Open Source Microsoft Outlook Alternatives
The best open source alternative to Microsoft Office Outlook is Thunderbird. If that doesn't suit you, our users have ranked more than 100 alternatives to Microsoft Office Outlook and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Microsoft Office Outlook are Evolution, K-9 Mail, Mailspring and FairEmail.
Microsoft Office Outlook alternatives are mainly Email Clients but may also be Calendar Apps or Email Organizers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Microsoft Office Outlook.- Paid • Proprietary
- Mac
- Windows
- Online
- Android
- iPhone
- Android Tablet
- Windows Phone
- iPad
- Apple Watch
- Android Wear
- Free • Open Source
- Mac
- Windows
- Linux
- BSD
- PortableApps.com
- Haiku
Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.
Thunderbird vs Microsoft Office Outlook opinions
Seems to be more secure than Microsoft alternatives and more easily updatable.
JohnFastmanDespite 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 transitioned all ove my computers from Windows to Linux. I had 4 computers so I used four different distributions with different linux bases, Debian and Arch. Thunderbird worked perfectly. The email client is awesome, I think they should devote more development efforts to calender and task management integration.
sangwenobdiIt can access email server just as outlook
Can202ThunderBird es la mejor alternativa open source, ya que puedes personalizarlo, mi recomendación es usar la extención CheckBox, Thunderbird junto a CheckBox (extensión), la mejor APP para Mail
Thunderbird is best that other application listed here and GUI is also nice
Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality.
Evolution vs Microsoft Office Outlook opinions
It runs on Linux and you still have content if you are offline.
I've found it better than thunderbird and it can work with exchange just with one free plugin
This would be the best alternative, except that it requires the Gnome desktop, so users of other desktop environments need to look elsewhere.
Fast and User friendly. Light-weight and classic menus really give a touch of old classic office 2003. Easy integration of mails especially exchange mails without facing any bottlenecks.
Support for EWS allows me to connect to exchange and get all the benefits like contacts and calendar I wouldn't so easily get on Thunderbird. Also it nicely integrates with the built in Ubuntu calendar as well which is a big plus.
- Free • Open Source
- Android
- Android Tablet
- F-Droid
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.
K-9 Mail vs Microsoft Office Outlook opinions
JohnFastmanNot 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.
Online_Purchases1Deletes 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.
- Freemium • Open Source
- Mac
- Windows
- Linux
- Arch Linux
- Fedora
- Ubuntu
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.
Mailspring vs Microsoft Office Outlook opinions
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!
- Freemium • Open Source
- Android
- Android Tablet
- F-Droid
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.
FairEmail vs Microsoft Office Outlook opinions
RasheedAZopen source, secure, regularly updated
Geary is an email application built around conversations, for the GNOME 3 desktop.
Geary vs Microsoft Office Outlook opinions
Beatiful frontend Stable working Advanced features
Claws Mail is an email client (and news reader), based on GTK+, featuring
Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility Robustness and stability.Claws Mail vs Microsoft Office Outlook opinions
Claws Mail is email only, does not have many of the features of Outlook. Displaying HTML mail is sketchy at best.
KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE. It supports calendars, contacts, notes, to-do lists, news, and email.
Kontact - KMail vs Microsoft Office Outlook opinions
This is a very integrated suite of programs offering all the functionality of Outlook. Native to KDE's Plasma desktop environment.
- Free • Open Source
- Mac
- Windows
- Linux
- Xfce
Mutt is a small but very powerful text-based mail client for Unix operating systems.
Mutt vs Microsoft Office Outlook opinions
It's a console based application without proper calendar support. A key feature of outlook
scholasticphilosopherPowerful configuration is possible with mutt, and vim in the terminal.
mutt is email only, terminal based.
Personal Information Manager (Mail, Contact, Calendar and more).