Change the default sorting order in Thunderbird
I like my mails to be sorted by date, with the newest at the top and the oldest at the bottom. However, I prefer unread emails - no matter how old they are - to appear even higher on top than the newest read emails.
In Thunderbird 2 this was easily achievable by choosing "Read" as the sorting type and "Descending" as the order.
In Thunderbird 3, however, for some reason this has changed. If I choose "Read" as the sorting type, all messages will always be displayed oldest at the top, newest at the bottom. Changing between "Ascending" and "Descending" only changes whether the unread messages will be displayed above or below the read messages.
How can I set up Thunderbird so that it will display my inbox like this: