I didn’t fully master the tool and wasn’t very focused, mainly because I assumed it wouldn’t handle my emails properly." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7088541) GM Georgeta M. Account Payable > "It provides many features, you can organize all your mails, create folders, flag and mark the emails as per your needs." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6723710) KKZ Kaung Khant Z. Senior SDN Cloud Engineer > "I dislike its performance issues particularly with large mailboxes or when using certain features like search or calendar synchronization or internet connection is..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6651844) AD Alto D. Operations Manager > "It helps me stay on top of meetings, reminders, and deadlines without jumping between apps." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7100859) KS Kristi S. Director of Events > "I think the search feature it awful . When emails are nested it makes it so difficult to look for specific emails." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6825147) RT Rosaide T. Paralegal > "Outlook seamlessly integrates with other Microsoft Office applications like Word, Excel, and PowerPoint, making it convenient to share documents directly within emails." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6653000) Brett S. Corporate Paralegal > "I've had calendar events not enter correctly even though I did everything right mechanically, for example." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7137238) VR Verified Reviewer Civil Engineer > "I liked Microsoft Outlook's comprehensive email management, including its powerful organizational features, integrated calendar, and task management, which streamline..." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6466535) HC Hadi C. Senior Associates > "The email search function occasionally was missing some of the older messages unless I manually rebuilt the index." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___6827394) AC Andrea C. HR DIRECTOR > "We use the calendar function to stay on top of projects and that is seamless." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7047789) Hallye N. Operations Manager > "The only issues I have had with outlook is the layout can be clunky at times." [See full review](https://www.capterra.com/p/227138/Microsoft-Outlook/#Capterra___7107750) [View Reviews](https://www.capterra.com/p/227138/Microsoft-Outlook/reviews/) Leandro A. Developer > "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" [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___7054778) SA Sara A. Engineer > "The settings interface is a bit confusing; in the future 365 email accounts may have issues to works as Thunderbird does not..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___6357971) SP Stuart P. Product Manager > "I was using another free email client that would not let me use different ports for incoming and outgoing mail so when searching..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___6880981) JMV Jose Miguel V. Adjunct Professor > "Aesthetics and UI: For me, this is a big problem. While this is subjective, and the interface can be customized, when you open..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4842912) Leandro A. Developer > "Also is open source and doesn't spam you" [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___7054778) RK Robert K. drafting > "some extensions have bugs like send later" [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___6737417) JMV Jose Miguel V. Adjunct Professor > "Right now I am using Thunderbird for all my personal emails, and the client has all you need to manage successfully all your..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4842912) JF Jamie F. Lead Technician > "I always when trying to select the top email accidentally click the column header and re-order the emails which is annoying,..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___5093745) MK Matt K. Consultant > "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." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___6463718) SA Sara A. Engineer > "I don't like very much the menu, especially the settings section." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___6357971) Sunny K. Marketing Manager > "Additionally, it facilitates the management of multiple email inboxes in a single, convenient location, which can be quite..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#GetApp___6048711) Brendan B. Coach > "I have had certain performance issues that I could not explain or fix." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___6799859) Brendan B. Coach > "Free, open, power, highly customizable email client." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___6799859) VR Verified Reviewer Operations Analyst > "Lack of Cloud Integration: Thunderbird does not offer cloud integration, which may limit its usefulness for users who need to..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4565113) JM Juan M. SEO supervisor > "The intuitive user interface makes navigation a breeze, and the seamless integration with my existing email accounts was a huge..