Automessage is a new plug-in or generic complement for
Windows Live Messenger or
MSN Messenger instant messaging clients. It is an especially practical utility if you spend a lot of time on-line with your messaging client but can“t talk with your contacts.
Automessage sends a response message automatically when you are, for example, in "Busy" mode and some of your contacts start a conversation with you. In other words, an answer machine.
Although it is an add-on, Automessage is completely free and very small, just 2 or 3kb.