Rated 4 out of 5 stars

Great to have Mark All As Read working in Thunderbird 68.3.1. Invaluable. Works from the drop down menu on the toolbar. Is there a way of getting a Mark All Read button onto the toolbar rather than in a drop down menu?

Rated 5 out of 5 stars

As for the moment: It just works (TB 68.3.1 (32-Bit) German version), thank you very much!