25+ best Office Outlook Alternatives

Thunderbird

Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox. It supports POP (storing mail locally on your hard drive so that it can be accessed without an internet connection), and IMAP. It features excellent mail filter capabilities and management. Thunderbird has strong support for using multiple accounts and identities, including automated signature features.

• For me it is the only alternative to Outlook, if you want power of Outlook and open source there is just no other app. wookahn624 • Jun 2018 • 6 agrees and 2 disagrees Disagree   Agree
• Seems to be more secure than Microsoft alternatives and more easily updatable. Guest • Apr 2017 • 10 agrees and 4 disagrees Disagree   Agree
• 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. JohnFastman • Jan 2017 • 14 agrees and 8 disagrees Disagree   Agree
• It is a really poor software, no featureas, it's complicated. Try to configure a signature with a logo and you will see.... Terrible!! Guest • Jun 2017 • 14 agrees and 23 disagrees Disagree   Agree

Free Open Source Mac Windows Linux BSD PortableApps.com ... Haiku

Mailbird

Mailbird is a Windows based email client which design and style match Windows 7, 8 and XP’s native styles. Mailbird provides clean, simple and lightning fast email experience. The current free version of Mailbird has Multi Account support for Gmail, Yahoo, Outlook.com, iCloud, and any other IMAP/POP3 email provider. S/MIME and PGP are not supported.

• These are email clients not replacements for outlook Guest • May 2019 • 1 agrees and 3 disagrees Disagree   Agree
• Not enough functionality. No smart attachment feature, no quick sort by address or flags or attachments etc. Not really a business email client Guest • Nov 2018 • 2 agrees and 3 disagrees Disagree   Agree

Freemium $ $ $ Windows

eM Client

eM Client is a full featured email client with a modern and easy to use interface. - offers calendar, tasks, contacts and even chat. - supports all major services including Gmail, Exchange, iCloud, and Outlook.com. - easily imports your data from most of the other e-mail clients. This includes Microsoft Outlook, Outlook Express, Windows Mail, Windows Live Mail, Thunderbird, The Bat and more. - fully supports touch devices like touch-enabled laptops, tablets and hybrid devices.

• A nicer, less cluttered version of outlook. Biggest advantage is ease of navigation and use. E.g. you can view all mail and calendars in a single combined view, without tampering with any settings. Similarly, the tasks view is also very capable. Added to this, the support team are very responsive and helpful. logicbrick • Nov 2017 • 2 agrees and 4 disagrees Disagree   Agree

Freemium Mac Windows

K-9 Mail

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. JohnFastman • Jan 2017 • 3 agrees and 0 disagrees Disagree   Agree
• 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. Online_Purchases1 • Feb 2017 Disagree   Agree

Free Open Source Android Android Tablet

Evolution

Evolution is the official personal information manager and workgroup information management tool for GNOME. It combines e-mail, calendar, address book, and task list management functions. Features E-mail retrieval with the POP and IMAP protocols and e-mail transmission with SMTP. Secure network connections encrypted with SSL, TLS and STARTTLS. E-mail encryption with GnuPG and S/MIME. E-mail filters.

• 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. Guest • Sep 2018 Disagree   Agree
• 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. Guest • Jul 2018 • 1 agrees and 1 disagrees Disagree   Agree

Free Open Source Linux BSD S/MIME GNOME OpenPGP

Spark

Smart Inbox automatically detects if an email is personal, a notification or a newsletter and groups it with similar emails for easy batch processing using beloved swipes. With just a glance, you can see if emails are important or just a product announcement from a service you've never used. We all love the feeling of accomplishment when we have finally dealt with our inbox. Spark makes this easy to achieve. Quickly process your emails, swiping to archive or delete as necessary.

Freemium $ $ $ Mac Android iPhone

Apple Mail

Apple Mail changes the way you interact with your email every day. Mail displays your messages and open email side by side in a widescreen, two-column view. The favorites bar below the toolbar works much like a bookmarks bar in a web browser, giving you one-click access to your mail folders. A compact preview of each message — including the first two lines — lets you scan your messages at a glance.

• Outlook is an all-in-one solution including mail calendar etc. this soft does only one thing Guest • Oct 2015 • 10 agrees and 11 disagrees Disagree   Agree

Free Mac iPhone iPad

Mailspring

Mailspring is a desktop email client designed for macOS High Sierra, Windows 10 and Linux. With modern features like unified inbox, snoozing, templates, offline search, and support for Gmail labels, Mailspring will breathe life back into your tired inbox! Mailspring is free and supports all IMAP providers, including Gmail, Office 365 and iCloud. Mailspring does not support Exchange ActiveSync.

• 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! Guest • Jul 2019 • 0 agrees and 1 disagrees Disagree   Agree

Freemium $ $ $ Mac Windows Linux Arch Linux Fedora ... Ubuntu

Claws Mail

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

Free Open Source Windows Linux BSD

Postbox

Postbox is an email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity of Apple Mail, but with more power and flexibility to manage even the most demanding workloads. Key Features * Ultra-Fast Search - Instantly find messages, attachments, images, links, and contacts. * Conversation Views - Make sense of email threads through chronological message views.

Commercial $ $ $ Mac Windows

OpenProject

OpenProject is an open source software for project management with a wide set of features and plugins and an active international community. It supports project timelines / Gantt charts, issue tracking, wiki, document management, time and cost reporting, code management, Scrum and much more.

