The February 2017 Release (build 17.0.17033.02) is live: http://mfcmapi.codeplex.com.
In our last hardware refresh, I had a chance to get a Surface Book, which was awesome, except for all the high DPI problems it exposed in MFCMAPI. So I fixed a bunch of those. Lemme know if you find any more.
I also fixed an issue that was reported about a dozen times, MAPI_E_INTERFACE_NOT_SUPPORTED trying to create a MSG file: https://github.com/stephenegriffin/mfcmapi/issues/9.