The improvements will be available over the coming days for Web-based mail as well as on Windows 8, Apple and Android mobile devices.
"We've redesigned the new version of Yahoo! Mail with speed in mind - getting through your emails is faster than ever before," Mayer said. "We've also made your inbox more intuitive and easier to navigate, allowing you to focus on what matters most: your messages. And, because mobile is everything these days, Yahoo! Mail now has a consistent look and feel across devices."