Best Free and Open Source Alternatives to Microsoft Outlook

Last Updated on April 16, 2022

Microsoft’s stance for decades was that community creation and sharing of communal code (later to be known as free and open source software) represented a direct attack on their business. Their battle with Linux stretches back many years. Back in 2001, former Microsoft CEO Steve Ballmer famously tarnished Linux “a cancer that attaches itself in an intellectual property sense to everything it touches”. Microsoft also initiated its “Get the Facts” marketing campaign from mid-2003, which specifically criticized Linux server usage, total cost of ownership, security, indemnification and reliability. The campaign was widely criticized for spreading misinformation.

However, in recent years, there has been a partial shift by Microsoft to embrace the open source software paradigm. For example, some of their code is open sourced. Examples include Visual Studio Code, .NET Framework, Atom, and PowerShell. They have also made investments in Linux development, server technology and organizations including the Linux Foundation and Open Source Initiative. They have made acquisitions such as Xamarin to help mobile app development, and GitHub a hugely popular code repository for open source developers. And they have partnered with Canonical, the developers of the popular Ubuntu distro. But many developers remain hugely sceptical about Microsoft and their apparent shift to embrace open source.

This series looks at the best free and open source alternatives to products and services offered by Microsoft.

Microsoft Outlook is a personal information manager software system, available as a part of the Microsoft Office suite.

Though primarily an email client, Outlook also includes such functions as calendaring, task managing, contact managing, note-taking, journal logging, and web browsing.

1. Thunderbird

Thunderbird is widely and deservedly regarded as an exceptional open source desktop email client, especially on Linux. It’s also a proficient personal information manager, news client, RSS and chat client.

Thunderbird is highly customizable, has a rich set of features, and is geared for both novices and professional users.

2. Evolution

Evolution provides integrated mail, address book and calendaring functionality to users of the GNOME desktop.

Evolution makes the tasks of storing, organizing, and retrieving your personal information easy, so you can work and communicate more effectively with others. It’s a highly developed groupware program, considered by many to be an integral part of the Internet-connected desktop.

Evolution supports Exchange Server and a number of other email setups found in a corporate environment.

3. Kontact

Kontact is a powerful PIM solution that handles your email, agenda, contacts and other ‘personal’ data together in one place. It consists of the Kontact PIM back end and the graphical applications connecting to the back end.

The suite includes KMail, a feature-rich email client that supports many protocols.

If all you need is a simple and lightweight email client, we recommend Sylpheed or Claws Mail.

All articles in this series:

Alternatives to Microsoft's Products and Services
	Bing offers search services, including web, video, image and map search products. It's developed using ASP.NET.
	Calculator is a simple yet powerful calculator that includes standard, scientific, programmer, and graphing calculator functionality, as well as a set of converters between various units of measurement and currencies.
	Dynamics 365 is a product line of enterprise resource planning and customer relationship management intelligent business applications.
	Edge is a cross-platform web browser. It is a Chromium-based browser with Blink and V8 engines.
	Exchange Server is a mail server and calendaring server. Exchange uses a single building block architecture.
	GitHub is a distributed version control and source code management functionality service. It includes non-Git elements.
	Office is a family of client software, server software, and services. Microsoft has promoted Office 365 as the primary means of obtaining Office.
	OneDrive is a file hosting service and synchronization service. Users can upload Microsoft Office documents to OneDrive.
	OneNote is a note-taking program for free-form information gathering and collaboration. It gathers users’ notes, drawings, screen clippings, and audio commentaries.
	Outlook is a personal information manager that's primarily an email client. It includes calendaring, task managing, contact managing, note-taking, journal logging, and web browsing.
	Planner lets users create Kanban boards using content-rich tasks with features including files, checklists, and labels.
	Project lets you develop schedules, assign resources, track progress, manage budget, and more. It's part of the Microsoft Office enterprise project management product.
	Publisher is a desktop publishing application with focus on page layout and design. Use text, photos and links to make professional publications personal.
	SharePoint is a web-based collaborative platform that’s often used as a document management and storage system.
	Skype is software for VoIP-based videotelephony, videoconferencing and voice calls. The software also provides instant messaging, file transfer, debit-based calls to landline and mobile telephones (over traditional telephone networks), and more.
	Snipping Tool is a screenshot utility. It can take still screenshots of an open window, rectangular areas, a free-form area, or the entire screen.
	SwiftKey is a virtual keyboard app for Android. SwiftKey learns from previous typed text and outputs predictions based on currently inputted text and what it has learned.
	Teams is a business communication platform. The service integrates with the company’s Office 365 subscription office productivity suite.
	Terminal is billed as “a modern, fast, efficient, powerful, and productive terminal application for users of command-line tools and shells like Command Prompt, PowerShell, and WSL”. It offers multiple tabs, panes, Unicode and UTF-8 character support, a GPU accelerated text rendering engine, and custom themes, styles, and configurations.
	To Do is a cloud-based task management application. It allows users to manage their tasks from a smartphone, tablet and computer.
	Visio is a diagramming and vector graphics application. Database modeling in Visio revolves around a Database Model Diagram (DMD).
	Visual Studio is an integrated development environment. It is used to develop computer programs, as well as websites, web apps, web services and mobile apps.
	Whiteboard provides a freeform, intelligent canvas where you and your team can create, and collaborate visually via the cloud. Designed for touch, type, and pen, it lets you write or draw as smoothly as you would with ink.
	Yammer is a social-networking platform for organizations. It’s a closed platform sometimes described as Facebook for businesses.