Where to start?  First, I would recommend you visit the Preview at http://windowslivepreview.com/hotmail/launch/?lang=en 

Then Start Exploring, here you will find the information on Hotmail and Messenger.

Why would this be exciting? The Hotmail offering is having the following pieces integrated:

  • ActiveSync
  • Office Web Apps integration
  • SkyDrive integration

Head on over, check it out.