Drag and drop? Surely you have better things to do, or is that the Windows way of doing the task? ;-)
Seriously, this is a case for automating. IIRC you currently have Thunderbird mail files, which are in mbox format. Use your favorite search engine to look for "mbox to imap".
Drag and drop? Surely you have better things to do, or is that the Windows way of doing the task? ;-)
Seriously, this is a case for automating. IIRC you currently have Thunderbird mail files, which are in mbox format. Use your favorite search engine to look for "mbox to imap".