Today our users were moved to Focused Inbox when installing Office updates, including my account. I was not asked about Focused Inbox btw - it was just enabled for me (and Clutter was turned off).
We're re-enabled Clutter for all users since our users use mobile devices and the split-view that Focused Inbox uses does not reduce the 'clutter' in their inbox as the Clutter feature does.
With all makes of mobile devices being the primary access method there's needs to be a solution that works with them - not against them. And sorry, moving everyone off their native platform email apps to the Outlook mobile app is not the solution.
We'll keep Clutter enabled for as long as it works or until Focused Inbox is made to natively work with the iOS and Android email apps. As it is now, Focused Inbox completely fails for mobile users.