reviewed by: Chenthill Palanisamy <pchenthill@novell.com>

2007-08-13  Suman Manjunath  <msuman@novell.com>

        reviewed by: Chenthill Palanisamy  <pchenthill@novell.com>

        * gui/dialogs/event-page.c: (event_page_init),
        (sensitize_widgets), (get_current_account),
        (event_page_fill_widgets), (event_page_fill_component),
        (existing_attendee), (event_page_set_info_string),
        (get_widgets),
        (source_changed_cb), (init_widgets),
        (event_page_select_organizer),
        (event_page_construct):
        * gui/dialogs/event-page.glade:
        * gui/dialogs/memo-page.c: (memo_page_init),
        * (sensitize_widgets),
        (memo_page_fill_widgets), (get_current_account),
        (memo_page_fill_component), (memo_page_set_info_string),
        (get_widgets), (source_changed_cb), (init_widgets),
        (memo_page_select_organizer), (memo_page_construct):
        * gui/dialogs/memo-page.glade:
        * gui/dialogs/task-page.c: (task_page_init),
        * (sensitize_widgets),
        (get_current_account), (task_page_fill_widgets),
        (task_page_fill_component), (existing_attendee),
        (task_page_set_info_string), (get_widgets), (source_changed_cb),
        (init_widgets), (task_page_select_organizer),
        (task_page_construct):
        * gui/dialogs/task-page.glade: Add a label on the top to show
        * information string 
        for calendar, task and memo editors. It would be shown while
        operating on subscribed user's folder items.
         * gui/itip-utils.c: (itip_send_comp), (reply_to_calendar_comp):
        * A utility function sanitize_component has been removed. The sentby
        parameter is set in the event pages.                                                                                       
        --This line, and those below, will be ignored--

M    calendar/gui/dialogs/task-page.glade
M    calendar/gui/dialogs/task-page.c
M    calendar/gui/dialogs/task-page.h
M    calendar/gui/dialogs/event-page.glade
M    calendar/gui/dialogs/memo-page.glade
M    calendar/gui/dialogs/event-page.c
M    calendar/gui/dialogs/event-page.h
M    calendar/gui/dialogs/memo-page.c
M    calendar/gui/dialogs/memo-page.h
M    calendar/gui/itip-utils.c
M    calendar/ChangeLog

svn path=/trunk/; revision=33996

9 files changed, 662 insertions, 90 deletions

diff --git a/calendar/gui/dialogs/event-page.c b/calendar/gui/dialogs/event-page.c
index de1048c793..d9c16556e3 100644
--- a/calendar/gui/dialogs/event-page.c
+++ b/calendar/gui/dialogs/event-page.c
@@ -70,6 +70,11 @@ struct _EventPagePrivate {
 	GtkWidget *main;
 	BonoboUIComponent *uic;
 
+	/* Generic informative messages placeholder */
+	GtkWidget *info_hbox;
+	GtkWidget *info_icon;
+	GtkWidget *info_string;
+
 	GtkWidget *summary;
 	GtkWidget *summary_label;
 	GtkWidget *location;
@@ -177,6 +182,9 @@ static void hour_sel_changed ( GtkSpinButton *widget, EventPage *epage);
 static void minute_sel_changed ( GtkSpinButton *widget, EventPage *epage);
 static void hour_minute_changed ( EventPage *epage);
 static void update_end_time_selector( EventPage *epage);
+static void event_page_select_organizer (EventPage *epage, const char *backend_address);
+static void set_subscriber_info_string (EventPage *epage, const char *backend_address);
+
 G_DEFINE_TYPE (EventPage, event_page, TYPE_COMP_EDITOR_PAGE);
 
 /* Class initialization function for the event page */
@@ -236,6 +244,10 @@ event_page_init (EventPage *epage)
 	priv->categories = NULL;
 	priv->sod = NULL;
 
+	priv->info_hbox = NULL;
+	priv->info_icon = NULL;
+	priv->info_string = NULL;
+
 	priv->deleted_attendees = g_ptr_array_new ();
 
 	priv->comp = NULL;
@@ -576,7 +588,6 @@ clear_widgets (EventPage *epage)
 	e_dialog_editable_set (priv->categories, NULL);
 
 	gtk_entry_set_text (GTK_ENTRY (GTK_COMBO (priv->organizer)->entry), priv->default_address);
-	
 }
 
 static gboolean
@@ -821,6 +832,11 @@ sensitize_widgets (EventPage *epage)
 		gtk_box_pack_start ((GtkBox *)priv->status_icons, priv->alarm_icon, FALSE, FALSE, 6);
 	}
 	
+	/* The list of organizers is set to be non-editable. Otherwise any 
+	 * change in the displayed list causes an 'Account not found' error. 
+	 */
+	gtk_editable_set_editable (GTK_EDITABLE (GTK_COMBO (priv->organizer)->entry), FALSE);
+
 	gtk_editable_set_editable (GTK_EDITABLE (priv->summary), !read_only);
 	gtk_editable_set_editable (GTK_EDITABLE (priv->location), sensitize);
 	gtk_widget_set_sensitive (priv->alarm_box, custom);	
@@ -952,7 +968,7 @@ get_current_account (EventPage *epage)
 		EAccount *a = (EAccount *)e_iterator_get(it);
 		char *full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);
 
-		if (!strcmp (full, str)) {
+		if (!g_ascii_strcasecmp (full, str)) {
 			g_free (full);
 			g_object_unref (it);
 
@@ -978,6 +994,7 @@ event_page_fill_widgets (CompEditorPage *page, ECalComponent *comp)
 	ECalComponentDateTime start_date, end_date;
 	const char *location, *uid = NULL;
 	const char *categories;
+	gchar *backend_addr = NULL;
 	ESource *source;
 	GSList *l;
 	gboolean validated = TRUE;
@@ -1026,11 +1043,17 @@ event_page_fill_widgets (CompEditorPage *page, ECalComponent *comp)
 	}
 	e_cal_component_free_text_list (l);
 
