Outlook

Today we are announcing the new Outlook for the Mac, which delivers improved performance and reliability and a fresh look and feel that is unmistakably Microsoft Office. This release offers a more familiar and consistent experience between Outlook on the PC, Outlook on the web and Outlook Web App (OWA) for iPad, iPhone and Android devices.

http://blogs.office.com/2014/10/31/new-outlook-mac-available-office-365-customers/