Veteran technology columnist Walt Mossberg, writes: Like radio, email isn't dying, it's just changing. Over the past decade or so it's become much more like postal mail. It's not the place you expect to find a greeting from a friend or even a timely update from a professional colleague. Instead, it's a mix of junk mail you hate and discard, plus bills and missives from businesses you also hate but can't discard. [...] Still, despite all signs to the contrary -- and many predictions -- email is not dead. In fact, some analyses suggest that it's growing. Few people can afford to be without it. It hasn't expired; it has morphed. There are lots of reasons email persists, even as faster and simpler forms of communication proliferate and your personal communications likely have mostly migrated elsewhere. But one big one is that new types of media channels rarely totally kill off old ones, even though everyone predicts they will. The old ones just adapt and change. Back in the day, television was supposed to kill off radio, but radio gradually saved itself by dropping the programming TV did better (like dramas and variety shows) and starting to focus on playing hit songs and hosting political and sports talk shows. I think something similar is going on with email. Once the king of digital discourse, email has surely been dethroned by an army of alternatives: Vast and numerous messaging services; photo- and video-oriented sharing on social networks or the photo apps of Apple and Google; business tools like Slack. I get the latest pictures of my granddaughter through iCloud photo sharing. I get the latest discussions of how we plan to cover stories on The Verge or Recode through Slack. My editor and I collaboratively edit my stories inside Google Docs. Ten years ago, all those things would have been done via email. Back then, when a reader wanted to tell me I was an idiot (or worse) for something I wrote, I got an email. Now, they tell me on Twitter.