Free Microsoft Outlook Alternatives for Windows

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

filter to find the best alternatives

Microsoft Outlook alternatives are mainly Email Clients, but if you're looking for Calendar Apps or Todo List Managers you can filter on that. Other popular filters include Linux, Open Source, EU, Windows + Free, Android, Free + Calendar and Windows + Open Source. 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 Microsoft Outlook.
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Alternatives list

  1. Thunderbird icon

    Thunderbird

     2539 likes

    Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.

    86 Thunderbird alternatives

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • BSD
    • AppImageHub
    • Snapcraft
    • Flathub
    • PortableApps.com
    • F-Droid
    • Haiku
    • Homebrew
    • Chocolatey
    Thunderbird screenshot 1
     
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    15
    192
    Comments about Thunderbird as an Alternative to Microsoft Outlook
    Comment summary: Thunderbird is praised for being a strong open-source alternative to Microsoft Outlook, with numerous extensions enhancing its functionality. Users value its seamless compatibility across different Linux distributions and appreciate the built-in calendar, though some desire further improvements in calendar integration. Many find Thunderbird intuitive and easier to use than Outlook, though a minority consider its interface complicated. Security and customization are notable advantages.
    Top Positive Comment
    John Fastman
    12

    Despite its age, Thunderbird remains the most fully featured email client out there. Various add-ons can extend its functionality, it (now) has a built in calendar and, unlike Outlook, it's free, open source and respects your privacy.

    Top Negative Comment
    Guest
    15

    The interface is just impossible for many people to use.

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

    I remember when I first used Thunderbird, many years ago, as I'd rather have a single interface for productivity. But the interface through me off and I never got on with the editor. Coming back to it now, it's fresher and smoother. Absolutely love it. In my opinion this is the only true alternative to Outlook. Then there's the bonus of extensions to further enhance it. Though, I'd like to see further improvements to the calendar integration.

    3 of 15 comments
    Microsoft Outlook Icon
    Thunderbird icon

    • Most users think Thunderbird is a great Microsoft Outlook alternative.

    • Thunderbird is the most popular Windows, Android, Mac & Linux alternative to Microsoft Outlook.

    • Thunderbird is the most popular Open Source & free alternative to Microsoft Outlook.

    • Thunderbird is Free and Open SourceMicrosoft Outlook is Paid and Proprietary
    • Thunderbird is Customizable and Privacy focusedMicrosoft Outlook is not according to our users
  2. eM Client icon

    eM Client

     233 likes

    eM Client is a full featured e-mail client with a modern and easy to use interface. eM Client also offers calendar, tasks, contacts, notes and chat.

    61 eM Client alternatives

    Cost / License

    • Freemium (Pay once)
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Android
    eM Client: Inbox view
     
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    5
    51
    Comments about eM Client as an Alternative to Microsoft Outlook
    Top Positive Comment
    hellih
    0

    It is not very overcomplicated! Very simple, but functional design. therefore also very easy to set up and use.

    Guest
    Positive
    0

    Supports 365 Shared Mailboxes.

    Review by a new / low-activity user.
    Guest
    Positive
    1

    One of the only fully integrated email and calendar solutions that supports Office365, Exchange, Outlook, Gmail, GSuite, POP, and IMAP. Good performance and usability.

    Review by a new / low-activity user.
    3 of 5 comments
    Microsoft Outlook Icon
    eM Client icon

    • Most users think eM Client is a great Microsoft Outlook alternative.

    • eM Client is Freemium and ProprietaryMicrosoft Outlook is Paid and Proprietary
  4. Mailbird icon

    Mailbird

     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 (Pay once or Subscription)
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    Mailbird screenshot 1
     
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    2
    53
    Comments about Mailbird as an Alternative to Microsoft Outlook
    Guest
    Negative
    -1

    Not enough functionality. No smart attachment feature, no quick sort by address or flags or attachments etc. Not really a business email client

    Review by a new / low-activity user.
    Guest
    Negative
    -10

    These are email clients not replacements for outlook

    Review by a new / low-activity user.
    Microsoft Outlook Icon
    Mailbird icon

    • Most users think Mailbird is a great Microsoft Outlook alternative.

    • Mailbird is Freemium and ProprietaryMicrosoft Outlook is Paid and Proprietary
    • Mailbird is CustomizableMicrosoft Outlook is not according to our users
  5. Ad
    Screenshot
    Mailbird icon
    Mailbird

    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,...

    https://www.getmailbird.com
    Learn More
  6. Betterbird icon

    Betterbird

     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
    Betterbird screenshot 1
     
  7. Spark Mail icon

    Spark Mail

     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 (Subscription)
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • iPad
    • Apple Watch
    Spark Mail screenshot 1
     
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    1
    17
    Comments about Spark Mail as an Alternative to Microsoft Outlook
    Guest
    Positive
    -1

    Nice client. Great UI. It does lack Caldav support unfortunately.

