OE doesn't control this, the application used to open (read) the attachment
does (e.g., Word, PictureIt!). If you resize the smaller window per http://www.mvps.org/inetexplorer/answers.htm#new_window_max, its size
/should/ be remembered...but YMMV.
--
HTH...Please post back to this thread
~Robear Dyer (aka PA Bear)
MS MVP-Windows (IE/OE), AH-VSOP