Earlier quoted context omitted.
There is a very strong network effect with Skype for PC to PC calls. But I doubt MS is going to get full value. They have had little success with freemium business models and I don't see why this would be different.
In what way do you measure success? Hotmail and Windows Live Messenger for two services have a huge amount of users.
I don't believe that they've ever broken that down publicly but it would seem unlikely that any one of those services is making significant money if the who division is losing cash.
10 years on (I think the Hotmail acquisition was that far back) it should be making money unless Microsoft has become a charity.