For Windows
Locate ThunderBird profile file
C:\Users\<username>\AppData\Roaming\Thunderbird\Profiles\lt3w6e1m.default\Mail\mail.xxxyyyzzz.com
Add or change general.useragent.override:
// To set the user-agent string to whatever you desire. Following are a
// few examples. Although you can do this, I would recommend using
// something like a user agent switcher
user_pref("general.useragent.override", "Mozilla/5.0 (X11; U; Linux i686; en-US; rv 0.9.2) Gecko/20010726 Netscape6/6.1");
user_pref("general.useragent.override", "Mozilla/5.0 (compatible; MSIE5.5; Windows 98;");
user_pref("general.useragent.override", "Mozilla/4.0 (compatible;)");
Reset ThunderBird.
cf. http://www.bifzi.com/hiddenprefs/
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