New message alerts now appear as OS X notifications and can be found gathered in Notification Center. The ribbon bar remains though a few items in it have been shifted around.
It also discards the yellow theme from Outlook 2011 in favor of the blue and white tones Microsoft now favors for its Outlook products. In line with Apple’s Yosemite design, the new Outlook’s interface is flatter, uses gray more extensively than solid black, features slimmer fonts, and has removed the color from folder and mailbox icons in the sidebar. If you’re looking for a radical redesign in this version of Outlook you’ll be disappointed. There aren’t a load of new features in this version of Outlook.