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, Betterbird, Mailbird 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 Windows + Free, Open Source, Linux, Android, Windows + Open Source, Free and EU. 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

     2602 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.

    95 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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    17
    Thunderbird vs Microsoft Outlook Comments
    Top Positive Comment
    John Fastman
    11

    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.
    Guest
    Negative
    0

    First, it does allow you to connect Zoom for meetings. Second, support is slow or provides little information.

    Review by a new / low-activity user.
    3 of 17 comments
    • 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

     236 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.

    66 eM Client alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Android
    eM Client: Inbox view
     
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    5
    eM Client vs Microsoft Outlook Comments
    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
    • eM Client is Freemium and ProprietaryMicrosoft Outlook is Paid and Proprietary
  4. Betterbird icon

    Betterbird

     86 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.

    36 Betterbird alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • Chocolatey
    Betterbird screenshot 1
     
  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. Mailbird icon

    Mailbird

     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.

    70 Mailbird alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    Mailbird screenshot 1
     
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    2
    Mailbird vs Microsoft Outlook Comments
    Guest
    Negative
    0

    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.
    • Mailbird is Freemium and ProprietaryMicrosoft Outlook is Paid and Proprietary
    • Mailbird is CustomizableMicrosoft Outlook is not according to our users
  8. Spark Mail icon

    Spark Mail

     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.

    68 Spark Mail alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • iPad
    • Apple Watch
    Spark Mail screenshot 1
     
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    1
    Spark Mail vs Microsoft Outlook Comments
    Guest
    Positive
    0

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

    Review by a new / low-activity user.
    • Spark Mail is Freemium and ProprietaryMicrosoft Outlook is Paid and Proprietary
  9. Mailspring icon

    Mailspring

     117 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.

    49 Mailspring alternatives

    Cost / License

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Arch Linux
    • Fedora
    • Ubuntu
    Clean design with integrated search and swipe gestures
     
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    3
    Mailspring vs Microsoft Outlook Comments
    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.
    • 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

     105 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.

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Windows
    • Linux
    • BSD
    The main window
     
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    1
    Claws Mail vs Microsoft Outlook Comments
    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.
    • 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. Pelton icon

    Pelton

     12 likes

    Pelton is a free, open-source email client that searches your whole mailbox locally, online or off. No telemetry, no servers of ours. Your mail stays on your machine.

    17 Pelton alternatives

    Cost / License

    Application type

    Platforms

    • Windows
    • Mac
    • Linux
    Pelton screenshot 1
     
  12. Aerion icon

    Aerion

     10 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.

    49 Aerion alternatives

    Cost / License

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • Flatpak
    Aerion screenshot 1
     
  13. EssentialPIM icon

    EssentialPIM

     77 likes

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

    177 EssentialPIM alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application types

    Platforms

    • Windows
    • Android
    • iPhone
    EssentialPIM screenshot 1
     
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    1
    EssentialPIM vs Microsoft Outlook Comments
    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.
    • EssentialPIM is Freemium and ProprietaryMicrosoft Outlook is Paid and Proprietary
  14. Canary Mail icon

    Canary Mail

     29 likes

    A secure, cross-platform email client with a unified inbox, built-in PGP encryption, and optional AI. Use powerful AI when you want it or turn it off completely. Your email, your control.

    66 Canary Mail alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Apple Watch
    Canary Mail screenshot 1
     
  15. BlueMail icon

    BlueMail

     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.

    39 BlueMail alternatives

    Cost / License

    • Free Personal
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Apple Watch
    • HUAWEI AppGallery
    BlueMail screenshot 1
     
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    1
    BlueMail vs Microsoft Outlook Comments
    rstefan
    Positive
    -1

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

    • BlueMail is Free Personal and ProprietaryMicrosoft Outlook is Paid and Proprietary
    • BlueMail is Lightweight and Privacy focusedMicrosoft Outlook is not according to our users
12 of 52 Microsoft Outlook alternatives