My email which functions under Mozilla Thunderbird (which was created Jan 28, 2018 - yes that is 2018) has begun to "freeze". I cannot do simple filing of messages or delete batches of emails. I went to HostCentric and cleared out the webmail version of all of my emails, hoping that this would "fix" my problem. It did not. I do not know if my version Thunderbird should have been updated in the past or not. If I were to update my version of Thunderbird, would my existing email address remain in tact? Or do I have to back everything up in order to preserve my email "world"? I do NOT want to lose my email address and all of the inbox contents or sub-folder files. My email is how I manage and communicate with my lawyer, accountant, summer rental property etc. Help? Nancy D