Our computer keeps freezing up while using Mozilla Thunderbird. We finally took it to the Computer Doctor who cleaned it up and it ran fine at his place for 24 hours while he had it hooked up to the internet the whole time. We got it back and it worked fine for a couple of hours until we were in our company email (Mozilla Thunderbird) for a while and it locked up again and again always in Mozilla and requiring us to hard boot the computer and start over. Frustrating. Not being able to get help from a person on the phone is even more frustrating. Using a different computer to contact you now.