I've one for a while now. Not sure how they make money from it. It could be a sister project of something more bigger and profitable. Not sure. As it is still only beta it can be slow at times but it is good. One thing to remember it uses pop-ups to log in and out. These do not contain advertising it is just the way the login and out process was designed. Also it's been reported that it won't work on some portable devices (unlike gmail) not sure how true it is I haven't tried it yet.