I'm going to (re-)use this thread as I'm building Boost 1.34.0 with MSVC .NET 2003 (7.1 SP1) as well. I'm building with the same copy of BJAM as I used to build 1.33.1 with. I've created a user-config.jam file containing a single line: using msvc : 7.1 ; I'm doing the build from the MSVC .NET command prompt which I think should have all of the compiler's settings already. The build command I'm using is: E:\FOST.3\external\boost_1_34_0>bjam --toolset=msvc --prefix=.\install\basic "-sBUILD=debug release <runtime-link>dynamic <threading>multi" install I seem to be getting a lot of warnings and a couple of errors, but they're not hanging around for long enough to capture. I can try to capture them if anybody wants to see what they are. In the install directory in this path: E:\FOST.3\external\boost_1_34_0\install\basic\include\boost-1_34\boost\compatibility\cpp_c_headers I get a .svn directory which shouldn't be there. I seem to remember this happening with 1.33.1 as well but don't know for sure now. We're currently just using the header libraries (mostly smart pointers) so I'm not going to see any link problems. I also have yet to start doing any form of testing on the results of compiling our applications with 1.34.0. K