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25+ best Office Outlook Alternatives

Microsofts Office Outlook is one of the most used software in the world. It's of course most famous as a e-mail client but it can do much more. This list of alternatives is mainly focused on the e-mail part of things. Remember that you can filter to show only web alternative or even self-hosted alternatives by using a platform filter.

Maybe Calendar Integration or a built in RSS-feed support is important to you. Also remember that you can browse other apps as well if you for example looking for a dedicated todo-manager or a RSS reader.

The list of alternatives was last updated: 8/10/2018 11:22:00 AM

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Alternatives to Microsoft Office Outlook for all platforms with any license

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.

Freemium $ $ $ Windows
Undo send Asana integration Sync Contacts Conversation view ... Dropbox integration Facebook integration GSuite Integration Multiple Account support Slack integration Trello integration Twitter integration Unified inbox Add a feature

270 Like
- It is only for Mail and can not use Exchange Accounts Guest • Dec 2016 • 4 agrees and 6 disagrees
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.

Free Open Source Mac Windows Linux BSD PortableApps.com ... Haiku
Extensible by Plugins/Extensions Built-in RSS reader Built-in Calendar Calendar integration ... Categories Customizable Extensible by Plugins/Extensions Free API Gmail integration Google Calendar integration Import from Google Reader Support for IMAP Integrated Chat Integrated Web Browser Multiple Account support Export to OPML Import feeds from OPML POP3 Support Portable SMTP integration Tabbed interface Support for Themes Add a feature

1765 Like
- 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 • 9 agrees and 5 disagrees
- Seems to be more secure than Microsoft alternatives and more easily updatable. Guest • Apr 2017 • 5 agrees and 4 disagrees
- 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
- 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 • 12 agrees and 23 disagrees
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.

Free Open Source Android Android Tablet
Ad-free Configurability Multiple Account support PGP Encryption ... Privacy focused Add a feature

185 Like
- 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 • 2 agrees and 0 disagrees
- 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
Inbox by Gmail

Built on everything that we've learned from Gmail, Inbox is a fresh start that goes beyond email to help you get back to what matters. Bundles, because some messages just belong together. Promotions are now neatly organised. Purchases are in one place. All your trips are together. And create your own bundles for anything you like. See the Highlights at a glance See order updates, flight status, reservation details and pictures without having to open the message.

Free Web Android iPhone Chrome OS iPad ... Chrome
Sync with Google Calendar Mobile friendly No Exchange/365 Support To-Do management Add a feature

230 Like
- It is not able to connect to Microsoft Exchange Server or Office 365 account Guest • Apr 2016 • 8 agrees and 5 disagrees
- No Exchange support, no support for email outside of Google's Gmail Guest • Dec 2017 • 2 agrees and 0 disagrees
- No support for exchange / Office 365 (which is the main raison why anybody should use Outlook). Guest • Jan 2018
- Not an e-mail client but an interface for their own e-mail platform. Outlook is a client pnlrogue1 • Jul 2018
- Outlook is a client to work with all kinds of email accounts. Inbox by Gmail is just for Gmail. ugurozturk • Nov 2017
- Do not allow to work with IMAP or POP accounts Guest • Oct 2017 • 1 agrees and 2 disagrees
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.

Freemium Windows
Calendar integration Automatic Backup Built-in themes Built-in translation ... CalDAV CardDAV Cloud sync Combined Inbox Sync Contacts Conversation view Dark theme Email preview Encrypted email Sync with Google Calendar Support for IMAP Imports email from Live mail POP3 Support Sync Calendars Add a feature

180 Like
- 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 • 0 agrees and 1 disagrees
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.

Free Open Source Linux BSD S/MIME GNOME OpenPGP
Built-in RSS reader CalDAV Calendar integration CardDAV ... Encrypted email Integrated Spam Protection Multiple languages POP3 Support Add a feature

150 Like
- 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
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.

Free Mac iPhone iPad
CalDAV CardDAV Bundled with macOS Add a feature

209 Like
- Outlook is an all-in-one solution including mail calendar etc. this soft does only one thing Guest • Oct 2015 • 7 agrees and 8 disagrees
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.

