Thunderbird Alternatives for Windows

There are many alternatives to Thunderbird for Windows if you are looking for a replacement. The best Windows alternative is Claws Mail, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Thunderbird and many of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Thunderbird are Betterbird, SeaMonkey, eM Client and Mailbird.

filter to find the best alternatives

Thunderbird alternatives are mainly Email Clients, but if you're looking for Calendar Apps or Group Chat Apps you can filter on that. Other popular filters include Linux, Open Source, iPhone, Windows + Open Source, EU, Windows and Free. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Thunderbird.
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Alternatives list

  1. Mailbird icon
    Sponsored

    Streamline your email experience by managing multiple accounts, integrating apps like Slack and Google Calendar, and using AI-driven features like drafting and spam prevention. Customize your workspace with themes, notifications, and tools for improved productivity and a modern interface.

    64 Mailbird alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
  2. Claws Mail icon
     106 likes

    Email and news client on GTK+ foundation featuring quick performance, extensible plugins, secure protocols, advanced filtering, strong folder and contact management, lightweight design, powerful search, customizable interface, multi-language support, and encryption.

    62 Claws Mail alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Windows
    • Linux
    • BSD
     
    |
    8
    51
    Comments about Claws Mail as an Alternative to Thunderbird
    Top Positive Comment
    Jonathan DUMONT
    9

    Despite the style, Claws is super fast and allow you to programs it with Perl and Python which is great for marketing automation.

    Top Negative Comment
    Guest
    20

    No HTML compose is the only reason I don't switch to it. We're not in 1980 anymore.

    Review by a new / low-activity user.
    SViN
    2

    I think most people are using gmail accounts or outlook accounts to access their emails. Claws supports Oauth2 to access said accounts but the implementation, is a complete PAIN.

    I can only realistically recommend something like this if your email provider is not forcing Oauth2.

    I would like for the devs to get to work into making the experience of setting up an account with oauth as painless as thunderbird.

    3 of 8 comments
    Claws Mail icon
    Claws Mail icon
    • Most users think Claws Mail is a great Thunderbird alternative.

    • Claws Mail is Free and Open SourceThunderbird is also Free and Open Source
    • Claws Mail is LightweightThunderbird is not according to our users
  3. Betterbird icon
     73 likes

    Betterbird, a soft fork of Mozilla Thunderbird, improves user experience with advanced features, bug fixes, security patches, and multi-row descriptions similar to Outlook. Compatible with multiple platforms and can be used alongside Thunderbird, sharing the same profile.

    28 Betterbird alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • Chocolatey
     
    |
    6
    17
    Comments about Betterbird as an Alternative to Thunderbird
    Top Positive Comment
    Sam Lander
    3

    Betterbird does everything that Thunderbird does (it's a soft fork), while improving bugs and features.

    Because it's a soft fork, it retains the security implementations of Thunderbird.

    Thunderbird actually implements many of the bug fixes created by Betterbird, but at a much slower pace.

    Shoji VR
    Positive
    1

    has more features than thunderbird

    drummer_nrg
    Positive
    1

    Betterbird is actively updated by a previous Thunderbird developer and is a fully compatible fork of Thunderbird which fixes some outstanding bugs. My add-ons like keepassxc-mail work fine!

    3 of 6 comments
    Betterbird icon
    Betterbird icon
    • Almost everyone thinks Betterbird is a great Thunderbird alternative.

    • Betterbird is Free and Open SourceThunderbird is also Free and Open Source
    • Betterbird is LightweightThunderbird is not according to our users
  4. SeaMonkey icon
     241 likes

    Web-browser, advanced e-mail, newsgroup and feed client, IRC chat, and HTML editing in one application. Itis built on the open source Mozilla Gecko engine, the same code which underlies Thunderbird and is the base for the Firefox browser.

    184 SeaMonkey alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    • PortableApps.com
     
    |
    4
    43
    Comments about SeaMonkey as an Alternative to Thunderbird
    Guest
    Positive
    21

    SeaMonkey is both a WEB BROWSER and EMAIL CLIENT. It's the successor of Mozilla Application Suite or Netscape Communicator, resp. Further it includes also a news client program, an HTML editor (SeaMonkey Composer) and an IRC client (ChatZilla).

