Gmail, which was launched in 2004, has become the leading email service provider globally. As of 2022, Gmail boasts over 1.5 billion active users, making it the most widely used email service in the world. Gmail's popularity can be attributed to its user-friendly interface, robust features, and seamless integration with other Google services like Google Drive, Google Calendar, and Google Hangouts.

Despite its loyal user base, Yahoo Mail has faced several challenges, including a series of high-profile data breaches and a decline in its overall user experience. However, Yahoo has made efforts to revamp its email service, introducing new features like a revamped interface and improved security measures.

Yahoo Mail, launched in 1997, was one of the first web-based email services on the internet. At its peak, Yahoo Mail had over 100 million users, but its popularity declined with the rise of Gmail. As of 2022, Yahoo Mail still maintains a significant user base, with around 225 million active users.

At its peak, AOL had over 20 million users, but its popularity declined significantly with the rise of broadband internet and other email services. As of 2022, AOL's email service has around 1.5 million active users.

Hotmail, launched in 1996, was one of the first free web-based email services on the internet. At its peak, Hotmail had over 300 million users, making it one of the most popular email services in the world. However, with the rise of Gmail and other email services, Hotmail's user base declined significantly.

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