kontact addressbook on kmail imap

Hallo there

every now and then I try to use my addressbook on my imap server. int 
the old KDE3 days there were major problems with german umlauts, so I 
delyed the use. Now I tried it again.

Usually I let my kontact start automatically at login on my first 
desktop. Without selected imap resources this works as expected. With 
imap addressbook resource kmail is started as single seperate 
application before kontact. If I click on the corresponding mail icon 
within kontact the seperate kmail instance is shown.

If I terminate (ctrl-q) the kmail instance an click on kontacts mail 
icon the embeded kmail instance is startet. 

Is there something I can config, that avoids starting the seperate 
kmail instance?

Martin