Yahoo! Mail
Yahoo! Mail is an email service launched in 1997 through the American parent company Yahoo!. Yahoo Mail provides four different email plans: three for personal use (Basic, Plus, and Ad Free) and another for businesses. By December 2011, Yahoo! Mail had 281 million users, making it the third largest web-based email service in the world. Since 2015 its webmail client also supports managing non-Yahoo e-mail accounts.
Oddpost
Oddpost was a pay-for webmail service, in 2002, that pioneered the use of JavaScript to mimic a desktop mail application, the first notable foray into using Ajax methodologies for webmail. Ajax techniques minimized the amount of data sent during an email session by sending "Datapacks" instead of reloading the whole interface on every click like a traditional webmail service (Hotmail, AOL). This made the service much faster, at the time, than its counterparts.