I use Opera Mail as my primary email agent on Windows XP Pro SP3. Soon I will install Windows 7, but first I am trying to set up Thunderbird. (I already use Firefox.) I have >4500 email messages in my Opera Mail store, and I have not been able to figure out how to import them into TB. In Opera Mail, for each mailing list and label (view) I want to import into TB, I first exported each from Opera to a *.mbs file in a single Windows directory. Now I have numerous *.mbs files, one for each mailing list or label. I want to import them into separate TB folders. How can I accomplish this? I have been looking at the Mozilla support pages online and can find nothing. Or am I going about it all wrong? Thank you.