I updated to KDE 4.8.4 and no kmail does not start:
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
kmail2(2417)/kdepimlibs (mailtransport): Could not access Outbox.
*** KMail got signal 11 (Exiting)
*** Dead letters dumped.
KCrash: Application 'kmail' crashing...
KCrash: Attempting to start /usr/lib64/kde4/libexec/drkonqi from kdeinit
sock_file=/home/AW/.kde4/socket-linux-nyil.site/kdeinit4__0
[1]+ Fertig kmail
To me this is rather serious, if there were no remedy, I’d have to go back to 4.7 or whatever was offered with openSuse 12.1.