Open Source Microsoft Outlook Alternatives for Mac

There are many alternatives to Microsoft Outlook for Mac if you are looking for a replacement. The best open source Mac alternative is Thunderbird. If that doesn't suit you, our users have ranked more than 100 alternatives to Microsoft Outlook and 12 are open source and available for Mac so hopefully you can find a suitable replacement. Other interesting open source Mac alternatives to Microsoft Outlook are Betterbird, Mailspring, Sylpheed and Mutt.

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

     2566 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.

    88 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
    Thunderbird vs Microsoft Outlook Comments
    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
    • 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. Betterbird icon

    Betterbird

     82 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.

    30 Betterbird alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • Chocolatey
    Betterbird screenshot 1
     
  4. 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.

    44 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
  5. Sylpheed icon

    Sylpheed

     62 likes

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

    Cost / License

    • Free
    • Open Source

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    • PortableApps.com
    Main screen
     
  6. Mutt icon

    Mutt

     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...

    53 Mutt alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Xfce
    Mutt screenshot 1
     
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    3
    Mutt vs Microsoft Outlook Comments
    Guest
    Negative
    1

    It's a console based application without proper calendar support. A key feature of outlook

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

    Powerful configuration is possible with mutt, and vim in the terminal.

    Guest
    Negative
    -1

    mutt is email only, terminal based.

    Review by a new / low-activity user.
    • Mutt is Free and Open SourceMicrosoft Outlook is Paid and Proprietary
  7. Scribe Mail icon

    Scribe Mail

     8 likes

    Scribe is a small portable email client with an intergrated contact database and calendar. It supports all the major internet mail protocols and uses international standards where possible. Scribe doesn't required installing or uninstalled and can be used from a removable...

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Haiku
    Main window
     
  9. LucaMail icon

    LucaMail

     9 likes

    LucaMail is an open source, cross-platform email client. LucaMail is developed to provide cross-platform alternative to Email Clients that are really exists. LucaMail focuses on modern technologies as well as maintaining a user-friendly UI.

    71 LucaMail alternatives

    Cost / License

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    LucaMail screenshot 1
     
  10. Columba icon

    Columba

     6 likes

    Columba is an email client written in Java, featuring a user-friendly graphical interface with wizards and internalionalization support. Its a powerful mail management tool with features to enhance your productivity and communication.

    Cost / License

    • Free
    • Open Source

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    Columba screenshot 1
     
  11. Nylas Mail Lives icon

    Nylas Mail Lives

     3 likes

    Nylas Mail Lives is a fork of Nylas Mail that fixes many longstanding issues, improves the client experience, and is committed to publish new releases.

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • Self-Hosted
    Nylas Mail Lives screenshot 1
     
  12. Aerion icon

    Aerion

     1 like

    Aerion is a modern, lightweight email client inspired by Geary, focused on resource efficiency and a clean user experience.

    Cost / License

    Application type

    Platforms

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

    Mulberry

     8 likes

    Mulberry is a powerful, easy to use electronic mail (email) and calendar program that allows you to send, access, and manage email and calendars. Mulberry also helps you manage other related information, such as contact information.

    Cost / License

    • Free
    • Open Source

    Application types

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    Mulberry on Windows XP
     
  14. Eudora icon

    Eudora

     1 like

    Eudora started in 1988, at the University of Illinois because the internet was a growing and burgeoning place, but email was not really established on the desktop computers that people were using at the time.

    Cost / License

    • Free
    • Open Source

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
     
12 of 12 Microsoft Outlook alternatives