Everything they do is a knockoff of something else, and it's usually not better (I actually cannot think of a single case where it is better). I am not just randomly anti-Microsoft for religious reasons. They make terrible products that have horrendous user experiences. They do not innovate. In general, I have heard they hire sub-par programmers.

All of this is exaggerated in their internet initiatives. Who uses Hotmail anymore? Who used MSN, which they abandoned for Live? Who uses Live? Why would they try to compete against Flash with Silverlight? What gives them the authority or experience to do such a thing?

And if you asked me which were the two most horrendous monstrosities of popular websites on the internet, I would say PlentyOfFish and MySpace. They are the two sites which have the least sense of design, ergonomics, usability, and general respect.

Why, then, should I trust that they would make good decisions on their backend code and server software?