The July 2011 Release (build 188.8.131.527) is live: http://mfcmapi.codeplex.com.
This round, the focus was on bulking up MrMAPI’s feature set. MrMAPI is one of the core data collection tools being used in a future update to our Software Diagnostics Platform for Outlook issues. This has driven several of the features I’ve added to MrMAPI to make it easier for the engineers writing the diagnostics to grab the bits of information they need so we can resolve issues faster.
Here's a change list - see the Issue Tracker on Codeplex for more details, or look at the code:
There is a typo in your post: June 2011 Release must be July 2011 Release.