    Review by a new / low-activity user.
    apostolfaliagas
    Positive
    15

    It has all of Thunderbird's features and many more.

    Guest
    Negative
    0

    Unfortunately doesn't support synchronization with CardDAV address books.

    Review by a new / low-activity user.
    3 of 4 comments
    SeaMonkey icon
    SeaMonkey icon
    • Some users think SeaMonkey is a great Thunderbird alternative, some don't.

    • SeaMonkey is Free and Open SourceThunderbird is also Free and Open Source
    • SeaMonkey is LightweightThunderbird is not according to our users
  5. eM Client icon
     233 likes

    Looking for a full-featured email client with a modern and easy-to-use interface? Look no further than eM Client. Rated 3 out of 5, eM Client is a popular alternative to Thunderbird, offering all the features you need to manage your email, calendar, tasks, contacts, notes, and chat all in one place.

    With support for IMAP, calendar integration, and multiple accounts, eM Client is the perfect choice for users who want a robust email client that can handle all their needs. Whether you're using Windows or Mac, eM Client is the most popular proprietary alternative to Thunderbird, offering a powerful and flexible solution for managing your email and staying organized. Give it a try today and see why so many users are making the switch to eM Client.

    61 eM Client alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Android
     
    |
    13
    74
    Comments about eM Client as an Alternative to Thunderbird
    Top Positive Comment
    3psilon
    2

    A good Windows alternative if you use 1-2 mailboxes or don't mind paying.

    Top Negative Comment
    LinuxDoge
    2

    doesnt support Linux, isnt open source, not configurable enough

    Shoji VR
    Negative
    0

    its freemium and no linux support

    3 of 13 comments
    eM Client icon
    eM Client icon
    • Most users think eM Client is a great Thunderbird alternative.

    • eM Client is Freemium and ProprietaryThunderbird is Free and Open Source
  6. Mailbird icon
     307 likes

    Streamline your email experience by managing multiple accounts, integrating apps like Slack and Google Calendar, and using AI-driven features like drafting and spam prevention. Customize your workspace with themes, notifications, and tools for improved productivity and a modern interface.

    64 Mailbird alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
     
    |
    5
    61
    Comments about Mailbird as an Alternative to Thunderbird
    Top Positive Comment
    Ian James
    -1

    Clean interface, much faster than Thunderbird. One touch unsubcribe is a nice touch and adding new accounts is a breeze

    Top Negative Comment
    Guest
    11

    Mailbird is missing most of the features which Thunderbird offers, like encryption and plugins

    Review by a new / low-activity user.
    Shoji VR
    Negative
    0

    Free limited to 1 mail account only, also no support for linux, android, ios.

    3 of 5 comments
    Mailbird icon
    Mailbird icon
    • Some users think Mailbird is a great Thunderbird alternative, some don't.

    • Mailbird is Freemium and ProprietaryThunderbird is Free and Open Source
  7. Streamline emails, calendars, contacts, and task management with a smart inbox prioritizing critical messages. Includes calendar scheduling, third-party app integration like Facebook, Dropbox, and Trello, and support for Microsoft Exchange, Outlook.com, and Gmail, ensuring efficient task and email handling.

    126 Microsoft Outlook alternatives

    Cost / License

    • Paid
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Apple Watch
    • Android Wear
     
    |
    6
    84
    Comments about Microsoft Outlook as an Alternative to Thunderbird
    Top Positive Comment
    Eyji
    5

    As a Firefox user, I have tried to love Thunderbird but it just can't compete with Outlook, IMHO.

    Top Negative Comment
    LinuxDoge
    4

    Not open source, not privacy-focused, no Linux support

    Shoji VR
    Negative
    0

    no linux support, not portable, not free, and now its new version is electron app only

    3 of 6 comments
    Microsoft Outlook icon
    Microsoft Outlook icon
    • Some users think Microsoft Outlook is a great Thunderbird alternative, some don't.

    • Microsoft Outlook is Paid and ProprietaryThunderbird is Free and Open Source
  8. Mailspring icon
     114 likes

    Boost your productivity and send better email with Mailspring, a beautiful, fast email client for Mac, Windows, and Linux. Mailspring is free to use and an optional pro version adds read receipts, send later, reminders and more.

