GND is ground! 0V line so that one can be plugged in simply. Mic Vcc i would imagine is power for the mic, Vcc standing for Voltage Conventional Current (in that it flows from negative to positive) so i would guess at mic_bias or power! GUESS remember, i could easily be wrong! that leaves mic N to Mic. Im not sure on front/rear audio lines. Just guess and try a few, you should be pretty safe that you aint gunna blow you board!!!
let us know how you get on and which ones go to which