http://bugs.winehq.org/show_bug.cgi?id=11770
--- Comment #12 from Austin English austinenglish@gmail.com 2009-10-12 14:37:54 --- Owen recently did a lot of work on this: http://source.winehq.org/git/wine.git/?a=history;f=dlls/mapi32;hb=HEAD
I think this may be fixed now.