The Focused Inbox is the keynote feature of the Outlook for iOS and Android mobile clients. All other clients in the Outlook family have used the Clutter feature, which processes mail on the server and removes unimportant items into the Clutter folder. Now Microsoft is dropping Clutter and introducing the Focused Inbox across the entire Outlook family. Rationalization and commonality is good, especially when features that really work are made available to all clients. Here’s how the changeover will occur.