Web Mail Usage Statistics and Market Share in United Kingdom (.uk)
We are tracking usage statistics and market share of 5 web technologies in Web Mail in United Kingdom (.uk). In June 2025 the most popular web technology in Web Mail in United Kingdom (.uk) is RoundCube with 60% market share. In second place there is SquirrelMail with 25% market share. After that there are Outlook Web App with 10%, RainLoop with 1% and Zimbra with 1% market share. Top 5 web technologies together have 97% market share. The remaining 0 web technologies in Web Mail have a combined market share of 3%. Global Web Mail market share report is available here.
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 107 websites using Web Mail in United Kingdom (.uk websites) in out database.
Web Mail Usage Statistics and Market Share in United Kingdom (.uk) in June 2025
#1 RoundCube 
59.81%
#2 SquirrelMail 
25.23%
#3 Outlook Web App 
10.28%
#4 RainLoop 
3.74%
#5 Zimbra 
0.93%
Technologies in Web Mail in United Kingdom (.uk)
RoundCube
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.
SquirrelMail
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.
Outlook Web App
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.
RainLoop
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.
Zimbra
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.
Web Mail Market Share History in United Kingdom (.uk) in Last 12 Months
| Technology | August 2024 | September 2024 | October 2024 | November 2024 | December 2024 | January 2025 | February 2025 | March 2025 | April 2025 | May 2025 | June 2025 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RoundCube | 57.84% | 57.84% | 57.84% | 57.84% | 57.84% | 57.84% | 58.25% | 58.25% | 59.43% | 59.81% | 59.81% |
| SquirrelMail | 26.47% | 26.47% | 26.47% | 26.47% | 26.47% | 26.47% | 26.21% | 26.21% | 25.47% | 25.23% | 25.23% |
| Outlook Web App | 10.78% | 10.78% | 10.78% | 10.78% | 10.78% | 10.78% | 10.68% | 10.68% | 10.38% | 10.28% | 10.28% |
| RainLoop | 3.92% | 3.92% | 3.92% | 3.92% | 3.92% | 3.92% | 3.88% | 3.88% | 3.77% | 3.74% | 3.74% |
| Zimbra | 0.98% | 0.98% | 0.98% | 0.98% | 0.98% | 0.98% | 0.97% | 0.97% | 0.94% | 0.93% | 0.93% |