--- mail/app/profile/all-thunderbird.js~	2011-08-14 20:46:03.941257205 +0200
+++ mail/app/profile/all-thunderbird.js	2011-08-14 20:46:03.956257025 +0200
@@ -177,7 +177,7 @@
 pref("xpinstall.whitelist.add", "addons.mozilla.org");
 pref("xpinstall.whitelist.add.36", "getpersonas.com");
 
-pref("mail.shell.checkDefaultClient", true);
+pref("mail.shell.checkDefaultClient", false);
 pref("mail.spellcheck.inline", true);
 
 pref("mail.biff.alert.show_preview", true);