Microsoft Live Messenger is one of the most popular messenging programs. Microsoft product screen shot reprinted with permission from Microsoft Corporation. When an e-mail response isn't fast enough -- or you just want to hang out online with friends, instant messaging (IM) may be your best option. And Windows Live Messenger is the messaging service of choice for many who chat worldwide. Windows Live Messenger is just one component of the integrated Windows Live communications suite launched by Microsoft Corp. in 2006.