S/MIME - Now available in Current Channel version 16.45 (21011103) The New Outlook comes with several limitations. Panels are also collapsible so it makes Outlook for Mac a lot more customizable for the main view of emails. Reading and writing emails have been improved with single-line views, a new mail compose UI, and even a feature to ignore emails. It’s a hybrid of Apple’s macOS design and Microsoft’s own Fluent design. Microsoft’s Ribbon interface has been removed, and everything looks simplistic. The new design includes Microsoft’s Fluent icons, rounded corners, and changes to make the email app ready for future updates. Microsoft has launched a New Outlook for Mac OS.