Recently Thunderbird asked me to login again for Gmail. It presents me a form in which I have to insert the password. It is the same form as when I login to my Google account via my browser. Only the NEXT button does not work. Do you have an idea how to solve this?
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First, Thunderbird has it's own forum. https://support.mozilla.org/en-US/kb/get-community-support which is fine you can ask anywhere you wish.
Second, setup is no longer "simple." Read https://support.mozilla.org/en-US/questions/1201406 and if …