Ok, and to just share this works if you have multiple accounts, you just have to have the unified search folder already selected before you start removing layout opens. Then you will have all of your emails, BUT you want really know to which account they belong.
You do however get Calendar and tasks that are accessible via the menus.
Now in comparison, Geary does convergence well. Its UI seems to have been designed for that. The ONLY thing it is missing besides Calendar, Tasks, etc. is a unified inbox.