+	e_cal_get_cal_address (COMP_EDITOR_PAGE (epage)->client, &backend_addr, NULL);
+	set_subscriber_info_string (epage, backend_addr);
+
 	if (priv->is_meeting) {
 		ECalComponentOrganizer organizer;	
-		
+
 		priv->user_add = itip_get_comp_attendee (comp, COMP_EDITOR_PAGE (epage)->client);	
 
+		/* Organizer strings */
+		event_page_select_organizer (epage, backend_addr);
+
 		/* If there is an existing organizer show it properly */
 		if (e_cal_component_has_organizer (comp)) {
 			e_cal_component_get_organizer (comp, &organizer);
@@ -1039,7 +1062,7 @@ event_page_fill_widgets (CompEditorPage *page, ECalComponent *comp)
 				gchar *string;
 				GList *list = NULL;
 				
-				if (itip_organizer_is_user (comp, page->client)) {
+				if (itip_organizer_is_user (comp, page->client) || itip_sentby_is_user (comp)) {
 					if (e_cal_get_static_capability (
 								page->client,
 								CAL_STATIC_CAPABILITY_ORGANIZER_NOT_EMAIL_ADDRESS))
@@ -1079,20 +1102,31 @@ event_page_fill_widgets (CompEditorPage *page, ECalComponent *comp)
 			if (a != NULL) {
 				/* Reuse earlier declared *page, or rename this to avoid confusion? */
 				CompEditorPage *page = (CompEditorPage *) epage;
+
 				priv->ia = e_meeting_store_add_attendee_with_defaults (priv->model);
 				g_object_ref (priv->ia);
 
-				e_meeting_attendee_set_address (priv->ia, g_strdup_printf ("MAILTO:%s", a->id->address));
-				e_meeting_attendee_set_cn (priv->ia, g_strdup (a->id->name));
+				if (!(backend_addr && *backend_addr) || !g_ascii_strcasecmp (backend_addr, a->id->address)) {
+					e_meeting_attendee_set_address (priv->ia, g_strdup_printf ("MAILTO:%s", a->id->address));
+					e_meeting_attendee_set_cn (priv->ia, g_strdup (a->id->name));
+				} else { 
+					e_meeting_attendee_set_address (priv->ia, g_strdup_printf ("MAILTO:%s", backend_addr));
+					e_meeting_attendee_set_sentby (priv->ia, g_strdup_printf ("MAILTO:%s", a->id->address));
+				}
+
 				if (page->client && e_cal_get_organizer_must_accept (page->client))
 					e_meeting_attendee_set_status (priv->ia, ICAL_PARTSTAT_NEEDSACTION);
 				else
 					e_meeting_attendee_set_status (priv->ia, ICAL_PARTSTAT_ACCEPTED);
 				e_meeting_list_view_add_attendee_to_name_selector (E_MEETING_LIST_VIEW (priv->list_view), priv->ia);
 			}
+
 		}
 	}
 
+	if (backend_addr) 
+		g_free (backend_addr);
+
 	/* Start and end times */
 	e_cal_component_get_dtstart (comp, &start_date);
 	e_cal_component_get_dtend (comp, &end_date);
@@ -1452,13 +1486,18 @@ event_page_fill_component (CompEditorPage *page, ECalComponent *comp)
 			e_cal_component_add_alarm (comp, ca);
 		}
 	}
-	
+
 	if (priv->is_meeting) {
 		ECalComponentOrganizer organizer = {NULL, NULL, NULL, NULL};
 
 		if (!priv->existing) {
 			EAccount *a;
-			gchar *addr = NULL;
+			gchar *backend_addr, *org_addr = NULL, *sentby = NULL;
+			
+			e_cal_get_cal_address (priv->client, &backend_addr, NULL);
+			
+			/* FIXME need not set Organizer strings here */
+			event_page_select_organizer (epage, backend_addr);
 
 			/* Find the identity for the organizer or sentby field */
 			a = get_current_account (epage);
@@ -1476,13 +1515,23 @@ event_page_fill_component (CompEditorPage *page, ECalComponent *comp)
 				return FALSE;
 			} 
 
-			addr = g_strdup_printf ("MAILTO:%s", a->id->address);
+			if (!backend_addr || !g_ascii_strcasecmp (backend_addr, a->id->address)) {
+				org_addr = g_strdup_printf ("MAILTO:%s", a->id->address);
+				organizer.value = org_addr;
+				organizer.cn = a->id->name;
+			} else {
+				gchar *sentby = NULL;
+				org_addr = g_strdup_printf ("MAILTO:%s", backend_addr);
+				sentby = g_strdup_printf ("MAILTO:%s", a->id->address);
+				organizer.value = org_addr;
+				organizer.sentby = sentby;
+			}
 
-			organizer.value = addr;
-			organizer.cn = a->id->name;
 			e_cal_component_set_organizer (comp, &organizer);
 
-			g_free (addr);
+			g_free (backend_addr);
+			g_free (org_addr);
+			g_free (sentby);
 		}
 
 		if (e_meeting_store_count_actual_attendees (priv->model) < 1) {
@@ -1710,19 +1759,27 @@ existing_attendee (EMeetingAttendee *ia, ECalComponent *comp)
 {
 	GSList *attendees, *l;
 	const gchar *ia_address;
+	const gchar *ia_sentby = NULL;
 	
 	ia_address = itip_strip_mailto (e_meeting_attendee_get_address (ia));
 	if (!ia_address)
 		return FALSE;
 	
