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Todo List Managers Calendar Apps Windows + Free Paid • Proprietary Microsoft Outlook alternatives page was last updated Feb 8, 2025 Feb 8, 2025 Suggest Alternatives with 1 filter Linux Open Source Android Mac Windows iPhone 38 / 131 2423 likes 2423 likes 2423 likes Copy a direct link to this comment to your clipboard Free • Open Source Mac Windows Linux Android BSD AppImageHub Snapcraft Flathub PortableApps.com F-Droid Haiku Homebrew Chocolatey Customizable Customizable Extensible by Plugins/Extensions Extensible by Plugins/Extensions Multiple Account support Multiple Account support IMAP Support IMAP Support Calendar Integration Calendar Integration SMTP Support SMTP Support Email Organizer Email Organizer Add-ons Add-ons Built-in RSS reader Built-in RSS reader POP3 Support POP3 Support Graphical User Interface Graphical User Interface Dark Mode Dark Mode Google Calendar integration Google Calendar integration Thunderbird VS Microsoft Outlook Is Thunderbird a good alternative to Microsoft Outlook? Comments about Thunderbird as an Alternative to Microsoft Outlook All Relevance John Fastman John Fastman 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 positive comment Jan 1, 2017 12 Guest The interface is just impossible for many people to use. Top negative comment Aug 5, 2020 16 Shaz Shah Shaz Shah 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. Positive comment May 31, 2024 0 Show more comments 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 Microsoft Outlook is Paid and Proprietary Thunderbird is CustomizableMicrosoft Outlook is not according to our users Microsoft Outlook is not according to our users 346 likes 346 likes 346 likes Copy a direct link to this comment to your clipboard Free • Open Source Android Android Tablet F-Droid Configurable Configurable Privacy focused Privacy focused Lightweight Lightweight Ad-free Ad-free IMAP Support IMAP Support Multiple Account support Multiple Account support POP3 Support POP3 Support One view multiple accounts One view multiple accounts PGP Encryption PGP Encryption Unified inbox Unified inbox End-to-End Encryption End-to-End Encryption Works Offline Works Offline Contacts Contacts Dark Mode Dark Mode No Tracking No Tracking K-9 Mail VS Microsoft Outlook Is K-9 Mail a good alternative to Microsoft Outlook? Comments about K-9 Mail as an Alternative to Microsoft Outlook John Fastman John Fastman Not the prettiest, but it's open source (trustworthy), free, privacy-respecting and very functional. My go-to Android email client. I cannot hesitate less in recommending it. Positive comment Jan 10, 2017 4 Online_Purchases1 Online_Purchases1 Deletes e-mail from the server even when underground in NYC subway. Makes life so easy to delete e-mails while on the train When surfacing, K-9 syncs with the server and POOF....those unwanted e-mails are gone from the server. Positive comment Feb 22, 2017 1 Most users think K-9 Mail is a great Microsoft Outlook alternative. K-9 Mail is the most popular Android Tablet alternative to Microsoft Outlook. K-9 Mail is Free and Open SourceMicrosoft Outlook is Paid and Proprietary Microsoft Outlook is Paid and Proprietary K-9 Mail is Privacy focused and LightweightMicrosoft Outlook is not according to our users Microsoft Outlook is not according to our users 200 likes 200 likes 200 likes Copy a direct link to this comment to your clipboard Free • Open Source Linux BSD Flathub S/MIME GNOME OpenPGP Calendar Integration Calendar Integration Contacts Contacts CalDAV Support CalDAV Support Calendar View Calendar View Spam Filter Spam Filter Multiple Account support Multiple Account support Ad-free Ad-free Sync with Google Calendar Sync with Google Calendar Extensible by Plugins/Extensions Extensible by Plugins/Extensions Dark Mode Dark Mode Works Offline Works Offline GPG Encryption GPG Encryption Evolution VS Microsoft Outlook Is Evolution a good alternative to Microsoft Outlook? Comments about Evolution as an Alternative to Microsoft Outlook All Relevance Guest It runs on Linux and you still have content if you are offline. Top positive comment Nov 7, 2021 2 Guest This would be the best alternative, except that it requires the Gnome desktop, so users of other desktop environments need to look elsewhere. Positive comment Jan 18, 2020 -1 Guest I've found it better than thunderbird and it can work with exchange just with one free plugin Positive comment Jan 17, 2020 0 Show more comments Most users think Evolution is a great Microsoft Outlook alternative. Evolution is Free and Open SourceMicrosoft Outlook is Paid and Proprietary Microsoft Outlook is Paid and Proprietary 106 likes 106 likes 106 likes Copy a direct link to this comment to your clipboard Freemium • Open Source Mac Windows Linux Arch Linux Fedora Ubuntu Support for Themes Support for Themes Customizable Customizable Unified inbox Unified inbox Multiple Account support Multiple Account support Dark Mode Dark Mode Email tracking Email tracking Snooze Mail Snooze Mail Ad-free Ad-free Theme Customization Theme Customization Built-in translation Built-in translation Email Organizer Email Organizer Built-in themes Built-in themes Extensible by Plugins/Extensions Extensible by Plugins/Extensions Auto Update Auto Update Mailspring VS Microsoft Outlook Is Mailspring a good alternative to Microsoft Outlook? Comments about Mailspring as an Alternative to Microsoft Outlook Paul Paul 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. Positive comment Feb 7, 2023 0 Guest Speed of work, good connection to the mail server, speed search. Positive comment Jun 12, 2021 0 Guest 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! Positive comment Jul 3, 2019 0 Most users think Mailspring is a great Microsoft Outlook alternative. Mailspring is Freemium and Open SourceMicrosoft Outlook is Paid and Proprietary Microsoft Outlook is Paid and Proprietary Mailspring is CustomizableMicrosoft Outlook is not according to our users Microsoft Outlook is not according to our users 44 likes 44 likes 44 likes Copy a direct link to this comment to your clipboard Free • Open Source Mac Windows Linux Flathub Chocolatey Privacy focused Privacy focused Support for Themes Support for Themes Lightweight Lightweight Multiple Account support Multiple Account support Extensible by Plugins/Extensions Extensible by Plugins/Extensions Works Offline Works Offline Unified inbox Unified inbox Ad-free Ad-free Portable Portable No Tracking No Tracking Spam Filter Spam Filter Calendar Integration Calendar Integration SMTP Support SMTP Support IMAP Support IMAP Support POP3 Support POP3 Support Betterbird VS Microsoft Outlook Is Betterbird a good alternative to Microsoft Outlook? 