Got tired of the start screen email app real quick, went out and downloaded windows essential pack which includes mail.
Program is a work of art, added all my accounts with just a couple of clicks, personal imap accounts, microsoft accounts and even my yahoo pop account (needs to be yahoo mail plus account, which i have for like $20 a year).
Each account has its own set of folders and each account can be given a color, the ribbon menus on top are great and offer multiple options for your emails.
Reader can be completely customized with many different views, custom column headers, etc.
Can all this be synced to other accounts, and devices who knows, I really am not into that so for me this is the perfect email app
get the free download here: Windows Essentials: Other Programs