+	if (e_meeting_attendee_is_set_sentby (ia))
+		ia_sentby = itip_strip_mailto (e_meeting_attendee_get_sentby (ia));
+
 	e_cal_component_get_attendee_list (comp, &attendees);
 
 	for (l = attendees; l; l = l->next) {
 		ECalComponentAttendee *attendee = l->data;
 		const char *address;
+		const char *sentby = NULL;
 		
 		address = itip_strip_mailto (attendee->value);
-		if (address && !g_ascii_strcasecmp (ia_address, address)) {
+		if (attendee->sentby)
+			sentby = itip_strip_mailto (attendee->sentby);
+
+		if ((address && !g_ascii_strcasecmp (ia_address, address)) || (sentby && !g_ascii_strcasecmp (ia_sentby, sentby))) {
 			e_cal_component_free_attendee_list (attendees);
 			return TRUE;
 		}
@@ -2169,6 +2226,23 @@ event_page_set_show_categories (EventPage *epage, gboolean state)
 	}
 }
 
+/*If the msg has some value set, the icon should always be set */
+void 
+event_page_set_info_string (EventPage *epage, const gchar *icon, const gchar *msg)
+{
+	EventPagePrivate *priv;
+
+	priv = epage->priv;
+
+	gtk_image_set_from_stock (GTK_IMAGE (priv->info_icon), icon, GTK_ICON_SIZE_BUTTON);
+	gtk_label_set_text (GTK_LABEL(priv->info_string), msg);
+
+	if (msg && icon) 
+		gtk_widget_show (priv->info_hbox); 
+	else 
+		gtk_widget_hide (priv->info_hbox); 
+}
+
 /* Gets the widgets from the XML file and returns if they are all available. */
 static gboolean
 get_widgets (EventPage *epage)
@@ -2224,6 +2298,10 @@ get_widgets (EventPage *epage)
 	priv->location = GW ("location");
 	priv->location_label = GW ("location-label");
 
+	priv->info_hbox = GW ("generic-info");
+	priv->info_icon = GW ("generic-info-image");
+	priv->info_string = GW ("generic-info-msgs");
+
 	priv->invite = GW ("invite");
 	priv->add = GW ("add-attendee");
 	priv->remove = GW ("remove-attendee");
@@ -2649,6 +2727,22 @@ source_changed_cb (GtkWidget *widget, ESource *source, gpointer data)
 			else
 				event_page_hide_options (epage);
 
+			if (client) {
+				gchar *backend_addr = NULL;
+
+				e_cal_get_cal_address(client, &backend_addr, NULL);
+				
+				if (backend_addr && *backend_addr) {
+
+					if (priv->is_meeting)
+						event_page_select_organizer (epage, backend_addr);
+
+					set_subscriber_info_string (epage, backend_addr);
+				}
+
+				g_free (backend_addr);
+			}
+
 			sensitize_widgets (epage);
 
 			alarm_list_dialog_set_client (priv->alarm_list_dlg_widget, client);
@@ -2656,6 +2750,24 @@ source_changed_cb (GtkWidget *widget, ESource *source, gpointer data)
 	}
 }
 
+
+static void
+set_subscriber_info_string (EventPage *epage, const char *backend_address)
+{
+	ECal *client = COMP_EDITOR_PAGE (epage)->client;
+	ESource *source;
+	
+	source = e_cal_get_source (client);
+	
+	if (e_source_get_property (source, "subscriber"))
+		/* Translators: This string is used when we are creating an Event 
+		   (meeting or appointment)  on behalf of some other user */
+		event_page_set_info_string (epage, GTK_STOCK_DIALOG_INFO, 
+				g_strdup_printf(_("You are acting on behalf of %s"), backend_address));
+	else
+		event_page_set_info_string (epage, NULL, NULL);
+}
+
 static void
 alarm_changed_cb (GtkWidget *widget, gpointer data)
 {
@@ -2831,6 +2943,9 @@ init_widgets (EventPage *epage)
 					   (EDateEditGetTimeCallback) comp_editor_get_current_time,
 					   epage, NULL);
 
+	/* Generic informative messages */
+	gtk_widget_hide (priv->info_hbox);
+
 	/* Summary */
 	g_signal_connect((priv->summary), "changed",
 			    G_CALLBACK (summary_changed_cb), epage);
@@ -3021,6 +3136,65 @@ init_widgets (EventPage *epage)
 
 
 
+static void
+event_page_select_organizer (EventPage *epage, const char *backend_address)
+{
+	EventPagePrivate *priv;
+	EIterator *it;
+	EAccount *def_account;
+	EAccount *a;
+	gboolean subscribed_cal = FALSE;
+	ESource *source = NULL;
+	const char *user_addr = NULL;
+
+	priv = epage->priv;
+	if (COMP_EDITOR_PAGE (epage)->client)
+		source = e_cal_get_source (COMP_EDITOR_PAGE (epage)->client);
+	if (source)
+		user_addr = e_source_get_property (source, "subscriber");
+
+	if (user_addr)
+		subscribed_cal = TRUE;
+	else
+		user_addr = backend_address;
+
+	/*FIXME find the organizer using the address strings which is set in org combo box */
+	def_account = itip_addresses_get_default();
+	for (it = e_list_get_iterator((EList *)priv->accounts);
+	     e_iterator_is_valid(it);
+	     e_iterator_next(it)) {
+		gchar *full = NULL;
+		
+		a = (EAccount *)e_iterator_get(it);
+		full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);
+
+		/* Note that the address specified by the backend gets
+		 * precedence over the default mail address.
+		 */
+		if (user_addr && !g_ascii_strcasecmp (user_addr, a->id->address)) {
+			if (priv->default_address)
+				g_free (priv->default_address);
+
+			priv->default_address = full;
+		} else if (a == def_account && !priv->default_address) 
+			priv->default_address = full;
+		
+	}
+	g_object_unref(it);
+
+	if (priv->default_address) {
+		if (!priv->comp || !e_cal_component_has_organizer (priv->comp)) {
+			gtk_entry_set_text (GTK_ENTRY (GTK_COMBO (priv->organizer)->entry), priv->default_address);
+			/* FIXME: Use accessor functions to access private members of a GtkCombo widget */
+			gtk_widget_set_sensitive (GTK_WIDGET (GTK_COMBO (priv->organizer)->button), TRUE);
+		}
+		if (subscribed_cal) 
+			/* FIXME: Use accessor functions to access private members of a GtkCombo widget */
+			gtk_widget_set_sensitive (GTK_WIDGET (GTK_COMBO (priv->organizer)->button), FALSE);
+	} else
+		g_warning ("No potential organizers!");
+}
+
 /**
  * event_page_construct:
  * @epage: An event page.
@@ -3034,7 +3208,6 @@ EventPage *
 event_page_construct (EventPage *epage, EMeetingStore *model, ECal *client)
 {
 	EventPagePrivate *priv;
-	char *backend_address = NULL;
 	EIterator *it;
 	EAccount *def_account;
 	GList *address_strings = NULL, *l;
@@ -3064,38 +3237,19 @@ event_page_construct (EventPage *epage, EMeetingStore *model, ECal *client)
 		return NULL;
 	}
 