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4981089) UA Ubed A. Verification expert > "However, some users may find Thunderbird's user interface outdated compared to other modern email clients, and it may not..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4616069) DK Dev K. Design Engineer > "This is a best-of-class, open source and Free Software desktop email client that works very well with all necessary email..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___6130553) VR Verified Reviewer Operations Analyst > "Limited Mobile Support: Thunderbird does not have a dedicated mobile app, which may make it difficult for users to access their..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4565113) JMV Jose Miguel V. Adjunct Professor > "Another great addition of the last years was the "Smart folders," making your multiple account inbox easier to visit and search." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4842912) VR Verified Reviewer Operations Analyst > "Limited Customer Support: Thunderbird is an open-source project, which means that customer support is limited and users may have..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4565113) Sunny K. Marketing Manager > "I have set up multiple accounts in Thunderbird, making it convenient for me to receive emails in one place." [See full review](https://www.capterra.com/p/230507/Thunderbird/#GetApp___6048711) VR Verified Reviewer Operations Analyst > "Complex User Interface: Some users may find Thunderbird's user interface to be complex and difficult to navigate, especially if..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4565113) UA Ubed A. Verification expert > "Security and privacy: Thunderbird includes features such as encryption, phishing protection, and spam filtering that enhance..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4616069) JMV Jose Miguel V. Adjunct Professor > "This one was my first problem after I switch from Microsoft Outlook." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4842912) VR Verified Reviewer Operations Analyst > "Customizable: Thunderbird Mail is highly customizable, allowing users to personalize their email experience by choosing from a..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4565113) VR Verified Reviewer DAM Expert > "No support per email or phone." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___5001917) MK Matt K. Consultant > "It's been my go-to desktop email client for twenty years." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___6463718) MT Monica T. Project Manager > "Sometimes when there are a lot of emails coming in it gets stuck, and from time to time I need to delete some of the emails." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3808513) DM Davide M. Indie Game Developer > "I've benn using Thunderbird for several years and have had an overall positive experience with the software. While there are..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___5081958) JD Jacob D. Executive > "Namely, half the time when you repond, the reply won't be shown automatically inline (for at least several minutes)." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3513931) NP Nicolas P. IT Manager > "Very simple to use but could be configurated to have lots of stuff" [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___6805419) UA Ubed A. Verification expert > "Lack of support: Thunderbird is maintained by a small community of developers, so users may not receive prompt support or..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4616069) Austin M. Software Analyst > "I think the most impactful thing about Thunderbird is the community that uses the software, making it evolve constantly and..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___5079584) Robert M. Freelancer > "I do not know why they have separated outgoing server settings in another section from the account setting." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3763863) AR Ari R. CEO > "nice interface;- calendar built in (very well thought out);- tabs for better viewing;- mail and calendar pane in one single..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4153313) Robert M. Freelancer > "The search and filter are not very functional, and I could not find my desired result from it." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3763863) UA Ubed A. Verification expert > "Additionally, Thunderbird's ability to manage multiple email accounts from different providers, including POP, IMAP, and..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4616069) VR Verified Reviewer Operations Analyst > "However, some users may find the user interface to be complex and the performance to be slow on older computers." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4565113) VR Verified Reviewer Consultant / developer > "Thunderbird is full of features, customizable with addons and themeable." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4842831) DS David S. Tech Acct MGR > "Setting up Microsoft exchange inside of Thunderbird is difficult if you do not know what you're doing there really is no work..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3834541) UA Ubed A. Verification expert > "Thunderbird offers a wide range of add-ons and extensions that allow users to customize the program according to their needs." