Itam,
I've been looking into the issue myself, and don't see a quick fix for your issue. Adding WMP mood tags to a couple of my songs didn't seem to be detected by MC.
But, since there are only 12 moods and since each song can only have one, it should be possible to construct a work-around to easily add that mood data to MC.
Do you have a set system to how you store your songs on your hard drive? You could, from within WMP, move all the Angry songs to one directory, the Groovy to another, etc. Then, using MC, simply go into the Angry directory and tag all those songs with the appropriate mood.
If you don't want to move the files, it may be possible to create 12 playlists, one for each mood, and just tag all the songs in a specific playlist with that mood. But I'm not sure if WMP playlists are compatible with MC, so that may or may not be an option. You'd have to check with the higher-ups to see how MC deals with .WPL files.
I hope this helps.