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Calendar installed itself after I blocked it

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I had Thunderbird set up to never install calendar and now it updated and installed it anyway. What do I need to do to uninstall it and block it from getting installed ever again, permanently, forever, until the end of the universe?

I had Thunderbird set up to never install calendar and now it updated and installed it anyway. What do I need to do to uninstall it and block it from getting installed ever again, permanently, forever, until the end of the universe?

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LIghtning is considered part of Thunderbird now, so new installs will include it and enable it for sure.

Are you saying you remove and then when updating it' s reinstalled automatically without confirmation ?