Hi, In its current state in trunk, boost/exception/exception.hpp is generating regressions with MSVC 7.1 as shown in: http://tinyurl.com/yckdxrc The problem has to do with some (correct) member template friends declarations that MSVC 7.1 is not able to handle. Lines 222 and ff. of boost/exception/exception.hpp read: #if defined(__MWERKS__) && __MWERKS__<=0x3207 public: #else private: template <class E> friend E const & exception_detail::set_info( E const &, throw_function const & ); [...] To solve the problem the nicest solution would be to replace this by: #if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS) public: #else private: template <class E> friend E const & exception_detail::set_info( E const &, throw_function const & ); [...] But exception.hpp, presumably to speed up compilation times, does not include any other header, so seems like including <boost/config.hpp> just to get this macro could be unacceptable. If this is the case, I suggest that the code be changed so as to simply go public and omit the member template friend declarations altogether. Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo