The method may further include displaying, on a display screen, the single message document according to {HEAD ~ a conversational view} based upon a perspective of the response level of {TAIL ~ a user} within the mail thread 
The method may further include displaying , on a display screen , the single message document according to { HEAD ~ a conversational view } based upon a perspective of the response level of { TAIL ~ a user } within the mail thread
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH