I'm compiling and linking using VC++ 9.0, and using Boost libraries built with VC++ 8.0. Unresolved external link errors are returned. Has anyone else had this problem? I'm going to build the Boost libraries using VC++ 9.0, for use with VC++ 9.0, but I was wondering if anyone else has tried to migrate to VC++ 9.0, and how they handled it. An example of the link error is below. 28>libboost_unit_test_framework-vc80-mt-gd.lib(xml_report_formatter.obj) : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall std::_Container_base::~_Container_base(void)" (__imp_??1_Container_base@std@@QAE@XZ) referenced in function "protected: void __thiscall std::vector<struct std::pair<char,char const *>,class std::allocator<struct std::pair<char,char const *> > >::_Tidy(void)" (?_Tidy@?$vector@U?$pair@DPBD@std@@V?$allocator@U?$pair@DPBD@std@@@2@@std@@IAEXXZ) David Hartman