75 likes 75 likes 75 likes Copy a direct link to this comment to your clipboard Freemium • Open Source Android Android Tablet F-Droid Privacy focused Privacy focused Customizable Customizable Multiple Account support Multiple Account support Email Notifications Email Notifications PGP Encryption PGP Encryption Extensive settings menu Extensive settings menu IMAP Support IMAP Support Notifications Notifications No Tracking No Tracking Works Offline Works Offline Ad-free Ad-free Unified inbox Unified inbox Dark Mode Dark Mode S/MIME Support S/MIME Support FairEmail VS Microsoft Outlook Is FairEmail a good alternative to Microsoft Outlook? Comments about FairEmail as an Alternative to Microsoft Outlook Rasheed AZ Rasheed AZ open source, secure, regularly updated Positive comment Apr 15, 2020 1 FairEmail is Freemium and Open SourceMicrosoft Outlook is Paid and Proprietary Microsoft Outlook is Paid and Proprietary FairEmail is Privacy focused and CustomizableMicrosoft Outlook is not according to our users Microsoft Outlook is not according to our users 104 likes 104 likes 104 likes Copy a direct link to this comment to your clipboard Free • Open Source Linux BSD Flathub GNOME Flatpak Lightweight Lightweight Privacy focused Privacy focused Multiple Account support Multiple Account support IMAP Support IMAP Support Conversational email approach Conversational email approach Dark Mode Dark Mode Ad-free Ad-free Gmail integration Gmail integration Spam Filter Spam Filter Email Organizer Email Organizer No Tracking No Tracking Labels for content Labels for content SMTP Support SMTP Support Multiple languages Multiple languages Geary VS Microsoft Outlook Is Geary a good alternative to Microsoft Outlook? Comments about Geary as an Alternative to Microsoft Outlook Guest Beatiful frontendStable workingAdvanced features Positive comment Sep 26, 2020 1 Most users think Geary is a great Microsoft Outlook alternative. Geary is Free and Open SourceMicrosoft Outlook is Paid and Proprietary Microsoft Outlook is Paid and Proprietary Geary is Lightweight and Privacy focusedMicrosoft Outlook is not according to our users Microsoft Outlook is not according to our users 7 of 38 Microsoft Outlook alternatives The best open source alternative to Microsoft Outlook is Thunderbird. If that doesn't suit you, our users have ranked more than 100 alternatives to Microsoft Outlook and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Microsoft Outlook are K-9 Mail, Evolution, Mailspring and Betterbird. Manage emails, calendars, contacts, and tasks with an intuitive interface. Features smart inbox, file management, and third-party app integration. Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support. 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. The interface is just impossible for many people to use. 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. 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. K-9 is an open source email client for Android with multi-folder sync, email signatures, Bcc-to-self, return-address configuration, keyboard shortcuts, Exchange Support, message flagging, IMAP deletes, saving attachments, configurable notifications and more. Not the prettiest, but it's open source (trustworthy), free, privacy-respecting and very functional. My go-to Android email client. I cannot hesitate less in recommending it. Deletes e-mail from the server even when underground in NYC subway. Makes life so easy to delete e-mails while on the train When surfacing, K-9 syncs with the server and POOF....those unwanted e-mails are gone from the server. Most users think K-9 Mail is a great Microsoft Outlook alternative. K-9 Mail is the most popular Android Tablet alternative to Microsoft Outlook. Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality. It runs on Linux and you still have content if you are offline. This would be the best alternative, except that it requires the Gnome desktop, so users of other desktop environments need to look elsewhere. I've found it better than thunderbird and it can work with exchange just with one free plugin Most users think Evolution is a great Microsoft Outlook alternative. 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. 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. Speed of work, good connection to the mail server, speed search. 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! Most users think Mailspring is a great Microsoft Outlook alternative. 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. FairEmail is a privacy-focused email client with a setup wizard that helpfully walks you through the steps to use it with any email provider. There are many privacy settings including encryption via OpenPGP and S/MIME and reformatted emails to avoid phishing. open source, secure, regularly updated Geary is an email application built around conversations, for the GNOME 3 desktop. Beatiful frontendStable workingAdvanced features Most users think Geary is a great Microsoft Outlook alternative. AlternativeTo is a free service that helps you find better alternatives to the products you love and hate. The site is made by Ola and Markus in Sweden, with a lot of help from our friends and colleagues in Italy, Finland, USA, Colombia, Philippines, France and contributors from all over the world. That's right, all the lists of alternatives are crowd-sourced, and that's what makes the data powerful and relevant. Feel free to send us your questions and feedback at hello@alternativeto.net, on our Discord or on social media. Follow us on X, Mastodon , Bluesky or Instagram. © 27 Kilobyte AB