When you're in gmail and you want to see the message you JUST replied to someone with an email, it shows it to you inline with all of the received messages from that person. It's a real thread. You can see who replies and you can also keep up with what you send. Mail in iOS is NOT threaded email. If I reply to an email and I then want to review the message I sent to someone, I must exit the inbox, then scroll down to the accounts tab, then click on any one of the three accounts I have, then find the "send" tab, and hope to figure out which email I was replying to when I sent that message. It's horribly inefficient. Even further, on iOS' Mail if you reply to a message or forward a message, all you can see is a little arrow showing a forward or a "curled" arrow implying a reply...but there is no way to see that reply inline with the emails you're receiving. Above all, this is my BIGGEST pet peeve with iOS 6 mail. Way bigger than the lack of labels, or bigger than the fact that exchange emails don't play nice with notification center. Only being able to view messages you receive from a contact is NOT threaded messaging. Threads incorporate what you send out as well. The desktop/web version of gmail does this. The Gmail app for iOS does this. Apple's Mail, does not.