This is also good to know if you regularly experience some type of lag while using your computer. A lot of times when your computer connects out to the net, it pulls in more than it can handle at a time. And then your computer becomes very slow or bogged down. And if you have your mail client set to auto update. It could happen while it is running in the background and you will be sitting there looking at screen wondering what happened. This is a great way to avoid headaches like that.