Thunderbird check all imap folders

With the latest thunderbird, the string to search for in the config editor to set it to check all folders for new email has changed from:

mail.check_all_imap_folders_for_new to mail.server.default.check_all_folders_for_new

As detailed here: http://kb.mozillazine.org/How_do_I_check_for_new_messages_in_other_fold… Which caught me out for a while as I was looking for the old one in the config editor.