The new Outlook. It has all the things browser-Outlook has had for a while, like a calendar board view, to organise your day on a canvas. Tasks, meetings, notes, links, all visible from one board. Pin items to top of Inbox to easily find them later. Drag messages into the To Do list to create tasks. Snooze messages to deal with them later.
https://modernworkmentor.com/blog/one-outlook-should-you-start-using-it