Alister Whitford has a question today on the online forums about preserving white
space in a map. He thought that the functionality has changed between BizTalk 2006
and BizTalk 2006 R2. He has done a great job looking into stuff and it appears he
is right. You can check out he thread here: http://social.msdn.microsoft.com/Forums/en-US/biztalkgeneral/thread/7dd28a9b-16b5-4c0e-90db-843caf4689ee where
he also shows how not to preserve white space in R2 and thus have the same functionality
as in 2006 (non-R2).
Hope this helps someone