I have a couple of IMAP accounts in Outlook for Mac and they show up as separate folders in the unified Inbox - just as it should be. Now I added a POP account - and it does not show up as separate folder in the unified inbox. The emails are only visible when I click onto the Inbox folder icon as such, mixed up with all the other emails from all the other accounts.

Is this normal in Outlook for Mac or can there anything be done to fix this? (I'd like to add that when I do the same in Mail for OS X - adding a POP account to existing IMAP accounts - this POP account does get a separate folder in the unified inbox.