Free Mac iPhone iPad Apple Watch
Calendar integration Cloud sync Configurability Configurable request timeout ... Multiple Account support Export to PDF Sync across Devices Add a feature

60 Like
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
Lightweight Built-in RSS reader Content Filtering Customizable ... Extensible by Plugins/Extensions Support for IMAP Multiple languages Multiple Account support Add a feature

76 Like
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 BSD GNOME
No features added Add a feature

70 Like
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
Multiple Account support Box.com integration Built-in RSS reader Dropbox integration ... Extensible by Plugins/Extensions Support for IMAP Multiple languages Onedrive integration POP3 Support Tabbed interface Visual Programming Add a feature

129 Like
Opera Mail

Opera Mail powerfully organizes, indexes, and sorts your messages. It has spam filtering (both automated and Bayesian), supports POP3 and IMAP, newsgroups as well as Atom and RSS feeds. Opera Mail uses one database that keeps an index of all mail, and sorts the messages automatically into several "views" or accesspoints. Messages are automatically sorted by type, such as mailing lists, and mail with attachments . This approach to indexing allows for quicker access to messages.

Free Mac Windows PortableApps.com
Built-in RSS reader Integrated Spam Protection Message Filtering Portable Add a feature

96 Like
- Discontinued Opera Mail is no longer updated and supported, but last version, 1.0.1044, released in February 2016, can be still downloaded from the official website.
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.

Free Open Source Mac OS X Windows Linux Xfce
Command line interface Support for IMAP POP3 Support S/MIME support Add a feature

51 Like
- Powerful configuration is possible with mutt, and vim in the terminal. scholasticphilosopher • Mar 2018 • 0 agrees and 2 disagrees
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.

Free Open Source Android Self-Hosted
Cloud sync Add a feature

28 Like
- 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.
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 OS X Windows Linux BSD PortableApps.com
Lightweight Add a feature

51 Like
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.

Freemium $ $ $ Open Source Mac OS X Windows Linux Arch Linux Fedora ... Ubuntu
Dark theme Multiple Account support Email tracking Sync Contacts ... Conversation view Customizable Drag n drop Email Analytics Email tracking & analytics Extensible by Plugins/Extensions Support for IMAP Support for Themes Unified inbox Add a feature

27 Like
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 OS X iPhone iPad Apple Watch
Customizable Dropbox integration Fullscreen support Lightweight ... Multiple Account support Add a feature

58 Like
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.

Freemium $ $ $ Windows Android iPhone
Portable Add a feature

58 Like
- Tricky to configure. Does not speak MAPI, but many Cloudservices. I was not successful to synchronize OwnCloud Guest • Dec 2016
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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 OS X Windows Linux BSD
No features added Add a feature

32 Like
The Bat

The Bat! is a secure email client software, built to protect your correspondence against third-parties. The Bat! protects your information through multiple encryption streams with the options to encrypt your emails on disk and during communication through an SSL/TLS connection. Free of global email providers that keep your messages in the cloud, and free of Web clients, The Bat! ensures your data stays private.

Commercial Windows S/MIME OpenPGP
Built-in RSS reader Support for IMAP POP3 Support Portable Add a feature

46 Like
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.

Free Windows Windows S
Email tracking Bundled with Windows Add a feature

19 Like
- Bundled in win 10 and very simple to use. Great if you just read mail. Guest • Jun 2017 • 0 agrees and 1 disagrees
Kontact

Kontact is the integrated Personal Information Manager of KDE. Kontact suite unites mature and proven KDE PIM applications under one roof. Thanks to the powerful KPart technology, existing applications are seamlessly integrated into one. The components of KDE Kontact are tailored to work well with each other. This results in features like intuitive drag-and-drop between appointment handling, task lists and contacts. KDE Kontact supports various groupware servers.

Free Open Source Windows Linux
Convert Email to Task Add a feature

25 Like
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.

Freemium Mac OS X iPhone iPad
Sync Contacts Email scheduling Email tracking Multiple Account support Add a feature

20 Like
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.

Free Mac iPhone iPad iCloud
Sync with iCloud Add a feature

125 Like
- 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
Canary Mail

Canary is an exciting new email client for Mac that offers a full set of powerful features with one key difference - your emails are not stored on a 3rd party server. Every facet of Canary has been designed in accordance with our core philosophy of ensuring complete user privacy and offering reliable & snappy performance. Unlike other apps/services, using Canary is not contingent on providing access to your data.

Commercial Mac OS X iPhone
No features added Add a feature

10 Like