Google added another Labs feature called Multiple Inboxes in Gmail. This feature makes it possible for users to have more than one ‘inbox‘ in their default Gmail view. The look of Gmail changes so that you have your traditional inbox on the left and then a right pane with the emails you want (or need) to see separately.
It doesn’t mean that you will see inboxes of added Mail accounts in different panes. It is implied to simply place the results from various filters and search queries off to the side of your main in-box which shows starred and draft messages by default. Now you can make it work to show mail boxes of other added email accounts to Gmail in diferent panes on right hand side of main Inbox using the small tweak
