Make WL Messenger remember the size of the input text box

Make WL Messenger remember the size of the input text box

Every time I (re)open a chat window in Windows Live Messenger (v2009/b14.0.8089.726), the input text box is scaled up to about 300 pixels in height, leaving little room for the conversation text box (I prefer moderately sized chat windows, not maximized); and I always have to resize it. Is there some way to force messenger to cooperate with me?