I did a little testing with a CSV file and Thunderbird. I exported my Collected Addresses folder as a CSV, opened it in Excel and removed all but the email addresses. I did Tools+Import in the Thundebird address book creating a new address book. Thunderbird like most software needed to have a name associated with the email address and used the portion of the email address before the "@" as the name. I created a new list and was able to drag and drop the addresses in to the list. Sam.