5.3.4:
Customize your theme – Select a new
color scheme for your inbox. Screen too bright? Choose a darker
theme to dim your inbox.
Rename your accounts – Give your
accounts unique names like "Personal" or "Work" by long-pressing on
an account in the account switcher screen.
Create and manage subfolders in mobile –
now you can create, rename, and delete subfolders from your phone
or tablet.