-	/* Address information */
-	if (!e_cal_get_cal_address (client, &backend_address, NULL))
-		return NULL;
-
 	priv->accounts = itip_addresses_get ();
 	def_account = itip_addresses_get_default();
 	for (it = e_list_get_iterator((EList *)priv->accounts);
 	     e_iterator_is_valid(it);
 	     e_iterator_next(it)) {
-		char *full;
+		gchar *full = NULL;
 		
 		a = (EAccount *)e_iterator_get(it);
 		full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);
 
 		address_strings = g_list_append(address_strings, full);
-
-		/* Note that the address specified by the backend gets
-		 * precedence over the default mail address.
-		 */
-		if (backend_address && !strcmp (backend_address, a->id->address)) {
-			if (priv->default_address)
-				g_free (priv->default_address);
-			
-			priv->default_address = g_strdup (full);
-		} else if (a == def_account && !priv->default_address) {
-			priv->default_address = g_strdup (full);
-		}
 	}
 	
-	if (backend_address)
-		g_free (backend_address);
-
 	g_object_unref(it);
 
 	if (address_strings)
diff --git a/calendar/gui/dialogs/event-page.glade b/calendar/gui/dialogs/event-page.glade
index 75cf8a94a1..86a7cbf0b6 100644
--- a/calendar/gui/dialogs/event-page.glade
+++ b/calendar/gui/dialogs/event-page.glade
@@ -4,7 +4,7 @@
 <glade-interface>
 
 <widget class="GtkWindow" id="event-toplevel">
-  <property name="title" translatable="no">window1</property>
+  <property name="title">window1</property>
   <property name="type">GTK_WINDOW_TOPLEVEL</property>
   <property name="window_position">GTK_WIN_POS_NONE</property>
   <property name="modal">False</property>
@@ -43,6 +43,58 @@
       </child>
 
       <child>
+	<widget class="GtkHBox" id="generic-info">
+	  <property name="homogeneous">False</property>
+	  <property name="spacing">0</property>
+
+	  <child>
+	    <widget class="GtkImage" id="generic-info-image">
+	      <property name="visible">True</property>
+	      <property name="xalign">0.5</property>
+	      <property name="yalign">0.5</property>
+	      <property name="xpad">0</property>
+	      <property name="ypad">0</property>
+	    </widget>
+	    <packing>
+	      <property name="padding">6</property>
+	      <property name="expand">False</property>
+	      <property name="fill">False</property>
+	    </packing>
+	  </child>
+
+	  <child>
+	    <widget class="GtkLabel" id="generic-info-msgs">
+	      <property name="visible">True</property>
+	      <property name="label" translatable="yes"></property>
+	      <property name="use_underline">False</property>
+	      <property name="use_markup">False</property>
+	      <property name="justify">GTK_JUSTIFY_LEFT</property>
+	      <property name="wrap">False</property>
+	      <property name="selectable">False</property>
+	      <property name="xalign">0.5</property>
+	      <property name="yalign">0.5</property>
+	      <property name="xpad">0</property>
+	      <property name="ypad">0</property>
+	      <property name="ellipsize">PANGO_ELLIPSIZE_NONE</property>
+	      <property name="width_chars">-1</property>
+	      <property name="single_line_mode">False</property>
+	      <property name="angle">0</property>
+	    </widget>
+	    <packing>
+	      <property name="padding">0</property>
+	      <property name="expand">False</property>
+	      <property name="fill">False</property>
+	    </packing>
+	  </child>
+	</widget>
+	<packing>
+	  <property name="padding">3</property>
+	  <property name="expand">False</property>
+	  <property name="fill">False</property>
+	</packing>
+      </child>
+
+      <child>
 	<widget class="GtkHBox" id="hbox56">
 	  <property name="visible">True</property>
 	  <property name="homogeneous">False</property>
@@ -105,7 +157,7 @@
 	      </child>
 
 	      <child>
-		<widget class="GtkLabel" id="label68">
+		<widget class="GtkLabel" id="description-label">
 		  <property name="visible">True</property>
 		  <property name="label" translatable="yes">D_escription:</property>
 		  <property name="use_underline">True</property>
diff --git a/calendar/gui/dialogs/event-page.h b/calendar/gui/dialogs/event-page.h
index 57610da201..b939e741af 100644
--- a/calendar/gui/dialogs/event-page.h
+++ b/calendar/gui/dialogs/event-page.h
@@ -72,6 +72,7 @@ void event_page_set_all_day_event (EventPage *epage, gboolean all_day);
 void event_page_set_show_categories (EventPage *epage, gboolean state);
 void event_page_set_show_time_busy (EventPage *epage, gboolean state);
 void event_page_show_alarm (EventPage *epage);
+void event_page_set_info_string (EventPage *epage, const gchar *icon, const gchar *msg);
 
 void event_page_set_view_role (EventPage *epage, gboolean state);
 void event_page_set_view_status (EventPage *epage, gboolean state);
diff --git a/calendar/gui/dialogs/memo-page.c b/calendar/gui/dialogs/memo-page.c
index 816144042c..6c50cc029f 100644
--- a/calendar/gui/dialogs/memo-page.c
+++ b/calendar/gui/dialogs/memo-page.c
@@ -70,6 +70,11 @@ struct _MemoPagePrivate {
 
