Alternatives to Microsoft Office Outlook for Mac with any license

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 Calendar integration Customizable ... Extensible by Plugins/Extensions Extensible by Plugins/Extensions Free API Import from Google Reader Integrated Chat Integrated Web Browser Multiple Account support Export to OPML Import feeds from OPML POP3 Support Portable Tabbed interface Add a feature

1739 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 • 7 agrees and 5 disagrees
- Seems to be more secure than Microsoft alternatives and more easily updatable. Guest • Apr 2017 • 2 agrees and 4 disagrees
- 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 • 10 agrees and 20 disagrees
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 OS X iPhone iPad
Bundled with macOS Add a feature

205 Like
- Outlook is an all-in-one solution including mail calendar etc. this soft does only one thing Guest • Oct 2015 • 6 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 Export to PDF Add a feature

55 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 OS X 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 Add a feature

128 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 OS X Windows PortableApps.com
Built-in RSS reader Integrated Spam Protection Message Filtering Portable Add a feature

95 Like
- Discontinued Opera Mail seems to be no longer updated, but you can still download it from: http://www.opera.com/computer/mail
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
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

52 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

56 Like
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

30 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 Email tracking Multiple Account support 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

22 Like
Newton Mail

Newton is a subscription-based service that supercharges your email with power features across Mac, Windows, iPhone, iPad, Apple Watch, Android Phone, Tablet and Wear.

Commercial Mac OS X Windows Android iPhone Windows RT ... Android Tablet iPad Apple Watch Android Wear
Sync between devices Combined email cloud syncing Conversation view Focused Inbox ... Multiple languages Real-time pushing Salesforce integration Add a feature

38 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
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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 OS X iPhone iPad iCloud
No features added 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

9 Like
Zimbra Desktop

The free Zimbra Desktop client allows you to meld the online and offline worlds – storing and synching your email, calendar, contacts, files and documents in the cloud, yet having them locally accessible when on the road. Zimbra Desktop aggregates information across accounts (Zimbra, Yahoo! Mail, Gmail, Hotmail, etc.) and social networks (Facebook, Digg, Twitter, etc.) to help make communicating & sharing information easier than ever.

Free Personal Mac OS X Windows Linux
No features added Add a feature

29 Like
BusyCal

BusyCal is the most powerful, flexible, reliable calendar app for macOS. It's packed with time-saving features and compatible with all leading cloud services including iCloud, Google, Exchange and more. BusyCal displays your calendar in Day, Week, Month, Year and List views. What makes BusyCal unique is its ability to customize these views to more precisely meet your needs.

Commercial $ $ $ Mac
Group calendar filters Add a feature

15 Like
Astro

Astro is a modern email and calendar client powered by artificial intelligence, and built for people and teams. With Priority Inbox, Unsubscribe, Mute, Snooze, Send Later, and Swipes, managing your email is simple and fast. Astrobot helps you declutter your inbox and makes sure you don’t miss the important stuff in your day. It tells you when to unsubscribe and when to respond.

Free Mac Android iPhone iPad Slack ... Amazon Echo (Alexa Voice Service)
Calendar integration Email tracking Google Calendar integration Multiple Account support ... Snooze reliability Add a feature

20 Like
Hiri

Fast, good looking email client. Lighter than MS Outlook with some unique and clever features. You can use Hiri to connect to Exchange, Office365, or a Microsoft email account (Outlook.com, Live, Hotmail). Other email providers, such as Gmail, Yahoo, etc are currently not supported. Basics: - Fully integrated calendar - Tasks - Contacts - Built for Exchange, Office 365 and Outlook.com - Uses Microsoft's own protocol - EWS.

Commercial $ $ $ Mac OS X Windows Linux
Calendar integration Convert Email to Task Add a feature

12 Like
- Most of the clients listed do not have calendars or tasks. Hiri has it all and works really well with Office 365 kevkav • Jan 2017 • 1 agrees and 0 disagrees
- I like how it helps our company to be more productive and focused on tasks. Th UI/UX is much better than Outlook aleksandarbibovski • Jan 2017
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MailMate

MailMate is an IMAP e-mail client for Mac featuring extensive keyboard control, Markdown supported email composition, advanced search conditions and drill-down search links, equally advanced smart mailboxes, automatic signature handling, cryptographic encryption/signing (OpenPGP and S/MIME), tagging, multiple notification methods, alternative message viewer layouts including a widescreen layout, and much more.

Commercial $ $ $ Mac OS X S/MIME OpenPGP
No features added Add a feature

17 Like
Nylas Mail Lives

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.

Free Open Source Mac OS X Windows Linux Self-Hosted
Extensible by Plugins/Extensions Multiple Account support Add a feature

3 Like
Mulberry

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.

Free Open Source Mac OS X Windows Linux
CalDAV POP3 Support Sync Calendars Add a feature

6 Like
- Discontinued The project is no longer developed. Last version, 4.0.8, released in February 2007, can be still downloaded from the official website.
Ominder

Keep track of all your Events with free SMS and Email notifications. Store and organize your Events and To-do on Ominder and never forget them again. Events include weather forecast for better planning. All Events and To-do include countdown and age timers for better management.

Free Mac OS X Windows Linux Android Windows Phone
SMS Reminders Add a feature

5 Like
Simple Mail

Simple Mail is a mail client for Firefox. It allows you to get notified, read and write messages for multiple email accounts inside Firefox. Usage: Configure one or more accounts in Preferences, set account refresh time and get notified of new mail. When new mail arrives, Simple Mail shows new messages count in status bar. You can click Simple Mail icon to open received messages in a separate browser tab.

Free Mac OS X Windows Linux Firefox
No features added Add a feature

5 Like
GyazMail

GyazMail is a email client software for Mac OS X, based on Cocoa framework, simple, easy-to-use with many features.

Commercial Mac OS X
POP3 Support Add a feature

3 Like
IBM Notes

IBM Notes (formerly IBM Lotus Notes) is a desktop client for social business. This email software includes messaging, applications and social collaboration. IBM Notes features a clean, modern social user interface that provides activity streams, microblogging and social file sharing, directly from your Inbox.

Commercial Mac OS X Windows Linux
No features added Add a feature

5 Like