This happened once before, then started working again for a few months and now doing it again. When I start up Thunderbird the emails will not load. I keeps saying "not responding." After around five minutes or so a couple of emails will load and then it's back to "not responding." Then another few or more minutes of waiting and another couple of emails download and back to "not responding." This goes on for hours. Tonight I have been waiting for eight hours and I'm still waiting with no end in sight. I can't do anything else with email until it finishes. This is very frustrating. Can you help?