--- comm-central/mailnews/mailnews.js.old	2009-09-23 13:57:22.281694000 +0800
+++ comm-central/mailnews/mailnews.js	2009-09-23 13:59:04.908429000 +0800
@@ -522,9 +522,9 @@
 // should we inhibit whitelisting of the domain for a server's identities?
 pref("mail.server.default.inhibitWhiteListingIdentityDomain", false);
 
-// to activate auto-sync feature (preemptive message download for imap) by default
-pref("mail.server.default.autosync_offline_stores",true);
-pref("mail.server.default.offline_download",true);
+// disable auto-sync feature (preemptive message download for imap) by default
+pref("mail.server.default.autosync_offline_stores",false);
+pref("mail.server.default.offline_download",false);
 
 // -1 means no limit, no purging of offline stores.
 pref("mail.server.default.autosync_max_age_days", -1);