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.
EGroups
The service was started by Scott Hassan in 1997 as an email list archiving service called FindMail (mimicking the name "FindLaw", a company co-founded by Martin Roscheisen). Carl V. Page, Jr. joined the company in May 1997. When Martin Roscheisen joined as CEO in March 1998, FindMail was incorporated (in June 1998) and shifted its focus towards hosting email groups. FindMail, then renamed "eGroups", quickly grew to 250,000 users before taking a venture finance round of $810,000 from Atlas Venture in May 1998. In October 1998, with 1.2 million users (growing at 12,000 users per day), Excite offered to acquire the company for $40m but the company decided instead to take $5.1 million more investment money from Sequoia Capital. 
In Sept 1999, eGroups started work on an initial public offering but instead merged with ONElist, with 13 million users exchanging more than 1.3 billion email messages each month. In January 2000, the company raised a further $42 million and filed a S1 with the SEC on March 23, 2000.