Wow, in just two weeks, 10 million users. This is something to keep a watch on: http://www.engadget.com/2012/08/14/outlook-com-hits-10-million-users-in-just-two-weeks/
If you remember, I posted about this 2 weeks ago HERE when they got 1 million users in the first 6 hours. So it appears they are growing quite a bit.