There were many, one was this:
.\boost/log/detail/light_function_pp.hpp(59) : error C2248: 'boost::rv<T>::rv' : cannot access private member declared in class 'boost::rv<T>'
        with
        [
            T=boost::log::v2s_mt_nt5::aux::light_function<bool (const boost::log::v2s_mt_nt5::attribute_value_set &)>
        ]
        .\boost/move/core.hpp(75) : see declaration of 'boost::rv<T>::rv'
        with
        [
            T=boost::log::v2s_mt_nt5::aux::light_function<bool (const boost::log::v2s_mt_nt5::attribute_value_set &)>
        ]
        .\boost/log/detail/light_function_pp.hpp(56) : while compiling class template member function 'boost::log::v2s_mt_nt5::aux::light_function<SignatureT>::impl<FunT>::impl(const FunT &)'
        with
        [
            SignatureT=bool (const boost::log::v2s_mt_nt5::attribute_value_set &),
            FunT=boost::rv<boost::log::v2s_mt_nt5::aux::light_function<bool (const boost::log::v2s_mt_nt5::attribute_value_set &)>>
        ]
        .\boost/log/detail/light_function_pp.hpp(123) : see reference to class template instantiation 'boost::log::v2s_mt_nt5::aux::light_function<SignatureT>::impl<FunT>' being compiled
        with
        [
            SignatureT=bool (const boost::log::v2s_mt_nt5::attribute_value_set &),
            FunT=boost::rv<boost::log::v2s_mt_nt5::aux::light_function<bool (const boost::log::v2s_mt_nt5::attribute_value_set &)>>
        ]
        .\boost/log/detail/light_function_pp.hpp(157) : see reference to function template instantiation 'boost::log::v2s_mt_nt5::aux::light_function<SignatureT>::light_function<boost::rv<T>>(const FunT &)' being compiled
        with
        [
            SignatureT=bool (const boost::log::v2s_mt_nt5::attribute_value_set &),
            T=boost::log::v2s_mt_nt5::aux::light_function<bool (const boost::log::v2s_mt_nt5::attribute_value_set &)>,
            FunT=boost::rv<boost::log::v2s_mt_nt5::aux::light_function<bool (const boost::log::v2s_mt_nt5::attribute_value_set &)>>
        ]

And this:

    call "C:\Users\tomkent\AppData\Local\Temp\b2_msvc_8.0_vcvarsall_x86.cmd" >nul
cl /Zm800 -nologo @"bin.v2\libs\log\build\msvc-8.0\debug\address-model-32\build-no\link-static\log-api-winnt\runtime-link-static\threading-multi\core.obj.rsp"

...failed compile-c-c++ bin.v2\libs\log\build\msvc-8.0\debug\address-model-32\build-no\link-static\log-api-winnt\runtime-link-static\threading-multi\core.obj...
compile-c-c++ bin.v2\libs\log\build\msvc-8.0\debug\address-model-32\build-no\link-static\log-api-winnt\runtime-link-static\threading-multi\default_sink.obj
default_sink.cpp
.\boost/log/expressions/filter.hpp(107) : error C2036: 'boost::type' : unknown size

Full build results:

32 bit - http://pastebin.com/E3jkw44s

64 bit - http://pastebin.com/gASZ0nCn

Here's what I've got:
toolset     arch    compile install Link    Execute
msvc-8.0    32      FAIL    INPROG  X       X
msvc-8.0    64      FAIL    INPROG  X       X
msvc-9.0    32      X       INPROG  X       X
msvc-9.0    64      X       INPROG  X       X
msvc-10.0   32      X       INPROG  X       X
msvc-10.0   64      X       INPROG  X       X
msvc-11.0   32      X       INPROG  X       X
msvc-11.0   64      X       INPROG  X       X
msvc-12.0   32      X       INPROG  X       X
msvc-12.0   64      X       INPROG  X       X

Compile means that the b2 command completed without errors
Install means that the installers for the respective version were generated
Link means that visual studio was able to link a sample executable to a library (libboost_thread-vcXXX-mt[-gd]-1_XX.lib) generated
Execute means that the linked program executed without errors.

Tom Kent