Microsoft is definitely not looking at this short term. When they talk about a billion devices they are talking about being everything to everybody. So my guess

Microsoft is definitely not looking at this short term. When they talk about a billion devices they are talking about being everything to everybody. So my guess would be that they would want my mom and everyone else all to use it. The other point about the "mom" argument is directly related to the "facebook login" issue, where complexity is not anything that anyone wants to deal with.