Shoutbox

Or if he has Messenger Plus! Live a script can certainly do this depending on the current signed in user email.

code:

---

var oEmails = {
                'email1@hotmail.com' : 'the new name',
                'email2@hotmail.com' : 'another new name'
               }
function OnEvent_ContactListWndCreated() {
    var oTitle = Interop.Allocate(oEmails[Messenger.MyEmail].length*2+2);
    Interop.Call('user32', 'SetWindowText', Messenger.ContactListWndHandle, oTitle.DataPtr);
}

---