Using New Outlook on Windows for personal email, calendar, and contact management
That is not what people are trying to do. That brings multiple accounts into view but each of them has a separate Inbox, Junk Email, Drafts, etc. What is wanted is a single mailbox that combines all email accounts so that there is just one view with one Inbox, one Junk Email, one Drafts, etc. This type of feature already exists in the Android Outlook App (and other apps as indicated by replies here).