Hi, Joe,
Thanks for your help.
My windows is up to date and there is not patch available in Windows Update. I have already downloaded the latest driver from Intel website. The version is 17.1.1406.0472.
I have a Bluetooth speaker with build-in Mic. The speaker works fine but the Intel AC 7260 does not recognize the mic. I tested the speaker with several other brand Bluetooth devices. They all work fine. I am not sure what is missing.
Zhi