The message list pane can not be reduced below 10 messages, and the header area height is too much, also. My wife was happy with the amount email content she could see previously, but hates the new version. The message list size issue is known since July (four months!). It depends on a single number in the code, and yet this number has not been changed. My confidence in the Thunderbird team is badly shaken by something so irritating to so many, so easy to change, and still has not been changed. We both want to know when these issues will be corrected. I want to avoid the hassle and effort to teach her to use Outlook, so please tell me if the change is going to happen before December!