http://bugs.winehq.org/show_bug.cgi?id=7342
--- Comment #39 from Bryan Christ bryan.christ@gmail.com 2008-03-10 17:36:26 --- I'm by no means an expert on licensing, but I thought it was possible to link against a piece of GPL3 software without repercussion:
"The “Corresponding Source” for a work in object code form means all the source code needed to generate, install, and (for an executable work) run the object code and to modify the work, including scripts to control those activities. However, it does not include the work's System Libraries, or general-purpose tools or generally available free programs which are used unmodified in performing those activities but which are not part of the work."
If I understand this correctly, it should be okay to link to and unmodified version of libmapi, run whatever function, and return.