Thunderbird Alternatives for Windows

There are many alternatives to Thunderbird for Windows if you are looking for a replacement. The best Windows alternative is Betterbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Thunderbird and loads of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Thunderbird are Microsoft Outlook, SeaMonkey, eM Client and Spark Mail.

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Most Thunderbird alternatives are Email Clients, but you can also narrow the list to Calendar Apps or Contact Managers. Other popular filters are iPhone, Linux, Open Source, Android and Windows. You can also filter for EU-based alternatives if you prefer software from the European Union.
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Alternatives
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Alternatives list

  1. Mailbird icon
    Sponsored
     308 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.

    More about Mailbird on AlternativeTo81 Mailbird alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Since

    • Since 2013

    Platforms

    • Windows
    • Mac
    • US flagUnited States
    Mailbird screenshot 1
    Good alternative?
     
  2. Betterbird icon
     96 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.

    45 Betterbird alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Since

    • Since 2021

    Platforms

    • Windows
    • Mac
    • Linux
    • Flathub
    • Chocolatey
    Good alternative?
     
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    7
  3. 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.

    157 Microsoft Outlook alternatives

    Cost / License

    • Paid
    • Proprietary

    Application type

    Since

    • Since 1996

    Platforms

    • Windows
    • Mac
    • Online
    • Android
    • iPhone
    • iPad
    • Android Tablet
    • Apple Watch
    • Android Wear
    Good alternative?
     
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    6
  4. SeaMonkey icon
     251 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.

    198 SeaMonkey alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Since

    • Since 2009

    Platforms

    • Windows
    • Mac
    • Linux
    • BSD
    • PortableApps.com
    Good alternative?
     
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    4
  5. eM Client icon
     237 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.

    77 eM Client alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Since

    • Since 2009

    Platforms

    • Windows
    • Mac
    • Android
    Good alternative?
     
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    13
  6. Spark Mail icon
     144 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.

    85 Spark Mail alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Since

    • Since 2016

    Platforms

    • Windows
    • Mac
    • Android
    • iPhone
    • iPad
    • Apple Watch
    Good alternative?
     
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    2
  7. Mailspring icon
     118 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.

    Cost / License

    Application type

    Since

    • Since 2017

    Platforms

    • Windows
    • Mac
    • Linux
    • Ubuntu
    • Arch Linux
    • Fedora
    Good alternative?
     
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    8
  8. Pelton icon
     17 likes

    Free, open-source client for Windows, macOS, and Linux, offering local email storage and search online or offline, privacy-focused with no telemetry or third-party servers, IMAP and SMTP support, intuitive interface, and multiple account support.

    23 Pelton alternatives

    Cost / License

    Application type

    Since

    • Since 2026

    Platforms

    • Windows
    • Mac
    • Linux
    Good alternative?
     
  9. Claws Mail icon
     107 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.

    75 Claws Mail alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Since

    • Since 2009

    Platforms

    • Windows
    • Linux
    • BSD
    Good alternative?
     
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    9
  10. Aerion icon
     13 likes

    Modern open-source email client supporting unified inbox, IMAP/SMTP, Gmail and Outlook with OAuth2, conversation threading, rich text TipTap composing, CardDAV contact sync, tracking removal, dark mode, color themes, vim-style shortcuts, and a detachable window.

    56 Aerion alternatives

    Cost / License

    Application type

    Since

    • Since 2026

    Platforms

    • Windows
    • Mac
    • Linux
    • Flathub
    • Flatpak
    Good alternative?
     
  11. Canary Mail icon
     29 likes

    Secure email app for Mac, iPhone, Android and Windows with AI Copilot, PGP encryption, read receipts and one unified inbox.

    81 Canary Mail alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Since

    • Since 2016

    Platforms

    • Windows
    • Mac
    • Android
    • iPhone
    • iPad
    • Apple Watch
    Good alternative?
     
  12. BlueMail icon
     34 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.

    48 BlueMail alternatives

    Cost / License

    • Free Personal
    • Proprietary

    Application type

    Since

    • Since 2016

    Platforms

    • Windows
    • Mac
    • Linux
    • Chrome OS
    • Android
    • iPhone
    • iPad
    • Android Tablet
    • Apple Watch
    • HUAWEI AppGallery
    Good alternative?
     
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    3
  13. Meron icon
     6 likes

    Fast/secure email client with kanban and chat views.

    Cost / License

    Application type

    Since

    • New

    Platforms

    • Windows
    • Mac
    • Linux
    • Ubuntu
    • Android
    • iPhone
    • iPad
    • F-Droid
    • Flathub
    • Snapcraft
    • Flatpak
    Good alternative?
     
12 of 59 Thunderbird alternatives