diff -u exchange-provider-for-lightning/js/calExchange.js .thunderbird/dgbjy48b.default/extensions/lightning-exchange-provider@gitorious.org/js/calExchange.js
--- exchange-provider-for-lightning/js/calExchange.js	2010-09-28 05:54:43.229653377 -0700
+++ .thunderbird/dgbjy48b.default/extensions/lightning-exchange-provider@gitorious.org/js/calExchange.js	2010-09-30 09:05:00.317836158 -0700
@@ -493,9 +493,10 @@
 		var flags = {};
 
 		var invite = aNewItem.getProperty("X-SOR-INVITE") || this.isInvitation(aNewItem);
+		var me = this.getInvitedAttendee(aNewItem);
 
-		if (invite === true) {
-			var me = this.getInvitedAttendee(aNewItem);
+                // only if we're updating a meeting
+		if ((invite === true) && (me.participationStatus)) {
 
 			if (me.participationStatus == "DECLINED")
 				del = true;
diff -u exchange-provider-for-lightning/js/soapout.js .thunderbird/dgbjy48b.default/extensions/lightning-exchange-provider@gitorious.org/js/soapout.js
--- exchange-provider-for-lightning/js/soapout.js	2010-09-28 14:37:42.080891543 -0700
+++ .thunderbird/dgbjy48b.default/extensions/lightning-exchange-provider@gitorious.org/js/soapout.js	2010-09-30 06:31:22.959697045 -0700
@@ -844,6 +844,8 @@
 		"DECLINED"	: <t:DeclineItem xmlns:t={t}/>
 	};
 
+        sdbg("aResp is " + aResp);
+
 	r = responseMap[aResp];
 	r.t::ReferenceItemId.@Id = aItem.getProperty("X-ITEMID");
 	r.t::ReferenceItemId.@ChangeKey = aItem.getProperty("SEQUENCE");
Only in exchange-provider-for-lightning/js: .svn