Hi, Thunderbird was working fine in the morning, but later in the day, it suddenly stopped downloading messages from my Hotmail inbox and asked for my password again. When I entered my password, I got the following error message: "Sending of password for user mazyarm@hotmail.com did not succeed. Mail server pop-mail.outlook.com responded: Authentication failure: unknown user name or bad password." Thunderbird won't sign in to check emails. I also get the message: "Login to server pop-mail.outlook.com with username mazyarm@hotmail.com failed." And those are the messages I now get whenever I click on the Get Messages button. However, I am still able to access my Hotmail account directly using the Firefox web browser, so I know that my username and password are not the problem. Does anyone know what's going on? How do I solve this problem? Thank you, Maz