Most microphones packaged with computers today are cheap throwaways.
A quality headset microphone will give you improved performance when using a voice recognition or Internet telephony program. With a headset, the microphone can be positioned close to the mouth at a fixed distance for consistent vocal quality. In recent years, noise-cancellation technologies have improved the microphone. Some common forms of background interference include loud radios, people chatting nearby, or air conditioning systems. Adding noise-cancellation to a good microphone promises to improve the quality of voice recognition and computer phone calls.