BTW: The selection box "Which topic best describes your question?" should be added another category: "I want to file a bug report". This is a bug report concerns Thunderbird on Android Version 9.0 running on a Samsung Note-3 running with Android 5.0: When I enter an email address, it often happens that TB crashes when the second letter of the adressse's name is entered. However, If I go to the address book and select the same user by his email address contained in it, I can write an email address to him, which I could not do the other way by directly entering the adressee's email adress into the appropriate field.