On 01/18/2015, Thunderbird installed update 31.4.0. Ever since then, Thunderbird will not connect to any of my mail servers. I have mail servers from my ISP and from a web hosting company. When trying to retrieve mail from my web hosting (MAPI) I get the error message "Could not connect to mail server; the connection was refused". When I try to retrieve mail from my ISP server, Thunderbird just hangs with a message at top of the widow that says (Not Responding) and I have to go into the task manager to kill the process. All mail accounts were working fine until the update on 01/18/2015.