If I'm reading an email and I accidentally hit archive, how can I undo this?
It used to be simple: I could use the back button and there was a "move to inbox" menu item. Failing that, I believe one could drag the inbox label to the open message. Now, the only way I see available is to search for the message so that it appears in a list, and then drag that message to the inbox label. Is there any option for un-archiving while actively displaying the message? This comes up fairly often.