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4616069) VR Verified Reviewer CEO > "The calendar and all the addons can't compete with Google or other alternatives." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4580663) Sunny K. Marketing Manager > "It accommodates various mail types and allows for easy configuration." [See full review](https://www.capterra.com/p/230507/Thunderbird/#GetApp___6048711) Gonzalo M. Managing Director > "Integrates less well into Windows than some alternatives." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3712769) UA Ubed A. Verification expert > "Its free and open-source software status and cross-platform support also make it a popular choice for users across different..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4616069) TB Tanya B. Technician > "One thing i particullarly hated was the fact that the program was crashing on me from time to time." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4620389) Hugo G. Software developer and support > "Overall pleased but I'll like to see it improved" [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___6805669) JD Jacob D. Executive > "However, this add-on comes with its own bunch of issues." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3513931) JM Juan M. SEO supervisor > "Thunderbird has truly revolutionized the way I manage my inbox, and I couldn't be more impressed." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4981089) Gustavo B. Director > "It does not offer any cloud based system that might allow the software to be used away from where it was installed and..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3484995) Mohamed E. Customer Success Specialist > "I receive all the important emails on this software, it saves a lot of time and gets me notified of any available vacancies." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4635676) James C. Sales and Marketing > "Sometimes I had difficulty and slowness to do more specific searches, using keywords that were in the body of the email." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3444626) VR Verified Reviewer DAM Expert > "Of course, I like that it is open-source and free of costs. And I like Thunderbird Filelink." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___5001917) JD Jacob D. Executive > "Thunderbird, from my experience, is incredibly slow and buggy." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3513931) JM Juan M. SEO supervisor > "From the moment I started using Thunderbird, it was evident that this tool was designed with productivity in mind." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4981089) AR Ari R. CEO > "RAM memory is another con that I'd point out." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4153313) SS Shashi S. Student > "It has fewer features than outlook but as a University student, the software works fine for me because I don't need all those..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4473755) Robert M. Freelancer > "Maybe it is my mistake, So at least it is not user-friendly enough to learn and work with." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3763863) UA Ubed A. Verification expert > "Overall, Mozilla Thunderbird is a popular email client that provides a range of features and customization options." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4616069) DP Darian P. Team Lead of Internal Tools > "We don't use the calendar functionality because it constantly would not work for our users." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3021391) GS Grant S. Head of Sales > "All the features but leaner, more stable & faster." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___6165374) VR Verified Reviewer Senior system engineer > "Most generic features are commercialized which will tend other users to use different mail clients" [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3431281) JMV Jose Miguel V. Adjunct Professor > "Since I have been using Thunderbird, I never regret my switch from Outlook." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4842912) SP Santosh P. Digital Marketer > "Iwas needing cloud access to mails and my webmail was not cutting it." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3198853) SP Shane P. Security system engineer > "I like the fact that Thunderbird was free and worked for the most part." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___6008627) AL Ad L. Director > "It has a rather childish menu bar layout in black and white." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3024426) Petter K. Parish Manager > "I think the main thing I can say that I like about Thunderbird is that it is free." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___6193707) Bill B. President > "Another issue I have is with the built-in calendar. " [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3258266) ML Mark L. Owner > "A great way to use an email system that is very low cost and has the features and benfits you will need for many small business..