 	ECalComponentClassification classification;
 
+	/* Generic informative messages placeholder */
+	GtkWidget *info_hbox;
+	GtkWidget *info_icon;
+	GtkWidget *info_string;
+
 	/* Organizer */
 	GtkWidget *org_label;
 	GtkWidget *org_combo;
@@ -114,6 +119,7 @@ static GtkWidget *memo_page_get_widget (CompEditorPage *page);
 static void memo_page_focus_main_widget (CompEditorPage *page);
 static gboolean memo_page_fill_widgets (CompEditorPage *page, ECalComponent *comp);
 static gboolean memo_page_fill_component (CompEditorPage *page, ECalComponent *comp);
+static void memo_page_select_organizer (MemoPage *mpage, const char *backend_address);
 
 G_DEFINE_TYPE (MemoPage, memo_page, TYPE_COMP_EDITOR_PAGE)
 
@@ -163,6 +169,10 @@ memo_page_init (MemoPage *mpage)
 	priv->categories_btn = NULL;
 	priv->categories = NULL;
 
+	priv->info_hbox = NULL;
+	priv->info_icon = NULL;
+	priv->info_string = NULL;
+
 	priv->updating = FALSE;
 }
 
@@ -300,8 +310,10 @@ sensitize_widgets (MemoPage *mpage)
 	
 	priv = mpage->priv;
 
-	if (!e_cal_is_read_only (COMP_EDITOR_PAGE (mpage)->client, &read_only, NULL))
-		read_only = TRUE;
+	/* The list of organizers is set to be non-editable. Otherwise any 
+ 	* change in the displayed list causes an 'Account not found' error. 
+ 	*/
+	gtk_editable_set_editable (GTK_EDITABLE (GTK_COMBO (priv->org_combo)->entry), FALSE);
 	
 	gtk_text_view_set_editable (GTK_TEXT_VIEW (priv->memo_content), sensitize);
 	gtk_widget_set_sensitive (priv->start_date, sensitize);
@@ -310,8 +322,6 @@ sensitize_widgets (MemoPage *mpage)
 	gtk_editable_set_editable (GTK_EDITABLE (priv->summary_entry), sensitize);
 	
 	if (COMP_EDITOR_PAGE (mpage)->flags & COMP_EDITOR_IS_SHARED) {
-		gtk_editable_set_editable (GTK_EDITABLE (GTK_COMBO (priv->org_combo)->entry), sensitize);
-	
 		if (priv->to_entry) {
 			gtk_editable_set_editable (GTK_EDITABLE (priv->to_entry), !read_only);
 			gtk_widget_grab_focus (priv->to_entry);
@@ -420,7 +430,7 @@ memo_page_fill_widgets (CompEditorPage *page, ECalComponent *comp)
 			else
 				string = g_strdup (strip);
 
-			if (itip_organizer_is_user (comp, page->client)) {
+			if (itip_organizer_is_user (comp, page->client) || itip_sentby_is_user (comp)) {
 			} else {
 				list = g_list_append (list, string);
 				gtk_combo_set_popdown_strings (GTK_COMBO (priv->org_combo), list);
@@ -575,7 +585,7 @@ get_current_account (MemoPage *page)
 		EAccount *a = (EAccount *)e_iterator_get(it);
 		char *full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);
 
-		if (!strcmp (full, str)) {
+		if (!g_ascii_strcasecmp (full, str)) {
 			g_free (full);
 			g_object_unref (it);
 
@@ -707,7 +717,12 @@ memo_page_fill_component (CompEditorPage *page, ECalComponent *comp)
 		ECalComponentOrganizer organizer = {NULL, NULL, NULL, NULL};
 
 		EAccount *a;
-		gchar *addr = NULL;
+		gchar *backend_addr = NULL, *org_addr = NULL, *sentby = NULL;
+ 
+		e_cal_get_cal_address (page->client, &backend_addr, NULL);
+
+		/* Organizer strings */
+		memo_page_select_organizer (mpage, backend_addr);
 
 		/* Find the identity for the organizer or sentby field */
 		a = get_current_account (mpage);
@@ -725,16 +740,25 @@ memo_page_fill_component (CompEditorPage *page, ECalComponent *comp)
 			return FALSE;
 		} 
 
-		addr = g_strdup_printf ("MAILTO:%s", a->id->address);
+		if (!backend_addr || !g_ascii_strcasecmp (backend_addr, a->id->address)) {
+			org_addr = g_strdup_printf ("MAILTO:%s", a->id->address);
+			organizer.value = org_addr;
+			organizer.cn = a->id->name;
+		} else {
+			org_addr = g_strdup_printf ("MAILTO:%s", backend_addr);
+			sentby = g_strdup_printf ("MAILTO:%s", a->id->address);
+			organizer.value = org_addr;
+			organizer.sentby = sentby;
+		};
 
-		organizer.value = addr;
-		organizer.cn = a->id->name;
 		e_cal_component_set_organizer (comp, &organizer);
 
 		if (page->flags & COMP_EDITOR_PAGE_NEW_ITEM)
 			comp_editor_page_notify_needs_send (page);
 
-		g_free (addr);
+		g_free (backend_addr);
+		g_free (org_addr);
+		g_free (sentby);
 	}
 
 	return TRUE;
@@ -752,6 +776,23 @@ memo_page_set_show_categories (MemoPage *page, gboolean state)
 	}
 }
 
