Neither my Yahoo Calendar nor my Gmail Calendar synch with Thunderbird version 78 on Windows 10.
I moved to Thunderbird and Lighting hoping for great calendar synching. Well, Mail is synching. Two factor setup was used for Yahoo. However, yahoo calendar is not syncing, nor is Google calendar - either to Google or from Google.
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Note that as of Oct. 10, TbSync for TB 78 has been withdrawn until several bugs are fixed.
https://addons.thunderbird.net/en-us/thunderbird/addon/tbsync/reviews/1163776/