Hi There is a link error with boost::serialization::free_saver in the serialization 1.32 lib under vc7.1. The workaround put in place for vc7.0 (BOOST_MSVC 1300) should also apply to vc7.1 (BOOST_MSVC 1310) Index: split_free.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/serialization/split_free.hpp,v retrieving revision 1.4 diff -u -r1.4 split_free.hpp --- split_free.hpp 4 Aug 2004 05:23:40 -0000 1.4 +++ split_free.hpp 16 Sep 2004 22:17:23 -0000 @@ -34,7 +34,7 @@ namespace serialization { -#if ! BOOST_WORKAROUND(BOOST_MSVC, <= 1300) +#if ! BOOST_WORKAROUND(BOOST_MSVC, <= 1310) template<class Archive, class T> void save(Archive &ar, const T & t, const unsigned int); template<class Archive, class T> Regards. Francis ANDRE