http://research.microsoft.com/en-us/um/people/gurevich/Opera/183.pdf
here is a bit of info!the short version is:
Our work significantly
improves upon previous protocols such as LBFS and
RSYNC in three ways
ya most think remote differential compression isnt powerfull?they re wrong!how to implement it?might need to check on ms website
http://msdn.microsoft.com/en-us/library/windows/desktop/aa372948(v=vs.85).aspx">http://msdn.microsoft.com/en-us/library/windows/desktop/aa372948(v=vs.85).aspx
but op you are right it would be nice if ms made a video about how to enable this cause with the web transfering terabyte of data only because i need a signature etc is kind of bad!