I've run a set of regression tests against Trunk with VC9 and the release MS TR1. Results are @ http://beta.boost.org/development/tests/trunk/developer/tr1.html, under the RW_WinXP_VC runner. A couple of observations: 1) The test_regex\std_test_regex tests are failing because basic_regex doesnt have an 'empty' member. However, the TR1 spec doesnt seem to say that it should? 2) The test file @ "libs/config/test/has_tr1_regex_fail.cpp" says: #ifndef BOOST_HAS_TR1_ARRAY #include "boost_has_tr1_regex.ipp" Shouldnt that be #ifndef BOOST_HAS_TR1_REGEX ? As far as the other failures go: some of them are 'by design' (e.g. is_base_of) due to MS following the current proposed spec rather than sticking to the TR1 draft, but others i'm not sure about (e.g. result_of). Anyone got any thoughts? Thanks, Richard Webb