Web Mail Usage Statistics and Market Share in European Union (.eu)

We are tracking usage statistics and market share for 5 web technologies in the Web Mail market in European Union (.eu). As of February 2026, the most popular web technology in Web Mail in European Union (.eu) is RoundCube, with 79% market share. In second place is SquirrelMail, with 9%. After that, Outlook Web App holds 7%, followed by Zimbra with 1% and RainLoop with 1%. Top 5 web technologies together account for 97% of the market. The remaining 0 web technologies in Web Mail collectively have a 3% market share. Global Web Mail market share report is available here.

Last updated: 8 February 2026

Web Mail Market Share in European Union (.eu) in February 2026

About Web Mail

Web mail is an email client implemented as a web application running on a web server.

We are tracking 5 different technologies in Web Mail.

There are 161 websites using Web Mail in European Union (.eu websites) in out database.

Web Mail Usage Statistics and Market Share in European Union (.eu) in February 2026

#1 RoundCube 78.88%

RoundCube is a webmail client that allows users to access and manage their email through a web browser, providing features such as composing, sending, and managing emails, as well as accessing attachments and address books. It is designed to be easy to use and compatible with various email servers.

#2 SquirrelMail 8.70%

SquirrelMail is an open-source webmail application that allows users to access and manage their email directly from any web browser, eliminating the need for dedicated email client software. It provides a user-friendly interface for composing, reading, and organizing emails, as well as managing contacts and settings. SquirrelMail is highly customizable and can be easily integrated with various email servers.

#3 Outlook Web App 6.83%

Outlook Web App (OWA) is a web-based interface for accessing Microsoft Exchange email, calendar, and contacts from any internet-connected device. It offers a familiar Outlook experience, including email composition, task management, and calendar events. The service is accessible via any modern web browser.

#4 Zimbra 4.35%

Zimbra is a powerful, open-source email, collaboration, and communication platform that offers web-based email, calendaring, task management, and instant messaging in a single, easy-to-use interface. It integrates seamlessly with popular devices and services, providing a comprehensive solution for both individuals and organizations.

#5 RainLoop 1.24%

RainLoop is a modern, web-based email client that offers a user-friendly interface for managing email accounts, providing a seamless experience for both personal and business use. It's lightweight, fast, and supports multiple email protocols. RainLoop can be easily installed and configured on various platforms, making it a popular choice for hosting providers and individuals seeking a customizable email solution.