Tried to change port settings, but that did not work. Chatted with comcast, but they couldn't fix the problem. Made it worse by suggesting that I delete old account and reestablish a new one. Deleting old account made it worse by removing my large inbox. New account message from Thunderbird is that it "failed to find the settings for your email account." In addition, the error console has this message "Timestamp: 4/6/2015 11:51:08 AM Warning: mutating the [[Prototype]] of an object will cause your code to run very slowly; instead create the object with the correct initial [[Prototype]] value using Object.create Source File: resource://gre/components/steelApplication.js Line: 783" Tries to reestablish using POP instead of changing to IMAP. Same message. see image