Computers are annoying; there are, however, some ways in which they make our lives easier, which most of us who benefit from them take for granted. One such way is this: when you send someone an email, you retain a copy of it—unlike paper mail, where you have to make copies of your outgoing correspondence yourself. Email applications also organize your correspondence by thread (not just newest message first), which is extremely convenient but would be a pain to do by hand.
I had this thought while reading A Place for Everything, which talks about how people and businesses organized their piles of correspondence during the period (roughly from the late 19th century until email) when there was both a lot of it and it was all on paper.