RESOLVED IN MY APPLICATION
In my application, I was trying to send an email whose message body was typed by the user in text area. When mail was send, outlook automatically removed line break entered by user.
e.g if user entered
Yadav
Mahesh
outlook displayed it as
YadavMahesh
Resolution: I changed the line break character "\r\n" with "\par " ( remember to hit space at the end of RTF code "\par" )and line breaks are restrored.
Cheers,
Mahesh