The Line-in jack dosn't work for microphones.

The line-in input can't power your normal 3.5mm plug jack microphone.
True or False?
I bought a headset microphone and plugged it into Line-in
and it won't work.

So if I'm correct there are no "mic inputs" because unless you have phantom power or a USB mic it won't work. Am i right or am i right?

You are correct.

it works with anything that has a powered input.

This is not correct. Please see my other post and reply. http://www.mac-forums.com/forums/showthread.php?t=80811