I would like to migrate from Mozilla 1.3 to Thunderbird 0.5 as my primary email client, but I don't want to lose my old emails in the process. I attempted to use Thunderbird's Import feature, but all it listed was Netscape Communicator 4.x (which I migrated from a few years ago, the messages it imported were two years old).
Can anyone help? I've already switched to firefox as my browser because of its much smaller memory footprint than Mozilla (my system is an older one), and I'd like to make use of Thunderbird as well.