After Kontact has crashed, if you click "Restart Application" from DrKonqi, it will give you a scary warning message about losing data because "Kontact already seems to be running on another display on this machine."
Git commit 5550ea281af323a8191a22e38a7c0360f3d4a9a4 by Montel Laurent. Committed on 10/12/2012 at 09:01. Pushed by mlaurent into branch 'master'. Fix Bug 296114 - Kontacts complains it is already running when restarting from DrKonqi FIXED-IN: 4.10 Lock file is not necessary now in akonadi. We access to mail from resources which are able to be access by several program. M +4 -0 kmail/kmstartup.cpp http://commits.kde.org/kdepim/5550ea281af323a8191a22e38a7c0360f3d4a9a4