Comment 69 for bug 320057

Issue persists with 45.5.1 on Windows 7 Professional, seems to happen more often since last auto upgrade. I experience a complete freeze of Thunderbird on a regular basis. I am not sure if it would recover after long enough waiting. I've waited maybe a minute. Longer wait times mean it is faster to restart and rewrite my changes since last auto-save. This is effectively a complete freeze, not a performance issue!