The very first thing you should do is to change the Audio Controller in VirtualBox. Below is a setting that worked for me:
Windows will complain about not finding a suitable audio driver but if you know that all you need is to install a "Realtek AC'97 Driver" for "Windows 7" then you will find http://www.ac97audiodriver.com
After installing the driver followed by a Windows restart you should be able to setup the microphone using the "configure/setup microphone wizard" options. If you get into troubles make sure "properties/advanced" show as default format "2 channels, 16 bit, 44100 Hz (cd quality)" as shown below:
I have read on the web the suggestion that this setting should match the host settings which you can set from the "Audio MIDI Setup" application. I have tried different combinations and it still works, the important thing is to rerun the setup microphone wizard to make sure distortion is kept to a minimum. In any case I left mine with the below settings:
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