A:AnswerYes. Compatible with macos. Just plug it in. That's all. Then you'll be ready to use apps like Skype and Zoom. It's very easy to set up and use.
A:AnswerIt does have a mic and it works very well for my zoom calls. In regards to the OS, logitech website says windows 7 and up. So you should be fine.
A:AnswerI sometimes use a headset with a microphone when using the camera. When I plug it into my PC, it takes over the microphone function and turns off the microphone in the camera.