WLM 2012 won't retain Window size


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How can I get WLM 2012 to retain the last used Window size? I open the program maximised but every message/new mail in or out opens in a maximised window, even if the last one viewed or created has been in a 'Restored Down' size. I have to resize each time.
I seem to remember that earlier .ini files held this information, but.....