Sounds like it's going to take them some time before Microsoft is going to be able to profit from this, but it will probably be good for them in the long run. I was a bit surprised when I heard this, but I suppose it fits Microsoft. After all, Microsoft has been pretty active in the professional environment.
Personally, I'm happier than even that I don't have a LinkedIn account. I don't like Microsoft, so it's good I'll have nothing to do with them here. Also, I don't like big companies buying other big companies, because I don't see having less big individual companies a good thing. There's bound to be less competition eventually, and the big corporations end up controlling way too much.