Version:           1.10.1 (using 4.1.1 (KDE 4.1.1), Kubuntu packages)
Compiler:          gcc
OS:                Linux (i686) release 2.6.24-19-generic

It does it nearly every time.

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[KCrash handler]
#6  0xb7ef2410 in __kernel_vsyscall ()
#7  0xb6b0b085 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb6b0ca01 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb76a2367 in qt_message_output () from /usr/lib/libQtCore.so.4
#10 0xb76a2458 in qFatal () from /usr/lib/libQtCore.so.4
#11 0xb76a2505 in qt_assert () from /usr/lib/libQtCore.so.4
#12 0xb198f206 in ?? () from /usr/lib/kde4/lib/libkmailprivate.so.4
#13 0xb198d3e8 in ?? () from /usr/lib/kde4/lib/libkmailprivate.so.4
#14 0xb192d4d6 in ?? () from /usr/lib/kde4/lib/libkmailprivate.so.4
#15 0xb192d545 in ?? () from /usr/lib/kde4/lib/libkmailprivate.so.4
#16 0xb192ccc3 in KMail::AccountManager::~AccountManager ()
   from /usr/lib/kde4/lib/libkmailprivate.so.4
#17 0xb19dbb56 in KMKernel::cleanup ()
   from /usr/lib/kde4/lib/libkmailprivate.so.4
#18 0xb1d30110 in ?? () from /usr/lib/kde4/lib/kde4/kmailpart.so
#19 0xb7edcf3e in Kontact::MainWindow::~MainWindow ()
   from /usr/lib/kde4/lib/libkontactprivate.so.4
#20 0xb77a49ac in qDeleteInEventHandler () from /usr/lib/libQtCore.so.4
#21 0xb77a5c5c in QObject::event () from /usr/lib/libQtCore.so.4
#22 0xb6eb450f in QWidget::event () from /usr/lib/libQtGui.so.4
#23 0xb720ca55 in QMainWindow::event () from /usr/lib/libQtGui.so.4
#24 0xb7cf3d7f in KMainWindow::event () from /usr/lib/kde4/lib/libkdeui.so.5
#25 0xb7d2f64c in KXmlGuiWindow::event () from /usr/lib/kde4/lib/libkdeui.so.5
#26 0xb6e5cf9c in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#27 0xb6e61ce8 in QApplication::notify () from /usr/lib/libQtGui.so.4
#28 0xb7c3b1c3 in KApplication::notify () from /usr/lib/kde4/lib/libkdeui.so.5
#29 0xb77960b9 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#30 0xb7797469 in QCoreApplicationPrivate::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#31 0xb779768d in QCoreApplication::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#32 0xb77c162f in ?? () from /usr/lib/libQtCore.so.4
#33 0xb563ddd6 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#34 0xb5641193 in ?? () from /usr/lib/libglib-2.0.so.0
#35 0xb564174e in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#36 0xb77c19f8 in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#37 0xb6ef0a25 in ?? () from /usr/lib/libQtGui.so.4
#38 0xb77978f9 in QCoreApplication::processEvents ()
   from /usr/lib/libQtCore.so.4
#39 0xb7e56c0f in KPIM::KAddrBookExternal::addAddressee ()
   from /usr/lib/kde4/lib/libkdepim.so.4
#40 0xb7e572a9 in KPIM::KAddrBookExternal::addEmail ()
   from /usr/lib/kde4/lib/libkdepim.so.4
#41 0xb1a6f966 in KMMailtoAddAddrBookCommand::execute ()
   from /usr/lib/kde4/lib/libkmailprivate.so.4
#42 0xb1a704f8 in KMCommand::slotPostTransfer ()
   from /usr/lib/kde4/lib/libkmailprivate.so.4
#43 0xb1a7060d in KMCommand::qt_metacall ()
   from /usr/lib/kde4/lib/libkmailprivate.so.4
#44 0xb1a71572 in KMMailtoAddAddrBookCommand::qt_metacall ()
   from /usr/lib/kde4/lib/libkmailprivate.so.4
#45 0xb77aaf79 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#46 0xb77ab642 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#47 0xb1a580b3 in KMCommand::messagesTransfered ()
   from /usr/lib/kde4/lib/libkmailprivate.so.4
#48 0xb1a702ca in KMCommand::transferSelectedMsgs ()
   from /usr/lib/kde4/lib/libkmailprivate.so.4
#49 0xb1a717e5 in KMCommand::slotStart ()
   from /usr/lib/kde4/lib/libkmailprivate.so.4
#50 0xb1a705f7 in KMCommand::qt_metacall ()
   from /usr/lib/kde4/lib/libkmailprivate.so.4
#51 0xb1a71572 in KMMailtoAddAddrBookCommand::qt_metacall ()
   from /usr/lib/kde4/lib/libkmailprivate.so.4
#52 0xb77aaf79 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#53 0xb77ab642 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#54 0xb77b1ab7 in ?? () from /usr/lib/libQtCore.so.4
#55 0xb77b1bdc in ?? () from /usr/lib/libQtCore.so.4
#56 0xb77a59fa in QObject::event () from /usr/lib/libQtCore.so.4
#57 0xb6e5cf9c in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#58 0xb6e61bf9 in QApplication::notify () from /usr/lib/libQtGui.so.4
#59 0xb7c3b1c3 in KApplication::notify () from /usr/lib/kde4/lib/libkdeui.so.5
#60 0xb77960b9 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#61 0xb77c3c01 in ?? () from /usr/lib/libQtCore.so.4
#62 0xb77c14a0 in ?? () from /usr/lib/libQtCore.so.4
#63 0xb563ddd6 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#64 0xb5641193 in ?? () from /usr/lib/libglib-2.0.so.0
#65 0xb564174e in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#66 0xb77c19f8 in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#67 0xb6ef0a25 in ?? () from /usr/lib/libQtGui.so.4
#68 0xb779533d in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#69 0xb77954cd in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#70 0xb779774d in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#71 0xb6e5c897 in QApplication::exec () from /usr/lib/libQtGui.so.4
#72 0x0804b326 in _start ()
#0  0xb7ef2410 in __kernel_vsyscall ()