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: 9/19/2020 3:52:00 PM

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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.
- The interface is just impossible for many people to use. Guest • Aug 2020 • 13 agrees and 3 disagrees
- 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. Guest • Sep 2020
- It can access email server just as outlook sangwenobdi • Aug 2020
- ThunderBird 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 Can202 • Jul 2020 • 1 agrees and 0 disagrees
- Thunderbird is best that other application listed here and GUI is also nice Guest • May 2020 • 2 agrees and 0 disagrees
- IMO, Thunderbird is leaps and bounds ahead of Outlook with a far more fluid and intuitive user interface. Guest • Jan 2020 • 3 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 • 3 agrees and 1 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 • 9 agrees and 3 disagrees
- It has all the calendaring features and email management features of outlook but is open source Guest • Oct 2019
- Seems to be more secure than Microsoft alternatives and more easily updatable. Guest • Apr 2017 • 13 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 26 disagrees
Free Open Source Mac Windows Linux BSD PortableApps.com ... Haiku
Support for IMAP Extensible by Plugins/Extensions SMTP integration Built-in RSS reader ... Multiple Account support Add-ons Calendar integration Encryption Extensions Plugins Desktop interface Gui Integrated Web Browser Intuitive Night mode/Dark Theme Protected by Password Support for POP3 Tabs Built-in Calendar Categories Customizable Delivery reports Extensible by Plugins/Extensions Free API Gmail integration Google Calendar integration Import from Google Reader HTML Compose Integrated Chat Integrated Password Manager Legacy addons support Export to OPML Import feeds from OPML Organize mails POP3 Support Portable Secure File Sharing Tabbed interface Support for Themes Add a feature

2045 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.
- One of the only fully integrated email and calendar solutions that supports Office365, Exchange, Outlook, Gmail, GSuite, POP, and IMAP. Good performance and usability. Guest • Jun 2020
- It has all features like Outlook: tasks, calendar, mail, .... good design, ... Guest • Apr 2020 • 2 agrees and 0 disagrees
- It is not very overcomplicated! Very simple, but functional design. therefore also very easy to set up and use. hellih • Nov 2019
- 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 integration CalDAV CardDAV Cross-platform ... Exchange Gmail integration Support for IMAP Multiple Account support Night mode/Dark Theme PGP Encryption POP3 Support Syncs with GMAIL IMAP Unified inbox Video chat Automatic Backup Built-in themes Built-in translation Cloud sync Combined Inbox Sync Contacts Contacts Encrypted Email Email preview Apps that Sync with Google Calendar Imports email from Live mail Night mode/Dark Theme Organize mails Outlook integration Ssl Calendar Sync Threaded Conversations Add a feature

209 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 11 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
Night mode/Dark Theme Undo send Asana integration Clean design ... Sync Contacts Contacts Dropbox integration Facebook Facebook integration GSuite Integration Multiple Account support News Organize mails Sidebar Slack client Slack integration Threaded Conversations Trello integration Twitter Twitter integration Unified inbox Add a feature

289 Like
Evolution

Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality. Evolution supports a wide range of industry standard data formats and network protocols for information exchange, with an emphasis on standards compliance and security. Evolution can also integrate smoothly with Microsoft Exchange by way of the “Exchange Web Services” (EWS) extension.
- 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
- I've found it better than thunderbird and it can work with exchange just with one free plugin Guest • Jan 2020 • 0 agrees and 1 disagrees
- This would be the best alternative, except that it requires the Gnome desktop, so users of other desktop environments need to look elsewhere. Guest • Jan 2020 • 0 agrees and 2 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 Calendar view CardDAV ... Contacts Exchange Apps that Sync with Google Calendar Support for WebDAV Built-in RSS reader Encrypted Email Integrated Spam Protection Multiple languages POP3 Support Reminders Add a feature

175 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 • 5 agrees and 1 disagrees
Free Open Source Android Android Tablet F-Droid
Ad-free Encryption Support for IMAP POP3 Support ... Configurable Encrypted chat Exchange Header sorting Multiple Account support One view multiple accounts PGP Encryption Privacy focused Add a feature

240 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 • 2 agrees and 2 disagrees
Freemium $ $ $ Mac Windows Linux Arch Linux Fedora ... Ubuntu
Unified inbox Multiple Account support Customizable Email tracking ... Night mode/Dark Theme Ad-free Auto update Beauty and fluid interface Built-in themes Linux Notifications Sidebar Snooze mail Theme Customization Support for Themes User friendly Drag n drop Electron based Email Analytics Extensible by Plugins/Extensions Support for IMAP Threaded Conversations Add a feature

77 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.
- Nice client. Great UI. It does lack Caldav support unfortunately. Guest • Jan 2020 • 0 agrees and 1 disagrees
Freemium Mac Android iPhone
Smart inbox Clean design Email scheduling Multiple Account support ... Snooze mail Sync across Devices Calendar integration Exchange Organize mails Postpone email reception Add a feature

91 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.
- Ease-of-use, simple setup, already installed Guest • Apr 2020
- Outlook is an all-in-one solution including mail calendar etc. this soft does only one thing Guest • Oct 2015 • 11 agrees and 14 disagrees
Free Mac iPhone iPad
Bundled with macOS CalDAV CardDAV Encrypted Email ... Exchange Organize mails Rich text editing UI customization Add a feature

226 Like
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Geary

Geary is an email application built around conversations, for the GNOME 3 desktop. It is 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. Features Modern and straightforward interface Quick account setup Supports Gmail, Yahoo! Mail, Outlook.com, and popular IMAP servers (Dovecot, Cyrus, Zimbra, etc.
- Beatiful frontend Stable working Advanced features Guest • 2 days ago
Free Open Source Linux Chrome OS BSD GNOME
Multiple Account support Gmail integration Support for IMAP Night mode/Dark Theme ... SMTP Add a feature

86 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
Exchange 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

146 Like