pretty sure not in hotmail though there is probably some .NET API to do that?? yahoo I dont know, basically if you can configure your email client to grab mail from somewhere then you can use PHP to do the same but I assume yahoo is similar to hotmail?
MVC is the current buzz in web application architectures. It comes from event-driven desktop application design and doesn't fit into web application design very well. But luckily nobody really knows what MVC means, so we can call our presentation layer separation mechanism MVC and move on. (Rasmus Lerdorf)