Just to counterbalance the other comments: I work in a less centrally controlled organization where I, and other users, have been using Focused Inbox in Outlook on our Android and iOS devices for months. The availability of a combination of a combined inbox for all accounts (I have six), and having Focused Inbox operate on the combined inbox has been the greatest sanity saver I have had in over 30 years of dealing with very high mail volumes. It frustrates me no end that (apparently) because my Outlook is tied to an Office 365 account, I cannot apparently turn on Focused Inbox in Windows Outlook, even as an Office 365 administrator. I realize that the iOS and Android apps were obtained by purchasing another company, and that their full functionality may not have been incorporated into Outlook, but it seems silly and rude that a functionality that has long been available in your free software is not available in either the front-end Outlook software or the back-end server that we pay for! Please tell me that I have missed something, and there is some workaround for this, and that there is some way, presumably implemented on the Outlook client, that does what I do in iOS and Android, that is, gives me a combined inbox across several Office 365 mail accounts and several more IMAP account, and applies Focused Inbox filtering to the combined box.