''kcjim [[#question-1120488|said]]'' <blockquote> change message, thunderbird is not responding, change email account, thunderbird is not responding, reply to message thunderbird is not responding everytime an update appears thudderbird goes to shit not responding and just plain not working WHY? </blockquote> The most usual cause is anti virus programs. Create an exception in your for the Thunderbird profile folder and turn off email scanning in the anti virus product. Anti virus look here https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues For other not responding issues look here https://wiki.mozilla.org/Thunderbird:Testing:Memory_Usage_Problems