Careful. Old versions of internet-facing applications like email clients are dangerous and put you at risk. They often have widely known security issues which c

Careful. Old versions of internet-facing applications like email clients are dangerous and put you at risk. They often have widely known security issues which can allow malware to access your PC. I'd advise upgrading Thunderbird and ignoring the features you don't use, or switching to an actively-maintained mail client which is designed to be simpler than Thunderbird.