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: 11/22/2019 7:40:00 AM

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Alternatives to Microsoft Office Outlook for all platforms 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.
- It has all the calendaring features and email management features of outlook but is open source Guest • Oct 2019
- 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 • 7 agrees and 2 disagrees
- Provides most of those features Outlook offers to users for professional work. The missing features are very specific, and with the additional security, still a nice trade off. oomelyannaoo • Sep 2019
- Seems to be more secure than Microsoft alternatives and more easily updatable. Guest • Apr 2017 • 12 agrees and 4 disagrees
- 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 • 15 agrees and 8 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 • 14 agrees and 24 disagrees
Free Open Source Mac Windows Linux BSD PortableApps.com ... Haiku
Extensible by Plugins/Extensions Built-in RSS reader Calendar integration Support for IMAP ... Multiple Account support Open Source apps SMTP integration Add-ons Built-in Calendar Categories Customizable Delivery reports Encryption Extensible by Plugins/Extensions Free API Gmail integration Google Calendar integration Import from Google Reader HTML Compose Integrated Chat Integrated Password Manager Integrated Web Browser Legacy addons support Open source software Export to OPML Import feeds from OPML Protected by Password POP3 Support Portable Secure File Sharing Tabbed interface Support for Themes Add a feature

1937 Like
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 5 disagrees
- 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
Commercial $ $ $ Windows
Undo send Asana integration Clean design Sync Contacts ... Contacts Dropbox integration Facebook integration GSuite Integration Multiple Account support Organize mails Sidebar Slack client Slack integration Social network Threaded Conversations Trello integration Twitter integration Unified inbox Add a feature

286 Like
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
Freemium Mac Windows
Calendar Calendar integration Automatic Backup Built-in themes ... Built-in translation CalDAV CardDAV Chat Cloud sync Combined Inbox Sync Contacts Contacts Encrypted Email Email preview Apps that Sync with Google Calendar Support for IMAP Imports email from Live mail Night mode/Dark Theme POP3 Support Ssl Calendar Sync Threaded Conversations Add a feature

199 Like
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.
- 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 • 1 agrees and 0 disagrees
- 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 • 4 agrees and 0 disagrees
Free Open Source Android Android Tablet F-Droid
Ad-free Configurable Encrypted chat Encryption ... Exchange Header sorting Multiple Account support One view multiple accounts PGP Encryption Privacy focused Add a feature

222 Like
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 • 1 agrees and 0 disagrees
- 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 • 2 agrees and 1 disagrees
Free Open Source Linux BSD S/MIME GNOME OpenPGP
Calendar integration CalDAV Built-in RSS reader Calendar ... CardDAV Encrypted Email Integrated Spam Protection Multiple languages POP3 Support Reminders Add a feature

164 Like
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
Calendar integration Clean design Multiple Account support Postpone email reception ... Sync across Devices Add a feature

88 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.
- 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 • 1 agrees and 1 disagrees
Freemium $ $ $ Mac Windows Linux Arch Linux Fedora ... Ubuntu
Multiple Account support Unified inbox Email tracking Night mode/Dark Theme ... Customizable Night mode/Dark Theme Support for Themes Ad-free Auto update Beauty and fluid interface Built-in themes Drag n drop Electron based Email Analytics Extensible by Plugins/Extensions Support for IMAP Linux Multi-platform support Open source software Sidebar Theme Customization Threaded Conversations User friendly Add a feature

62 Like
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
Free Mac iPhone iPad
CalDAV CardDAV Encrypted Email Bundled with macOS ... Rich text editing UI customization Add a feature

221 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 Calendar Content Filtering ... Customizable Extensible by Plugins/Extensions Support for IMAP Integrated Email Client Multiple languages Multiple Account support Add a feature

87 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 ... Exchange Extensible by Plugins/Extensions Support for IMAP Multiple languages Onedrive integration POP3 Support Tabbed interface Visual Programming Add a feature

140 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 Chrome OS BSD GNOME
Multiple Account support Add a feature

79 Like
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
Collaborative project management Kanban boards Computer-aided machining (CAM) Cost Calculator ... Cost estimate Gantt-charts Reporting Splitting costs Timeline Work Item Tracking Add a feature

61 Like
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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.
- Outlook is an all-in-one solution including mail calendar etc. this soft does only one thing Guest • Oct 2019
Commercial Mac iPhone iPad Apple Watch
Clean design Customizable Dropbox integration Fullscreen support ... Lightweight Multiple Account support Add a feature

69 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 Windows Linux BSD
No features added Add a feature

38 Like
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 • 2 agrees and 2 disagrees
Free Open Source Mac Windows Linux Xfce
Command line Command line interface Support for IMAP POP3 Support ... S/MIME support Add a feature

58 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.
- Bundled in win 10 and very simple to use. Great if you just read mail. Guest • Jun 2017 • 1 agrees and 1 disagrees
Free Windows Windows S
Calendar Email tracking Task Management Bundled with Windows Add a feature

27 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.
- it's a calendar app not a email client! Guest • Sep 2019
- 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
- It is a calendar not an email app Guest • Sep 2015 • 0 agrees and 1 disagrees
Free Mac iPhone iPad iCloud
Calendar Sync with iCloud Week Planner Add a feature

132 Like
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
Lightweight POP3 Support Portable Add a feature

57 Like
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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
Cloud sync Add a feature

28 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.
- 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
Freemium $ $ $ Windows Android iPhone
Calendar Notetaking Portable Add a feature

61 Like
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
Calendar integration Privacy focused Add a feature

12 Like
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 Linux Android iPhone ... Chrome OS Android Tablet iPad Apple Watch
Ad-free Calendar integration Support for IMAP POP3 Support ... Unified inbox Add a feature

16 Like
Spike

Spike is a modern communication and collaboration workspace which turns your existing email into simple, chat-like conversations. Bring all of your communication -- your emails, chats, calls, team collaboration, tasks, everything -- to one place. It’s what your team has been looking for in a productivity and messaging app, all in a single workspace. There's life before Spike. And after Spike.
- Brings all of my communications into one place. Also allows for easier sending, saving, and sharing of files shared amongst my teams. Guest • Sep 2019
Freemium $ $ $ Mac Windows Web Android iPhone ... iPad
Built-in File Manager Priority Inbox Unified inbox Built-in Calendar ... Built-in translation Bulk actions Chat Google Chrome Extensions Cloud sync Conversational email approach Dropbox integration Email Archiving Encrypted Email Encrypted chat Exchange Integration File Compression File Searching Gmail integration Google Drive integration Group chat Group collaboration ICloud Integration Integrated Chat Live Preview Multiple Account support Night mode/Dark Theme Office 365 integration Organize mails Outlook integration Image Preview Real time collaboration Real-time monitoring Real-time tracking Send later Suggested replies Team Collaboration Threaded Conversations Undo send Unified Calendar Unified search Video calling Web-Based Yahoo Integration Add a feature

18 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.

Commercial $ $ $ Mac iPhone iPad
Sync Contacts Email scheduling Email tracking Multiple Account support Add a feature

23 Like
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
Calendar Contacts Convert Email to Task Feed Reader Add a feature

28 Like