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For my mac Pro? It would help me out a lot. Any way it could work?

Short answer no. There is no analog pass through.

Slightly longer answer -- you might be able to rig it with a sound capture progam so you got out the headphone jack what was coming in the mic, and then run a 3.5mm to 3.5mm stereo cable over to the MacPro. But why? If it is for recording, you'd be far and away better to record directly to a file on the portable, then move the file over.

But... Why go through all of this when you can get a real external mic cheaply enough?

May help a bit if you gave us some kind of inkling of what you are trying to accomplish.
 
Just want to audio chat with friend. Nothing high quality. I'm just not sure where I'd find a mic compatible with Mac.
 
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