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.
Hightail
Throughout 2008, YouSendIt added plugins that allowed files to be sent through YouSendIt from within applications like Final Cut Pro, Microsoft Outlook, and Adobe Acrobat. In May of that year, a new release of Yahoo! Mail included YouSendIt built-in, which added a million YouSendIt users over the following two months. In July, YouSendIt's online folder management system and digital signing features were introduced in order to compete with Dropbox. The following month, YouSendIt added applications for Mac and PC desktops, as well as iOS and Android devices.