Using New Outlook on Windows for personal email, calendar, and contact management
My bad! Actually it is not working. I realized that I had set up automatic email forwarding from my other accounts to my default email account in Outlook.
Another thing I noticed is that if you have only one Inbox in Favorites, it will just show as Inbox. That's why I thought it was a unified Inbox. Once I added other Inboxes to Favorites, they show up as Inbox (acct1), Inbox (acct2), etc.
Bummer! We definitely need this feature.