Very Computer

Hello!
KMail has three "panes": folder list, messages list and message window
(sometimes also MIME window).
My KDE saves my session window.
Always when I start up KDE, KMail appears on my 1. virtual desktop. But
message window is too small. I catch its edge and make it bigger.
When I close KMail and start it again, it remembers my position of elements
in KMail. But when I exit KDE and start it again, mentioned pane in KMail
is small, so I have to make it bigger ....
How can I change that?
KDE 3.1 debs from Karolina.
Regards,
Robert