looking better, I think you need to tweak the format bar in chat window
Dunno if this is possible but it would be great if you kept it the same as it currently is in Messenger, because currently it looks a bit dodgy tbh coming from the left hand side and having the vista orb
So my proposal is, keep it the same as in messenger currently BUT add a sexy aero look to it
EDIT:
Also that's a pretty hefty border and gap between the Message Pane and the Display pictures, perhaps this can be altered some way or removed
see screenshot for the default vista window borders if you still decide to keep them