what is this new Mapguide Opensource ?

Hi,

 

I did not under stand why the mapserver people has changed its name from Mapserver to Map guide ?.Why i should go for Mapguide viewer?, If i am working with DWF as well as HTML viewer fine?.atcullay i want to Know what the main difference between Mapguide & MapServer Opensource ?

Any one please explain abt it?

 

Rajesh