I intend to add my Yahoo Mail account as a pop3 account to my old Gmail. In GMail > Settings > Accounts & Import > Add a POP3 mail account you own. I mentionned my Yahoo account settings but I got the following error message :  Server denied POP3 access for the given username and password.Server returned error: [AUTH] Access to this service is not permitted. Any idea ? Why it is not permitted ? is Google & Yahoo not permitting stuffs like that anymore ?  
Not Permitted - adding Yahoo Mail as a pop3 account to Gmail?
gmail;yahoo mail;pop3
Yahoo doesn't allow for POP access without their premium services. They do however offer it if you sign up for Yahoo Plus services.   Yahoo! Mail Plus 