MSN Messenger is an instant messaging program that lets you send instant messages to your friends, and much more.
MSN Messenger is a tool for chat online, in real time, with friends, family, and colleagues. It's faster than e-mail, more discreet than a phone call, and best of all – it's free! MSN Messenger is more than just text, it™s a great way to collaborate with co-workers or touch base with family and friends. You can even send an instant message to a contact™s mobile phone. Customization features help you personalize your chats and make your connections even more meaningful.

The program will even notify you when someone you are communicating with is typing so you can avoid overlapping messages. MSN Messenger also offers integration with Outlook Express. You can visit chat rooms and join in, arrange your contacts into groups, select emoticons from a drop-down list, and get quick access to all of MSN Messenger's features with a single click.