Can I revert to an older version so I can run mailmerge?
I was using an older version of Thunderbird and Mail Merge. Thunderbird updated itself to a version that won't allow Mail Merge I want to revert to an older version of Thunderbird. Will I lose my present addresses and e-mail history?
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- User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36
duplicate here https://support.mozilla.org/en-US/questions/1266720