+/*If the msg has some value set, the icon should always be set */
+void 
+memo_page_set_info_string (MemoPage *mpage, const gchar *icon, const gchar *msg)
+{
+	MemoPagePrivate *priv;
+
+	priv = mpage->priv;
+
+	gtk_image_set_from_stock (GTK_IMAGE (priv->info_icon), icon, GTK_ICON_SIZE_BUTTON);
+	gtk_label_set_text (GTK_LABEL(priv->info_string), msg);
+
+	if (msg && icon)
+		gtk_widget_show (priv->info_hbox); 
+	else
+		gtk_widget_hide (priv->info_hbox); 
+}
+
 /* Gets the widgets from the XML file and returns if they are all available. */
 static gboolean
 get_widgets (MemoPage *mpage)
@@ -781,6 +822,10 @@ get_widgets (MemoPage *mpage)
 	g_object_ref (priv->main);
 	gtk_container_remove (GTK_CONTAINER (priv->main->parent), priv->main);
 
+	priv->info_hbox = GW ("generic-info");
+	priv->info_icon = GW ("generic-info-image");
+	priv->info_string = GW ("generic-info-msgs");
+
 	priv->org_label = GW ("org-label");
 	priv->org_combo = GW ("org-combo");
 	
@@ -871,6 +916,17 @@ source_changed_cb (GtkWidget *widget, ESource *source, gpointer data)
 			comp_editor_notify_client_changed (
 				COMP_EDITOR (gtk_widget_get_toplevel (priv->main)),
 				client);
+
+			if (client) {
+				gchar *backend_addr = NULL;
+
+				e_cal_get_cal_address(client, &backend_addr, NULL);
+				if (backend_addr) {
+					memo_page_select_organizer (mpage, backend_addr);
+					g_free (backend_addr);
+				}
+			}
+
 			sensitize_widgets (mpage);
 		}
 	}
@@ -946,6 +1002,9 @@ init_widgets (MemoPage *mpage)
 
 	priv = mpage->priv;
 
+	/* Generic informative messages */
+	gtk_widget_hide (priv->info_hbox);
+
 	/* Summary */
 	g_signal_connect((priv->summary_entry), "changed",
 			    G_CALLBACK (summary_changed_cb), mpage);
@@ -1020,6 +1079,69 @@ get_to_entry (ENameSelector *name_selector)
 	return GTK_WIDGET (name_selector_entry);
 }
 
+static void
+memo_page_select_organizer (MemoPage *mpage, const char *backend_address)
+{
+	MemoPagePrivate *priv;
+	EIterator *it;
+	EAccount *def_account;
+	EAccount *a;
+	gboolean subscribed_cal = FALSE;
+	ESource *source = NULL;
+	const char *user_addr = NULL;
+
+	memo_page_set_info_string (mpage, NULL, NULL);
+
+	priv = mpage->priv;
+	if (COMP_EDITOR_PAGE (mpage)->client)
+		source = e_cal_get_source (COMP_EDITOR_PAGE (mpage)->client);
+	if (source)
+		user_addr = e_source_get_property (source, "subscriber");
+
+	if (user_addr) 
+		subscribed_cal = TRUE;
+	else 
+		user_addr = backend_address;
+
+	def_account = itip_addresses_get_default();
+	for (it = e_list_get_iterator((EList *)priv->accounts);
+	     e_iterator_is_valid(it);
+	     e_iterator_next(it)) {
+		gchar *full = NULL;
+		
+		a = (EAccount *)e_iterator_get(it);
+		full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);
+
+		/* Note that the address specified by the backend gets
+		 * precedence over the default mail address.
+		 */
+		if (user_addr && !g_ascii_strcasecmp (user_addr, a->id->address)) {
+			if (priv->default_address)
+				g_free (priv->default_address);
+
+			priv->default_address = full;
+		} else if (a == def_account && !priv->default_address)
+			priv->default_address = full;
+	}
+	g_object_unref(it);
+
+	if (priv->default_address) {
+		if (COMP_EDITOR_PAGE (mpage)->flags & COMP_EDITOR_PAGE_NEW_ITEM) {
+			gtk_entry_set_text (GTK_ENTRY (GTK_COMBO (priv->org_combo)->entry), priv->default_address);
+			/* FIXME: Use accessor functions to access private members of a GtkCombo widget */
+			gtk_widget_set_sensitive (GTK_WIDGET (GTK_COMBO (priv->org_combo)->button), TRUE);
+		}
+		if (subscribed_cal) {
+			/* Translators: This string is used when we are creating a Memo
+			   on behalf of some other user */
+			memo_page_set_info_string (mpage, GTK_STOCK_DIALOG_INFO, 
+				g_strdup_printf(_("You are acting on behalf of %s"), backend_address));
+			/* FIXME: Use accessor functions to access private members of a GtkCombo widget */
+			gtk_widget_set_sensitive (GTK_WIDGET (GTK_COMBO (priv->org_combo)->button), FALSE);
+		}
+	} else
+		g_warning ("No potential organizers!");
+}
 
 /**
  * memo_page_construct:
@@ -1041,6 +1163,7 @@ memo_page_construct (MemoPage *mpage)
 	EAccount *def_account;
 	EAccount *a;
 	CompEditorPageFlags flags = COMP_EDITOR_PAGE (mpage)->flags;
+	ECal *client = COMP_EDITOR_PAGE (mpage)->client;
 
 	priv = mpage->priv;
 
@@ -1062,32 +1185,26 @@ memo_page_construct (MemoPage *mpage)
 		return NULL;
 	}
 
