Original: Webmail ( or Web-based e-mail ) is an e-mail service intended to be primarily accessed via a web browser , as opposed to through a desktop e-mail client ( such as Microsoft Outlook , Mozilla 's Thunderbird , or Apple Inc. 's Mail ) .
Simplified: Webmail ( or Web-based e-mail ) is an e-mail service which is usually accessed through a web browser , instead of an email client such as Microsoft Outlook .