T420s external microphone won't work

I just bought a T420s, Type 4174-P5G, I want to use an external stereo microphone (Sony ECM-719) instead of the built-in microphone, however as soon as I plug it in the headphone/microphone combined jack, the microphone is recognized as headphone. Anyone has any idea how to make the external microphone work?
The sound card is named "Conexant 20672 SmartAudio HD" and I think I have latest driver correctly installed.
Any help will be appreciated.
T420s, Type 4174-P5G,
Solved!
Go to Solution.

So there is no way to use the external microphone without an adapter? That would be... quite inconvenient...
Alright, I wonder if I can find this thing online in UK? What's the model name of the adapter in your picture?
http://www.tvc-mall.com/uploads/details/IPHONE-4-7005-1.jpg
Thank you very much for the tip!
======edit=======
I think I found one but this looks like quite low quality (?)
http://www.amazon.co.uk/Steel-Series-50006-SteelSeries-Adapter/dp/B0035ER6GY/ref=sr_1_3?ie=UTF8&qid=...
I wonder if I can buy the apple counterpart online?

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T420s external microphone won't work

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