+	/* Address information */
+	if (client && !e_cal_get_cal_address (client, &backend_address, NULL))
+		return NULL;
+
 	if (flags & COMP_EDITOR_PAGE_IS_SHARED) {
 		priv->accounts = itip_addresses_get ();
 		def_account = itip_addresses_get_default();
 		for (it = e_list_get_iterator((EList *)priv->accounts);
 				e_iterator_is_valid(it);
 				e_iterator_next(it)) {
-			char *full;
+			gchar *full = NULL;
 
 			a = (EAccount *)e_iterator_get(it);
 			full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);
 
 			address_strings = g_list_append(address_strings, full);
-
-			/* Note that the address specified by the backend gets
-			 * precedence over the default mail address.
-			 */
-			if (backend_address && !strcmp (backend_address, a->id->address)) {
-				if (priv->default_address)
-					g_free (priv->default_address);
-
-				priv->default_address = g_strdup (full);
-			} else if (a == def_account && !priv->default_address) {
-				priv->default_address = g_strdup (full);
-			}
 		}
 
+		memo_page_select_organizer (mpage, backend_address);
+
 		if (backend_address)
 			g_free (backend_address);
 
diff --git a/calendar/gui/dialogs/memo-page.glade b/calendar/gui/dialogs/memo-page.glade
index c8366f2a7c..4a76ecf82c 100644
--- a/calendar/gui/dialogs/memo-page.glade
+++ b/calendar/gui/dialogs/memo-page.glade
@@ -4,7 +4,7 @@
 <glade-interface>
 
 <widget class="GtkWindow" id="memo-toplevel">
-  <property name="title" translatable="no">window1</property>
+  <property name="title">window1</property>
   <property name="type">GTK_WINDOW_TOPLEVEL</property>
   <property name="window_position">GTK_WIN_POS_NONE</property>
   <property name="modal">False</property>
@@ -16,6 +16,7 @@
   <property name="type_hint">GDK_WINDOW_TYPE_HINT_NORMAL</property>
   <property name="gravity">GDK_GRAVITY_NORTH_WEST</property>
   <property name="focus_on_map">True</property>
+  <property name="urgency_hint">False</property>
 
   <child>
     <widget class="GtkVBox" id="memo-page">
@@ -24,6 +25,58 @@
       <property name="spacing">0</property>
 
       <child>
+	<widget class="GtkHBox" id="generic-info">
+	  <property name="homogeneous">False</property>
+	  <property name="spacing">0</property>
+
+	  <child>
+	    <widget class="GtkImage" id="generic-info-image">
+	      <property name="visible">True</property>
+	      <property name="xalign">0.5</property>
+	      <property name="yalign">0.5</property>
+	      <property name="xpad">0</property>
+	      <property name="ypad">0</property>
+	    </widget>
+	    <packing>
+	      <property name="padding">6</property>
+	      <property name="expand">False</property>
+	      <property name="fill">False</property>
+	    </packing>
+	  </child>
+
+	  <child>
+	    <widget class="GtkLabel" id="generic-info-msgs">
+	      <property name="visible">True</property>
+	      <property name="label" translatable="yes"></property>
+	      <property name="use_underline">False</property>
+	      <property name="use_markup">False</property>
+	      <property name="justify">GTK_JUSTIFY_LEFT</property>
+	      <property name="wrap">False</property>
+	      <property name="selectable">False</property>
+	      <property name="xalign">0.5</property>
+	      <property name="yalign">0.5</property>
+	      <property name="xpad">0</property>
+	      <property name="ypad">0</property>
+	      <property name="ellipsize">PANGO_ELLIPSIZE_NONE</property>
+	      <property name="width_chars">-1</property>
+	      <property name="single_line_mode">False</property>
+	      <property name="angle">0</property>
+	    </widget>
+	    <packing>
+	      <property name="padding">0</property>
+	      <property name="expand">False</property>
+	      <property name="fill">False</property>
+	    </packing>
+	  </child>
+	</widget>
+	<packing>
+	  <property name="padding">3</property>
+	  <property name="expand">False</property>
+	  <property name="fill">False</property>
+	</packing>
+      </child>
+
+      <child>
 	<widget class="GtkHBox" id="hbox7">
 	  <property name="border_width">3</property>
 	  <property name="visible">True</property>
diff --git a/calendar/gui/dialogs/memo-page.h b/calendar/gui/dialogs/memo-page.h
index dabbf3edbc..a6fe66b549 100644
--- a/calendar/gui/dialogs/memo-page.h
+++ b/calendar/gui/dialogs/memo-page.h
@@ -55,7 +55,7 @@ MemoPage *memo_page_construct (MemoPage *epage);
 MemoPage *memo_page_new       (BonoboUIComponent *uic, CompEditorPageFlags flags);
 void      memo_page_set_classification (MemoPage *page, ECalComponentClassification class);
 void      memo_page_set_show_categories (MemoPage *page, gboolean state);
-
+void 	  memo_page_set_info_string (MemoPage *mpage, const gchar *icon, const gchar *msg);
 G_END_DECLS
 
 #endif
diff --git a/calendar/gui/dialogs/task-page.c b/calendar/gui/dialogs/task-page.c
index dd6277cca5..55b02f5fe9 100644
--- a/calendar/gui/dialogs/task-page.c
+++ b/calendar/gui/dialogs/task-page.c
@@ -81,6 +81,11 @@ struct _TaskPagePrivate {
 	/* Lists of attendees */
 	GPtrArray *deleted_attendees;
 	
+	/* Generic informative messages placeholder */
+	GtkWidget *info_hbox;
+	GtkWidget *info_icon;
+	GtkWidget *info_string;
+
 	GtkWidget *summary;
 	GtkWidget *summary_label;
 
@@ -143,6 +148,7 @@ static gboolean task_page_fill_component (CompEditorPage *page, ECalComponent *c
 static gboolean task_page_fill_timezones (CompEditorPage *page, GHashTable *timezones);
 static void task_page_set_summary (CompEditorPage *page, const char *summary);
 static void task_page_set_dates (CompEditorPage *page, CompEditorPageDates *dates);
+static void task_page_select_organizer (TaskPage *tpage, const char *backend_address);
 
