You know, I'm a developer and not a business type, so when I see a headline like this, my immediate first thought is "isn't email a solved problem? Aren't there already a ton of providers for this type of service?"

So imagine my surprise that someone is raising millions of dollars to have another whack at it.

It's always good to be reminded that solving big, new problems isn't necessarily more important to people than solving small, existing problems better.