Moving this from a downstream bug report:
https://bugzilla.redhat.com/show_bug.cgi?id=836518

libreport version: 2.0.10
abrt_version:   2.0.10
backtrace_rating: 4
cmdline:        evolution
crash_function: ews_sync_reply_cb
executable:     /usr/bin/evolution
kernel:         3.4.4-3.fc17.i686.PAE
time:           Пт. 29 июня 2012 11:48:41

The report doesn't contain detailed backtrace, but it's visible from the core backtrace what could be going on in the crashing thread:

core_backtrace:
:d4b42e0f3c16488781fadc22101b06c4c2199fb3 0x8537 ews_sync_reply_cb libeews-1.2.so.0 -
:d4b42e0f3c16488781fadc22101b06c4c2199fb3 0xecc0 ews_response_cb libeews-1.2.so.0 -
:c56c7cbec97e922af0fd58d36305646744a58ee9 0x43fee - libsoup-2.4.so.1 -
:c56c7cbec97e922af0fd58d36305646744a58ee9 0x44281 - libsoup-2.4.so.1 -
:c56c7cbec97e922af0fd58d36305646744a58ee9 0x41b08 soup_session_cancel_message libsoup-2.4.so.1 -
:d4b42e0f3c16488781fadc22101b06c4c2199fb3 0xefb6 ews_cancel_request libeews-1.2.so.0 -
:15beedcb299b506c9c6a09bdfed67a02095644a5 0xebbf g_cclosure_marshal_VOID__VOIDv libgobject-2.0.so.0 -
:15beedcb299b506c9c6a09bdfed67a02095644a5 0xd042 - libgobject-2.0.so.0 -
:15beedcb299b506c9c6a09bdfed67a02095644a5 0x26486 g_signal_emit_valist libgobject-2.0.so.0 -
:15beedcb299b506c9c6a09bdfed67a02095644a5 0x26e64 g_signal_emit libgobject-2.0.so.0 -
:d0b2ee750bf29544a82c25b03f3fe22086c6c4be 0x29495 g_cancellable_cancel libgio-2.0.so.0 -
:97fa69562a37264199975f74ef0f0694c2195d15 0x459d2 mail_reader_message_selected_cb libevolution-mail.so -
:15beedcb299b506c9c6a09bdfed67a02095644a5 0xf8da g_cclosure_marshal_VOID__STRING libgobject-2.0.so.0 -
:15beedcb299b506c9c6a09bdfed67a02095644a5 0xcd97 g_closure_invoke libgobject-2.0.so.0 -
:15beedcb299b506c9c6a09bdfed67a02095644a5 0x1ea3d - libgobject-2.0.so.0 -
:15beedcb299b506c9c6a09bdfed67a02095644a5 0x26ce1 g_signal_emit_valist libgobject-2.0.so.0 -
:15beedcb299b506c9c6a09bdfed67a02095644a5 0x26e64 g_signal_emit libgobject-2.0.so.0 -
:97fa69562a37264199975f74ef0f0694c2195d15 0x8da7d on_cursor_activated_idle libevolution-mail.so -
:4a18cece7105bb73a4f2c3ad540803eb237e7543 0x44a31 - libglib-2.0.so.0 -
:4a18cece7105bb73a4f2c3ad540803eb237e7543 0x46feb g_main_context_dispatch libglib-2.0.so.0 -
:4a18cece7105bb73a4f2c3ad540803eb237e7543 0x47390 - libglib-2.0.so.0 -
:4a18cece7105bb73a4f2c3ad540803eb237e7543 0x477f3 g_main_loop_run libglib-2.0.so.0 -
:ad9e27665744b5e0f27506032bcfd11acc11a16c 0x1859fd gtk_main libgtk-3.so.0 -
:df12a1e3d323853ce34c54ee5102ed22b29a1d9f 0x1cc3 main [exe] -