-Every time I start Thunderbird, I see my emails from 2009 at the top instead of auto-scrolling down to the newest. -When opening a MAPI email with a recipient email, the last letter of the email address is cut off in its fancy drawn box. -The form displaying conversations should automatically expand the tree, or at least have an option for that, and auto-expand the tree on a single result. Also, the ">" sign is not prominent enough to indicate that there are more emails in the result resulting the most confusions on workplaces. It's just simply a bad design.

thank you