there is a new version of msn plus which apparantly works fine with msn6
thats like asking why the uxtheme patch file doesnt work with 2003 server - newer versions of software often use different coding to achieve same thing - MS would call it optimisation... joe user would say "if it aint broke dont fix it".
If microsoft really cared about people making add-ons, they wouldnt've released the code to the extent that they did.
but if ive had this conversation once, ive had it a million times...
it is basically a crack to make the program do something that it doesnt normally do - no cd crack for gta3... no advert crack for msn messenger - kinda the same thing imo... they both have the potential to reduce revenue for the software's manufacturers.