--- comm-1.9.2/mail/app/profile/all-thunderbird.js.check	2010-10-13 17:37:29.000000000 +0200
+++ comm-1.9.2/mail/app/profile/all-thunderbird.js	2010-10-20 02:56:53.000000000 +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.showPreviewText", true); // enables preview text in mail alerts and folder tooltips