06.01.2009, 00:00:55
From what I recall, the features that were backported were to do with network security such as implementing additional encryption algorithms and to enable better integration with a Server 2008/Vista environment. Not what I would call "a lot of code from vista". Backported also doesn't mean copied verbatim either. SP3 may indeed have some compatibility problems with some hardware/software combinations, but I think its a stretch to blame it on vista code as though XP had been made more vista like.