I hope I'm not the only one annoyed at this bug: 1. New iCloud mail arrives 2. Badge appears on both Mail apps (iOS and Mac), as expected 3. Mark it as read on Mac, badge clears, as expected 4. Bug: badge doesn't clear on iOS unless you open the app Yes, I've submitted numerous bug reports to Apple. If you too are affected by this most annoying bug, please report it to Apple.