With the new build of MFCMAPI a few things have been moved around. One common one which gets a lot of administrators is "Modify Extra Properties". If you are following a product manual and it has asked you to select an object then "On the Property pane menu, click Modify Extra Properties" you are properly scratching your head.
The "Modify Additional Properties" field has now been renamed to "Additional properties...". Simply select this instead then follow the rest of your instructions as normal.
The next screen is the same as previous versions of MFCMAPI.
Follow your documentation from here as normal.
The purpose of this article is to clarify this step in existing documentation. MFCMapi is a dangerous tool and if administrators do not know what they are doing they can cause serve damage.