User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.1) Gecko/2008071615 Fedora/3.0.1-1.fc9 Firefox/3.0.1 Build Identifier: Since Thunderbird can handle more than one account, it is not desirable that "When new messages arrives" is the same for all accounts. Many may (I) have a company account, and a private account, and may not be interested in alert from both accounts. I therefore propose it is moved to Edit->Account Settings->"Server Settings". Notice that "Server Settings" it used as head line twice. That doesn't make sense. Naming the last to General would be better. See mock up. Reproducible: Always