[boost] 1.35.0 - MSC8/9 error C2059: syntax error : '__is_abstract'

Hi I have problemes with the serialization since I updated to boost 1.35.0 Error: intrinsics.hpp # define BOOST_IS_ABSTRACT(T) __is_abstract(T) //<-error C2059: syntax error : '__is_abstract' # define BOOST_IS_CLASS(T) __is_class(T) //this one isn't syntax higloghted, maybe not defined, too. Any idea what's the matter? I checked out the head revision and it doesn't work two. Best, SirAnn