I HAVE INSTALLED THUNDERBIRD TO USE WITH MITCHELL 1 INVOICING PROGRAM AND WE NEED TO SEND INVOICES BY EMAIL SOMETIMES..I INSTALLED THUNDERBIRD WITH NO ISSUES BUT WHEN I PUT MY EMAIL ADDRESS IN IT SAYS USER NAME OR PASSWORD IS INCORRECT...WHEN I WENT TO MY EMAIL ACCOUNT FRUSTRATED..GMAIL HAD SENT ME AN EMAIL ABOUT PREFERENCES AND I CHANGED IT AND IT SHOULD WORK NOW BUT DOESNT...I AM TOTALLY FRUSTRATED WITH THIS..PLEASE HELP ME ...I CANT TAKE MUCH MORE...LOL .....LAURA