As in version 4:4.5~20100920.1177660-1maemo1.1177547 , no default account is present, the user is forced to create one to work with "KDE Notes". When either "MailBox" or "Maildir" is chosen as the Account Type (in account wizards first step), the next screen shows "URL:" without the possibility to change the (empty) value. Touching the "Next" button leads to the "Setting up account..." progressbar, that remains at 1% or so. Clicking on "Details..." shows an nearly empty screen, then touching back does not lead back to the "Setting up account" screen, but instead to the "Personal Settings" screen with the empty-valued "URL:" field.
After multiple tries, the stdout/stderr reads as: " Designer: The set-type property mode could not be read. Kross: "TypeError: Result of expression 'page.widget().maildirPath.textChanged' [undefined] is not an object., line:40, backtrace: <anonymous>()@/usr/share/kde4/apps/akonadi/accountwizard/maildir/maildirwizard.es:40" Kross: "Error error=TypeError: Result of expression 'page.widget().maildirPath.textChanged' [undefined] is not an object. lineno=40 trace= <anonymous>()@/usr/share/kde4/apps/akonadi/accountwizard/maildir/maildirwizard.es:40" "QFormBuilder was unable to create a custom widget of the class 'KUrlRequester'; defaulting to base class 'QFrame'." Designer: The set-type property mode could not be read. Kross: "TypeError: Result of expression 'page.widget().maildirPath.textChanged' [undefined] is not an object., line:40, backtrace: <anonymous>()@/usr/share/kde4/apps/akonadi/accountwizard/maildir/maildirwizard.es:40" Kross: "Error error=TypeError: Result of expression 'page.widget().maildirPath.textChanged' [undefined] is not an object. lineno=40 trace= <anonymous>()@/usr/share/kde4/apps/akonadi/accountwizard/maildir/maildirwizard.es:40" "QFormBuilder was unable to create a custom widget of the class 'KUrlRequester'; defaulting to base class 'QFrame'." Designer: The set-type property mode could not be read. Kross: "TypeError: Result of expression 'page.widget().maildirPath.textChanged' [undefined] is not an object., line:40, backtrace: <anonymous>()@/usr/share/kde4/apps/akonadi/accountwizard/maildir/maildirwizard.es:40" Kross: "Error error=TypeError: Result of expression 'page.widget().maildirPath.textChanged' [undefined] is not an object. lineno=40 trace= <anonymous>()@/usr/share/kde4/apps/akonadi/accountwizard/maildir/maildirwizard.es:40" "QFormBuilder was unable to create a custom widget of the class 'KUrlRequester'; defaulting to base class 'QFrame'." Designer: The set-type property mode could not be read. Kross: "TypeError: Result of expression 'page.widget().maildirPath.textChanged' [undefined] is not an object., line:40, backtrace: <anonymous>()@/usr/share/kde4/apps/akonadi/accountwizard/maildir/maildirwizard.es:40" Kross: "Error error=TypeError: Result of expression 'page.widget().maildirPath.textChanged' [undefined] is not an object. lineno=40 trace= <anonymous>()@/usr/share/kde4/apps/akonadi/accountwizard/maildir/maildirwizard.es:40" "
Default account is created now and the Kolab account creation triggered from notes works fine as well, so no longer major. The actual cause for this is the lack of the KDE designer plugin for Kross on Maemo5/WinCE.