My first experience with this concept was in the late nineties called something like Crushmail. Here are some Hacker News threads about similar implementations

My first experience with this concept was in the late nineties called something like Crushmail. Here are some Hacker News threads about similar implementations: http://news.ycombinator.com/item?id=3602033 http://news.ycombinator.com/item?id=3602033 http://news.ycombinator.com/item?id=2908151 http://news.ycombinator.com/item?id=2908151