You can disable Focused Inbox and Outlook doesn't support it for most accounts anyway. From my usage Focused Inbox doesn't seem like that much of an algorithm,

You can disable Focused Inbox and Outlook doesn't support it for most accounts anyway. From my usage Focused Inbox doesn't seem like that much of an algorithm, it for the most part just seems follow similar rules that Gmail has used for things like the > and >> marks from very early in Gmail history: addressed to you and only you, no Listserv headers of any sort, is a known contact in your address bar. I check both tabs of course, but the primary usefulness of Focused Inbox I've found is in notification management. Lock screen notifications are limited to Focused Inbox, so I often read that "tab" at a glance on my lock screen (during Scheduled Summaries, these days) and reading the "Other Inbox" is closer to "regular email time". Also it's called "Focused Inbox" in part because it only affects the Inbox. Create your own folders and rules and they bypass the Inbox including Focused Inbox.