Windows Phone app services

Windows Phone app services

I've released about 2 months ago an app into the Windows Phone MarketPlace
and just yesterday I've released an update for the app. After the update
the app seems to ask for permission to access "Location services" and
"Microphone". While I understand why the app needs the location services,
it's really difficult to understand the Microphone part as I'm not using
the microphone anywhere... Could anyone give a logical explanation why
such a requirement was set in the MarketPlace and if there is any way to
remove it as I actually don't access the microphone in the app?
In case anyone is wondering my app is wrote for WP 7.5 as well...
Thank you in advance!
Andrei