I was horrified to receive an e-mail from mail.com, telling me that my e-mail service would effectively be withdrawn in about 3 weeks unless I upgraded TLS 1.0 to TLS 1.1. I barely understand what that means but I have done my best to comply, short of buying a new computer. I have queried the usual sources, which tell me that if I upgrade Thunderbird to the latest version all will be well, so I tried to implement some of the often contradictory advice offered - to no avail. When I started, About Thunderbird informed me that I was running version 68.10.0 (64- bit). After trying all that I could understand, About Thunderbird tells me that my Linux 18.3 (Sylvia) computer is still running version 68.10.0 (64- bit). I suppose that's a bit better than screwing the whole thing up - but not a lot. My update 'shield' icon continues to show a green tick and assures me that my system is up to date. I appear to have disappeared up my own tail pipe. If some kind soul would explain how I can extricate myself from this impasse I would be exceedingly grateful.