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3639522) SP Shawn P. Owner > "The UI is incredibly outdated." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3394046) Stanley M. System Administrator > "I love the new modern look that ships with Thunderbird and the support for dark theme." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4169265) James C. Sales and Marketing > "I've had problems with the manager simply stopping working and having to restart." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3444626) VR Verified Reviewer Senior system engineer > "I think if you want to sync your gmail,hotmail, yahoo mail with your local client, Thunderbird is one such mail client which..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3431281) AL Ad L. Director > "The opening of tabs is something i personally do not like." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3024426) JJ Jeet J. Founder & CEO > "Moreover, it also supports adding SMTP mail which is really helpful." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4053362) Teya B. Teacher: Digital Illustration > "I find the interface very, very dated." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3150330) AR Ari R. CEO > "I was delighted to start using this app when a coworker recommended it to me because I'd been trying to find something that was..." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___4153313) AL Ad L. Director > "Don't like the visual." [See full review](https://www.capterra.com/p/230507/Thunderbird/#Capterra___3024426) [View Reviews](https://www.capterra.com/p/230507/Thunderbird/reviews/) ## User interface [Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/) 4.54 (2,451) [Thunderbird](https://www.capterra.com/p/230507/Thunderbird/) 4.41 (159) ### Features Do these products fit your needs? Prioritize real-user-identified key features according to your needs to find your best fit. \--% Fit vs \--% Fit Access Controls/Permissions 207 Important Activity Dashboard 150 Important AI Copilot 120 Important Microsoft Outlook 11/47 - Access Controls/Permissions - Activity Dashboard - AI Copilot - Alerts/Notifications - API - Archiving & Retention - Autoresponders - Campaign Analytics - Campaign Management - Canned Responses - Chat/Messaging - Collaboration Tools - Contact Management - Customer Segmentation - Customizable Fields - Customizable Forms - Customizable Templates - Data Recovery - Drag & Drop - Email Distribution - Email Marketing - Email Monitoring - Email Templates - Email Tracking - Generative AI - Inbox Management - Mobile App - Multiple User Accounts - Prioritization - Process/Workflow Automation - Queue Management - Real-Time Analytics - Real-Time Monitoring - Real-Time Reporting - Reporting/Analytics - Response Management - Routing - Search/Filter - Shared Inboxes - Signature Management - Social Media Integration - Spam Blocker - Support Ticket Management - Tagging - Third-Party Integrations - Whitelisting/Blacklisting - Workflow Management [See all features](https://www.capterra.com/p/227138/Microsoft-Outlook/#features) Thunderbird Top features 12/47 - Access Controls/Permissions - Activity Dashboard - AI Copilot - Alerts/Notifications - API - Archiving & Retention - Autoresponders - Campaign Analytics - Campaign Management - Canned Responses - Chat/Messaging - Collaboration Tools - Contact Management - Customer Segmentation - Customizable Fields - Customizable Forms - Customizable Templates - Data Recovery - Drag & Drop - Email Distribution - Email Marketing - Email Monitoring - Email Templates - Email Tracking - Generative AI - Inbox Management - Mobile App - Multiple User Accounts - Prioritization - Process/Workflow Automation - Queue Management - Real-Time Analytics - Real-Time Monitoring - Real-Time Reporting - Reporting/Analytics - Response Management - Routing - Search/Filter - Shared Inboxes - Signature Management - Social Media Integration - Spam Blocker - Support Ticket Management - Tagging - Third-Party Integrations - Whitelisting/Blacklisting - Workflow Management [See all features](https://www.capterra.com/p/230507/Thunderbird/#features) ### Recognition Microsoft Outlook is recognized as a top-rated tool in 3 Capterra Shortlist reports Thunderbird is recognized as a top-rated tool in 3 Capterra Shortlist reports Best Value Email ManagementSoftware (2026)  ### Deployment & support Microsoft Outlook Deployment - Cloud, SaaS, Web-Based - Desktop Mac - Desktop Windows - Desktop Linux - On-Premise Windows - On-Premise Linux - Desktop Chromebook - Mobile Android - Mobile iPhone - Mobile iPad Support - Email/Help Desk - FAQs/Forum - Knowledge Base - Phone Support - 24/7 (Live rep) - Chat Training - In Person - Live Online - Webinars - Documentation - Videos Thunderbird Deployment - Cloud, SaaS, Web-Based - Desktop Mac - Desktop Windows - Desktop Linux - On-Premise Windows - On-Premise Linux - Desktop Chromebook - Mobile Android - Mobile iPhone - Mobile iPad Support - Email/Help Desk - FAQs/Forum - Knowledge Base - Phone Support - 24/7 (Live rep) - Chat Training - In Person - Live Online - Webinars - Documentation - Videos ### Company Details Microsoft Outlook - By Microsoft - Located in United States - Founded in 1975 Thunderbird - By Mozilla - Located in United