One of the main reasons I've used third party mail apps such as Mailbox for such a long time is because the stock iOS Mail app has never made it easy to use archive and trash simultaneously. Sometimes I don't want to archive an email, I want to delete it. And other times I want to archive but not delete. If I can't have both options conveniently at my fingertips, that doesn't work for me. Luckily, iOS 8 brings swipe options that actually let archive and trash play nice together for the first time. You've just got to change a few settings first!
Full story from the iMore Blog...