You have a mailing list in the Thunderbird Address Book and you want to send this list to a friend. Does this friend also use Thunderbird? Are you OK with sending the full contact information for each of the persons on just that mailing list? Address, phone, etc? If so, select the named list in the left pane of the Address Book. 'Tools - Export' Name the file and point the file explorer to desktop. Save in LDIF format Send him an email and include the file as an attachment. Tell him to import the file into his address book. --- If he has Outlook, he probably will not be able to import your Thunderbird list. ''Microsoft and Mozilla do not play well together'' You can export it as a .CSV file and save it to your desktop. He might be able to import the file into Outlook, MAYBE... If he can't get the file into his Outlook, he can always open the file with Notepad and copy the email addresses into his Contacts, one by one. TB-38.2 Win10-PC