An mp3 encoder will only convert to mp3, not aac.
I am surprised that nobody responded sooner, perhaps they were put off by the topic.
I think what people were put off by is the fact that aac is not mentioned anywhere in any of the documentation for MC.
If you do a google search for wma to aac converter you will find no mention of MC and there are several free solutions.
Maybe I am overly suspicious of people but my first thought was here is someone trying to figure a way to get MC for free.
Does it make sense that someone would buy something that is available as a trial without first testing whether it will perform
the desired action.