Are you using <a href="https://support.mozilla.org/kb/difference-between-imap-and-pop3">POP accounts</a>? Unlike IMAP accounts, the only copy of your pop mail is in your local Thunderbird profile. If you want to add a POP account to beta, your options are:
Koristite li <a href="https://support.mozilla.org/kb/difference-between-imap-and-pop3">POP račune</a>? Za razliku od IMAP računa, jedina kopija vaše e-pošte nalazi se u vašem lokalnom Thunderbird profilu. Ako želite dodati POP račun u beta inačicu, vaše mogućnosti su: