DCTF
New member
I suppose that would be an ok compromise. Have them all in one unified folder structure for people that like to scroll back through a folder list to inbox. While allowing you to pin a specific inbox to Start so people who like the current way can always get to new mail with just one press.
The option to split to tiles is definitely better. Myself, I like the way Outlook is forming into a single system, with the Calendar accessible in the same place you choose different inboxes. If anything, I'd like more integration there: a single Outlook Live Tile rotating between Calendar's date and appointments and Mail's message count and latest message header.