Android 4.0 slaps a slick new interface on top of the standard Gmail layout. You now get a two-line message preview and a context-sensitive toolbar, and can swipe left or right to dismiss messages. Business users will be glad to hear that Ice Cream Sandwich includes enhancements to its native e-mail app, such as auto-completion of recipients names and customizable quick responses.
The app also supports nested mail subfolders that can help you better organize IMAP and Exchange mail. Each subfolder supports its own synchronized rules set. The best part? The app finally includes server side search.