States - Founded in ## Popular Comparisons [Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/)[4.54 (2,451)](https://www.capterra.com/p/227138/Microsoft-Outlook/reviews/) vs [Gmail](https://www.capterra.com/p/202338/Gmail/)[4.81 (13,397)](https://www.capterra.com/p/202338/Gmail/reviews/) Contact vendor for pricing Price $0 4.5 Features 4.7 4.5 Ease of Use 4.8 [View full comparison](https://www.capterra.com/compare/202338-227138/Gmail-vs-Microsoft-Outlook) [Thunderbird](https://www.capterra.com/p/230507/Thunderbird/)[4.41 (159)](https://www.capterra.com/p/230507/Thunderbird/reviews/) vs [Gmail](https://www.capterra.com/p/202338/Gmail/)[4.81 (13,397)](https://www.capterra.com/p/202338/Gmail/reviews/) $0 Price $0 4.3 Features 4.7 4.4 Ease of Use 4.8 [View full comparison](https://www.capterra.com/compare/202338-230507/Gmail-vs-Thunderbird) [Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/)[4.54 (2,451)](https://www.capterra.com/p/227138/Microsoft-Outlook/reviews/) vs [Google Workspace](https://www.capterra.com/p/247901/Google-Workspace/)[4.70 (17,549)](https://www.capterra.com/p/247901/Google-Workspace/reviews/) Contact vendor for pricing Price $7/month 4.5 Features 4.6 4.5 Ease of Use 4.6 [View full comparison](https://www.capterra.com/compare/227138-247901/Microsoft-Outlook-vs-Google-Workspace) [Thunderbird](https://www.capterra.com/p/230507/Thunderbird/)[4.41 (159)](https://www.capterra.com/p/230507/Thunderbird/reviews/) vs [Google Workspace](https://www.capterra.com/p/247901/Google-Workspace/)[4.70 (17,549)](https://www.capterra.com/p/247901/Google-Workspace/reviews/) $0 Price $7/month 4.3 Features 4.6 4.4 Ease of Use 4.6 [View full comparison](https://www.capterra.com/compare/230507-247901/Thunderbird-vs-Google-Workspace) [Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/)[4.54 (2,451)](https://www.capterra.com/p/227138/Microsoft-Outlook/reviews/) vs [Microsoft 365](https://www.capterra.com/p/227157/Microsoft-365/)[4.65 (14,071)](https://www.capterra.com/p/227157/Microsoft-365/reviews/) Contact vendor for pricing Price $6/month 4.5 Features 4.6 4.5 Ease of Use 4.5 [View full comparison](https://www.capterra.com/compare/227138-227157/Microsoft-Outlook-vs-Microsoft-365) [Thunderbird](https://www.capterra.com/p/230507/Thunderbird/)[4.41 (159)](https://www.capterra.com/p/230507/Thunderbird/reviews/) vs [Microsoft 365](https://www.capterra.com/p/227157/Microsoft-365/)[4.65 (14,071)](https://www.capterra.com/p/227157/Microsoft-365/reviews/) $0 Price $6/month 4.3 Features 4.6 4.4 Ease of Use 4.5 [View full comparison](https://www.capterra.com/compare/227157-230507/Microsoft-365-vs-Thunderbird) [Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/)[4.54 (2,451)](https://www.capterra.com/p/227138/Microsoft-Outlook/reviews/) vs [Yahoo Mail](https://www.capterra.com/p/266980/Yahoo-Mail/)[4.23 (850)](https://www.capterra.com/p/266980/Yahoo-Mail/reviews/) Contact vendor for pricing Price Contact vendor for pricing 4.5 Features 4.1 4.5 Ease of Use 4.4 [View full comparison](https://www.capterra.com/compare/227138-266980/Microsoft-Outlook-vs-Yahoo-Mail) [Thunderbird](https://www.capterra.com/p/230507/Thunderbird/)[4.41 (159)](https://www.capterra.com/p/230507/Thunderbird/reviews/) vs [Yahoo Mail](https://www.capterra.com/p/266980/Yahoo-Mail/)[4.23 (850)](https://www.capterra.com/p/266980/Yahoo-Mail/reviews/) $0 Price Contact vendor for pricing 4.3 Features 4.1 4.4 Ease of Use 4.4 [View full comparison](https://www.capterra.com/compare/230507-266980/Thunderbird-vs-Yahoo-Mail) [Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/)[4.54 (2,451)](https://www.capterra.com/p/227138/Microsoft-Outlook/reviews/) vs [Mailchimp](https://www.capterra.com/p/110228/MailChimp/)[4.48 (17,599)](https://www.capterra.com/p/110228/MailChimp/reviews/) Contact vendor for pricing Price $13/month 4.5 Features 4.4 4.5 Ease of Use 4.4 [View full comparison](https://www.capterra.com/compare/110228-227138/MailChimp-vs-Microsoft-Outlook) [Thunderbird](https://www.capterra.com/p/230507/Thunderbird/)[4.41 (159)](https://www.capterra.com/p/230507/Thunderbird/reviews/) vs [Mailchimp](https://www.capterra.com/p/110228/MailChimp/)[4.48 (17,599)](https://www.capterra.com/p/110228/MailChimp/reviews/) $0 Price $13/month 4.3 Features 4.4 4.4 Ease of Use 4.4 [View full comparison](https://www.capterra.com/compare/110228-230507/MailChimp-vs-Thunderbird) [Microsoft Outlook](https://www.capterra.com/p/227138/Microsoft-Outlook/)[4.54 (2,451)](https://www.capterra.com/p/227138/Microsoft-Outlook/reviews/) vs [Brevo](https://www.capterra.com/p/132996/brevo/)[4.62 (3,439)](https://www.capterra.com/p/132996/brevo/reviews/) Contact vendor for pricing Price $9/month 4.5 Features 4.5 4.5 Ease of Use 4.6 [View full comparison](https://www.capterra.com/compare/132996-227138/brevo-vs-Microsoft-Outlook) [Thunderbird](https://www.capterra.com/p/230507/Thunderbird/)[4.41 (159)](https://www.capterra.com/p/230507/Thunderbird/reviews/) vs [Brevo](https://www.capterra.com/p/132996/brevo/)[4.62 (3,439)](https://www.capterra.com/p/132996/brevo/reviews/) $0 Price $9/month 4.3 Features 4.5 4.4 Ease of Use 4.6 [View full comparison](https://www.capterra.com/compare/132996-230507/brevo-vs-Thunderbird)