Mozilla Connect

I just started using the Thunderbird Windows platform. In this current version of Thunderbird, I've noticed that the software doesn't provide us with suggestions while writing the recipient's email ID... I mean, we do have an option to save contacts ...

I wanted to delete all unread messages. Little did I know that Thunderbird only allows us to sort all read messages in ascending or descending order. This means that if I select all messages at once, I might delete all the read messages along with th...