The state of email apps 4th January 2013 by External Contributor Browse more infographics. Twitter LinkedIn Facebook Google+ External ContributorThis article has been contributed by another writer, blogger or website. The content is their copyright and represents their views.Other posts that might interest you:Are mobile medical apps good for our health? A new study by Research Now reveals that doctors and patients say 'yes'Five email marketing books that will boost your impact Five of the best books on email marketing to help you ensure that you make the most of this excellent opportunity for profits.What is the number one app you should use more than others? There is one app you should use more than any other. But which one is it? The result might surprise you.