Freemium $ $ $ Open Source Web Self-Hosted Ruby Cloudron

Geary

Geary is a lightweight email program designed around conversations and built for the GNOME desktop. It's designed to let you read your email quickly and effortlessly. Its interface is based on conversations, so you can easily read an entire discussion without having to click from message to message. Geary is written in Vala .

Free Open Source Linux Chrome OS BSD GNOME

Airmail

Airmail is a lightweight and lightning fast mail client for Mac. Feature list: Accounts: - Unified Inbox and folders - Multi Account with editable html signatures. - Aliases management with custom SMPT - Support for Gmail, GoogleTM Apps, iCloudTM, Yahoo!, AOL and Generic IMAP.

Commercial Mac iPhone iPad Apple Watch

Mutt

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 list-reply, active development community, POP3 support, IMAP support.

• Powerful configuration is possible with mutt, and vim in the terminal. scholasticphilosopher • Mar 2018 • 1 agrees and 2 disagrees Disagree   Agree

Free Open Source Mac Windows Linux Xfce

Apple Calendar

Keep track of your busy schedule and share it with others using Calendar. Create separate calendars — one for home, another for school, a third for work, and so on. See all your calendars in a single window or choose to see only the calendars you want. Calendar lets you create invitations using information from Contacts, update your guest list, keep track of responses, and receive the latest status information.

• it's a calendar app not a email client! Guest • 3 days ago Disagree   Agree
• Outlook is an all-in-one solution including mail calendar etc. this soft does only one thing Guest • Oct 2015 • 2 agrees and 3 disagrees Disagree   Agree
• It is a calendar not an email app Guest • Sep 2015 • 0 agrees and 1 disagrees Disagree   Agree

Free Mac iPhone iPad iCloud

Sylpheed

Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA). Sylpheed runs on many systems such as Windows, Linux, BSD, Mac OS X and other Unix-like systems. Sylpheed uses GTK+ GUI toolkit. The newest version of Sylpheed works with GTK+ 2.4 or later (2.6 or later is recommended). Sylpheed is a free software distributed under the GNU GPL (the library part is GNU LGPL). You can freely use, modify and redistribute it under the license.

Free Open Source Mac Windows Linux BSD PortableApps.com

Open365

Open365 is an Open Source, self-hosted file sync and cloud apps platform including a full LibreOffice Online. You can also access your email, calendar and contacts using KDE Kontact. Everything is accessible from a simple webpage using any HTML5 browser.

• Discontinued The project seems to be no longer developed. Last commit on the GitHub repo was made on June 27th, 2016, but it can be still downloaded and installed.

Free Open Source Android Self-Hosted

Microsoft Mail and Calendar

Windows 10 has Mail and Calendar apps already built in. With the Mail application you can now easily see all message from your favorite people, more clearly organize social updates and newsletters, and use the popular “Sweep” feature to clean up your inbox.

• Bundled in win 10 and very simple to use. Great if you just read mail. Guest • Jun 2017 • 1 agrees and 1 disagrees Disagree   Agree

Free Windows Windows S

EssentialPIM

EssentialPIM lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications. PIM stands for Personal Information Manager, and it allows you to keep all you information in electronic form. All your appointments, tasks, to do lists, notes and contacts are stored in a graphical and easily accessible form.

• Tricky to configure. Does not speak MAPI, but many Cloudservices. I was not successful to synchronize OwnCloud Guest • Dec 2016 • 0 agrees and 1 disagrees Disagree   Agree

Freemium $ $ $ Windows Android iPhone

Kontact - KMail

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. It uses KParts to embed the various applications (KMail, KAddressBook, Akregator, etc.) into the container application.

Free Open Source Mac Windows Linux BSD

FairEmail

This email app might be for you if your current email app: takes long to receive or show messages can manage only one mailbox cannot show conversations cannot work offline looks outdated is not maintained stores your email on their servers is closed source, potentially violating your privacy

Freemium $ $ $ Open Source Android Android Tablet F-Droid

Spike

Spike is the world’s first Conversational email app. We’re upgrading the way you work, saving you and your team time, sanity, and a lot of headaches. Our goal is simple: bring all of your communication -- your emails, chats, calls, team collaborations, tasks, voice notes, everything -- to one place. It’s what your team has been looking for in a productivity and messaging app, but easier, and all from your inbox.

• Brings all of my communications into one place. Also allows for easier sending, saving, and sharing of files shared amongst my teams. Guest • 10 days ago Disagree   Agree

Freemium $ $ $ Mac Windows iPhone iPad

BlueMail

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.

Free Personal $ $ $ Mac Windows Android iPhone Chrome OS ... Android Tablet iPad Apple Watch

Polymail

Polymail is the modern email client, redesigned. Master your inbox with the most powerful email productivity tools — Email Tracking, Read Later, Send Later & more. All from a simple, unified interface. Say goodbye to cluttered browser add-ons and hello to beautiful email productivity. - Unlimited per-recipient email tracking - know exactly when and by whom your messages are read. - Snooze emails to be read later, when you need them.

Commercial $ $ $ Mac iPhone iPad

TypeApp

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. TypeApp is the perfect replacement for your email app. With a powerful unified accounts experience packaged in an intuitive and easy to use design, TypeApp provides a top notch email service.

Free Personal Android iPhone Android Tablet iPad Android Wear ... Kindle Fire