It provides a beautiful interface for email, as well as some really cool new features like quick view categories that are programmed to automatically highlight all attachments with doc or pic attachments, but also shipping updates, bills, social updates, etc. It's also directly integrated with office web apps, skydrive (which is fantastic btw), the people app, and soon a new calendar application. It pulls your contacts from facebook, linkedin, gmail, Hotmail, live messenger, twitter. you can post directly to facebook walls or send facebook chat. And it unifies all your contacts into single contact cards so that if you've got someone stored separately in gmail and fb, you see them once and can communicate with them in multiple ways. Skydrive is Microsoft's cloud storage app that will ship with windows 8 and office 2013. basically, if you save your docs to sd they'll be available anywhere, including on your phone. Want to send a large file via email? instead you'll send a sd link (and the email client will suggest it automatically if it's to big for regular email). Anyway, it's worth checking out. I've been a gmail user for the last several years but I decided to ditch it for this which I find a lot more useful overall.