Do I need a separate microphone or is the built in webcam mic okay?

Built in webcam microphones have improved significantly and are adequate for casual meetings. However, they pick up more background noise and room echo than a dedicated USB microphone or a headset. If you take frequent client calls or record content, a separate mic is worth the investment. For occasional team meetings, the built in mic on a quality webcam like the Logitech C920 is perfectly fine.