    Review by a new / low-activity user.
    Microsoft Outlook Icon
    Spark Mail icon

    • Most users think Spark Mail is a great Microsoft Outlook alternative.

    • Spark Mail is the most popular iPhone & iPad alternative to Microsoft Outlook.

    • Spark Mail is Freemium and ProprietaryMicrosoft Outlook is Paid and Proprietary
  8. Mailspring icon

    Mailspring

     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

    • Freemium (Subscription)
    • Open Source (GPL-3.0)

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Arch Linux
    • Fedora
    • Ubuntu
    Clean design with integrated search and swipe gestures
     
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    3
    21
    Comments about Mailspring as an Alternative to Microsoft Outlook
    Paul
    Positive
    0

    Since Thunderbird is still bloated and overcomplicated for me on Linux, I'm using Mailspring for the moment. It's good, the interface is nice and it has plenty of features.

    Guest
    Positive
    0

    Beautiful theme options with custom designed themes available. I tried thunderbird a few times but always came back to mailspring. I LOVE the "views" feature that shows you how many times an email was opened and if it was forwarded by the recipient!

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

    Speed of work, good connection to the mail server, speed search.

    Review by a new / low-activity user.
    Microsoft Outlook Icon
    Mailspring icon

    • Most users think Mailspring is a great Microsoft Outlook alternative.

    • Mailspring is Freemium and Open SourceMicrosoft Outlook is Paid and Proprietary
    • Mailspring is CustomizableMicrosoft Outlook is not according to our users
  10. Claws Mail icon

    Claws Mail

     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 types

    Platforms

    • Windows
    • Linux
    • BSD
    The main window
     
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    1
    Comments about Claws Mail as an Alternative to Microsoft Outlook
    Guest
    Negative
    -2

    Claws Mail is email only, does not have many of the features of Outlook. Displaying HTML mail is sketchy at best.

    Review by a new / low-activity user.
    Microsoft Outlook Icon
    Claws Mail icon

    • Some users think Claws Mail is a great Microsoft Outlook alternative, some don't.

    • Claws Mail is Free and Open SourceMicrosoft Outlook is Paid and Proprietary
    • Claws Mail is Lightweight, Customizable and Privacy focusedMicrosoft Outlook is not according to our users
  11. Canary Mail icon

    Canary Mail

     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 (Pay once or Subscription)
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Apple Watch
    Canary Mail screenshot 1
     
  12. EssentialPIM icon

    EssentialPIM

     75 likes

    The powerful, full-featured Personal Information Manager for Windows offering Email, Synchronization, Portability, Network support, Android and iOS versions.

    175 EssentialPIM alternatives

    Cost / License

    • Freemium (Pay once or Subscription)
    • Proprietary

    Application types

    Platforms

    • Windows
    • Android
    • iPhone
    EssentialPIM screenshot 1
     
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    1
    7
    Comments about EssentialPIM as an Alternative to Microsoft Outlook
    Guest
    Positive
    -1

    Tricky to configure. Does not speak MAPI, but many Cloudservices. I was not successful to synchronize OwnCloud

    Review by a new / low-activity user.
    Microsoft Outlook Icon
    EssentialPIM icon

    • Most users think EssentialPIM is a great Microsoft Outlook alternative.

    • EssentialPIM is Freemium and ProprietaryMicrosoft Outlook is Paid and Proprietary
  13. BlueMail icon

    BlueMail

     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
    BlueMail screenshot 1
    BlueMail screenshot 2
    BlueMail screenshot 3
     
    |
    1
    8
    Comments about BlueMail as an Alternative to Microsoft Outlook
    rstefan
    Positive
    -1

    much lighter, faster more responsive than outlook both in windows and Android. vivid and vibrant colors and ergonomic menu

    Microsoft Outlook Icon
    BlueMail icon

    • Most users think BlueMail is a great Microsoft Outlook alternative.

    • BlueMail is Free Personal and ProprietaryMicrosoft Outlook is Paid and Proprietary
    • BlueMail is LightweightMicrosoft Outlook is not according to our users
  14. Sylpheed icon

    Sylpheed

     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
    Main screen
     
  15. TypeApp icon

    TypeApp

     30 likes

    TypeApp is an all-free, beautifully designed, universal email app, capable of managing unlimited number of mail accounts from various providers, allowing for smart push notifications while enabling personalization across multiple email accounts.

    54 TypeApp alternatives

    Cost / License

    • Free Personal
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Android Wear
    • Kindle Fire
    TypeApp screenshot 1
     
12 of 52 Microsoft Outlook alternatives