User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1.1) Gecko/20090715 Firefox/3.5.1 Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1.1) Gecko/20090715 Lightning/1.0pre Thunderbird/3.0b3 I use the vertical view. When I resize the horizontal size of the message list pane, it gets reset to very (unusable) small after a restart. Reproducible: Always Steps to Reproduce: 1. Select Vertical View 2. Resize message list pane by dragging the vertical divider 3. Restart Thunderbird Actual Results: Message list pane is resized unusable small Expected Results: Size of message list pane (and message pane) should be remembered and restored.