    43 Mailspring alternatives

    Cost / License

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Arch Linux
    • Fedora
    • Ubuntu
     
    |
    8
    29
    Comments about Mailspring as an Alternative to Thunderbird
    Top Positive Comment
    3psilon
    1

    Great alternative, especially for casual users. Simple, streamlined UI, feels fresh.

    Top Negative Comment
    Guest
    61

    Need to create an account on a third-party company to access your email.

    Review by a new / low-activity user.
    Shoji VR
    Negative
    0

    paywall, not available for android/ios, not portable

    3 of 8 comments
    Mailspring icon
    Mailspring icon
    • Most users think Mailspring is a great Thunderbird alternative.

    • Mailspring is Freemium and Open SourceThunderbird is Free and Open Source
  9. Spark Mail icon
     138 likes

    E-mail app with all the great features: swipes (long/short), snooze, add (multiple) attachments from the cloud, support for various e-mail services and more.

    62 Spark Mail alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • iPad
    • Apple Watch
     
    |
    2
    19
    Comments about Spark Mail as an Alternative to Thunderbird
    folkomaton
    Positive
    0

    Free, simple, reliable, easy to manage multiple accounts, fair amount of customization, synchronisation, templates

    Review by a new / low-activity user.
    rmpbklyn
    Negative
    -3

    no sorting, dont show allmail for gmail

    Spark Mail icon
    Spark Mail icon
    • Most users think Spark Mail is a great Thunderbird alternative.

    • Spark Mail is Freemium and ProprietaryThunderbird is Free and Open Source
  10. Sylpheed icon
     62 likes

    Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).

    42 Sylpheed alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    • PortableApps.com
     
    |
    1
    17
    Comments about Sylpheed as an Alternative to Thunderbird
    Guest
    Negative
    3

    It doesn't encrypt password storage and doesn't have Master Password function

    Review by a new / low-activity user.
    Sylpheed icon
    Sylpheed icon
    • Most users think Sylpheed is a great Thunderbird alternative.

    • Sylpheed is Free and Open SourceThunderbird is also Free and Open Source
    • Sylpheed is LightweightThunderbird is not according to our users
  11. BlueMail icon
     33 likes

    BlueMail is a modern, mobile first, powerful Email management tool with a sleek design, unified inbox and support for all your accounts: IMAP,Exchange,POP3.

    32 BlueMail alternatives

    Cost / License

    • Free Personal
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Apple Watch
     
    |
    3
    27
    Comments about BlueMail as an Alternative to Thunderbird
    Guest
    Negative
    25

    bluemail pushes all your mail into their clud making it insecure

    Review by a new / low-activity user.
    Guest
    Positive
    0

    It works on Android, but is not so powerfull.

    Review by a new / low-activity user.
    Guest
    Positive
    -2

    clear, easy to use lots of flexibility

    Review by a new / low-activity user.
    BlueMail icon
    BlueMail icon
    • Most users think BlueMail is a great Thunderbird alternative.

    • BlueMail is Free Personal and ProprietaryThunderbird is Free and Open Source
    • BlueMail is LightweightThunderbird is not according to our users
  12. Mutt icon
     68 likes

    Mutt is a small but very powerful text-based mail client for Unix operating systems. Some of its features are: color support, message threading, MIME support (including RFC2047 support for encoded headers), PGP/MIME (RFC2015), various features to support mailing lists, including...

    51 Mutt alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Xfce
     
    |
    2
    24
    Comments about Mutt as an Alternative to Thunderbird
    Guest
    Negative
    17

    Thunderbird users want a GUI mail application. Mutt is a command line mail application. They are both good and both popular, but very much apples and oranges.

    Review by a new / low-activity user.
    Guest
    Negative
    0

    Mutt's a great email client for your terminal, not a GUI app like Thunderbird.

    Review by a new / low-activity user.
    Mutt icon
    Mutt icon
    • Most users think Mutt is a great Thunderbird alternative.

    • Mutt is Free and Open SourceThunderbird is also Free and Open Source
  13. Canary Mail icon
     28 likes

    Canary can write your emails, prioritize what needs attention, silence spam & much more. Say hello to your Inbox Copilot!

    62 Canary Mail alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Apple Watch
     
12 of 48 Thunderbird alternatives