Thunderbird stopped downloading e-mail yesterday. I have an AT&T Yahoo configured POP account. It was working fine up until yesterday. No changes were made to the account settings. When I start Thurnderbird it says that it's sending Login information, then that it's Checking the Inbox for new messages, with a "flowing" green bar to the right (see image attached), but nothing downloads. I tried starting Thunderbird in safe mode... no change. I tried restarting the computer in safe mode... no change. I checked Firewall settings (Norton), but Thunderbird is shown with all permissions. I only switched to Thunderbird because Microsoft discontinued support for Windows Live Mail and I got a new computer and Thunderbird happened to have a function to import the .eml files from Live Mail. Help!