 G_DEFINE_TYPE (TaskPage, task_page, TYPE_COMP_EDITOR_PAGE)
 
@@ -192,6 +198,10 @@ task_page_init (TaskPage *tpage)
 	priv->sendoptions_shown = FALSE;
 	priv->sod = NULL;
 
+	priv->info_hbox = NULL;
+	priv->info_icon = NULL;
+	priv->info_string = NULL;
+
 	priv->updating = FALSE;
 	priv->sendoptions_shown = FALSE;
 	priv->is_assignment = FALSE;
@@ -391,6 +401,11 @@ sensitize_widgets (TaskPage *tpage)
 
 	sensitize = (!read_only && sens);
 
+	/* The list of organizers is set to be non-editable. Otherwise any 
+	 * change in the displayed list causes an 'Account not found' error. 
+	 */
+	gtk_editable_set_editable (GTK_EDITABLE (GTK_COMBO (priv->organizer)->entry), FALSE);
+
 	gtk_editable_set_editable (GTK_EDITABLE (priv->summary), !read_only);
 	gtk_widget_set_sensitive (priv->due_date, !read_only);
 	gtk_widget_set_sensitive (priv->start_date, !read_only);
@@ -486,7 +501,7 @@ get_current_account (TaskPage *page)
 		EAccount *a = (EAccount *)e_iterator_get(it);
 		char *full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);
 
-		if (!strcmp (full, str)) {
+		if (!g_ascii_strcasecmp (full, str)) {
 			g_free (full);
 			g_object_unref (it);
 
@@ -662,16 +677,21 @@ task_page_fill_widgets (CompEditorPage *page, ECalComponent *comp)
 
 	if (priv->is_assignment) {
 		ECalComponentOrganizer organizer;	
+		gchar *backend_addr = NULL;
 		
 		priv->user_add = itip_get_comp_attendee (comp, COMP_EDITOR_PAGE (tpage)->client);	
 
+		/* Organizer strings */
+		e_cal_get_cal_address (COMP_EDITOR_PAGE (tpage)->client, &backend_addr, NULL);
+		task_page_select_organizer (tpage, backend_addr);
+
 		/* If there is an existing organizer show it properly */
 		if (e_cal_component_has_organizer (comp)) {
 			e_cal_component_get_organizer (comp, &organizer);
 			if (organizer.value != NULL) {
 				const gchar *strip = itip_strip_mailto (organizer.value);
 				gchar *string;
-				if (itip_organizer_is_user (comp, page->client)) {
+				if (itip_organizer_is_user (comp, page->client) || itip_sentby_is_user (comp)) {
 					if (e_cal_get_static_capability (
 								page->client,
 								CAL_STATIC_CAPABILITY_ORGANIZER_NOT_EMAIL_ADDRESS))
@@ -704,21 +724,30 @@ task_page_fill_widgets (CompEditorPage *page, ECalComponent *comp)
 			if (a != NULL) {
 				/* Reuse *page declared further up? */
 				CompEditorPage *page = (CompEditorPage *) tpage;
+
 				priv->ia = e_meeting_store_add_attendee_with_defaults (priv->model);
 				g_object_ref (priv->ia);
 
-				e_meeting_attendee_set_address (priv->ia, g_strdup_printf ("MAILTO:%s", a->id->address));
-				e_meeting_attendee_set_cn (priv->ia, g_strdup (a->id->name));
+				if (!(backend_addr && *backend_addr) || !g_ascii_strcasecmp (backend_addr, a->id->address)) {
+					e_meeting_attendee_set_address (priv->ia, g_strdup_printf ("MAILTO:%s", a->id->address));
+					e_meeting_attendee_set_cn (priv->ia, g_strdup (a->id->name));
+				} else { 
+					e_meeting_attendee_set_address (priv->ia, g_strdup_printf ("MAILTO:%s", backend_addr));
+					e_meeting_attendee_set_sentby (priv->ia, g_strdup_printf ("MAILTO:%s", a->id->address));
+				}
+
 				if (page->client && e_cal_get_organizer_must_accept (page->client))
 					e_meeting_attendee_set_status (priv->ia, ICAL_PARTSTAT_NEEDSACTION);
 				else
 					e_meeting_attendee_set_status (priv->ia, ICAL_PARTSTAT_ACCEPTED);
 				e_meeting_list_view_add_attendee_to_name_selector (E_MEETING_LIST_VIEW (priv->list_view), priv->ia);
 			}
+
 		}
+		if (backend_addr) 
+			g_free (backend_addr);
 	}
 
-
 	priv->updating = FALSE;
 
 	sensitize_widgets (tpage);
@@ -895,7 +924,12 @@ task_page_fill_component (CompEditorPage *page, ECalComponent *comp)
 
 		if (!priv->existing) {
 			EAccount *a;
-			gchar *addr = NULL;
+			gchar *backend_addr = NULL, *org_addr = NULL, *sentby = NULL;
+
+			e_cal_get_cal_address (page->client, &backend_addr, NULL);
+
+			/* FIXME need not set organizer strings here */
+			task_page_select_organizer (tpage, backend_addr);
 
 			/* Find the identity for the organizer or sentby field */
 			a = get_current_account (tpage);
@@ -913,13 +947,22 @@ task_page_fill_component (CompEditorPage *page, ECalComponent *comp)
 				return FALSE;
 			} 
 
-			addr = g_strdup_printf ("MAILTO:%s", a->id->address);
+			if (!backend_addr || !g_ascii_strcasecmp (backend_addr, a->id->address)) {
+				org_addr = g_strdup_printf ("MAILTO:%s", a->id->address);
+				organizer.value = org_addr;
+				organizer.cn = a->id->name;
+			} else {
+				org_addr = g_strdup_printf ("MAILTO:%s", backend_addr);
+				sentby = g_strdup_printf ("MAILTO:%s", a->id->address);
+				organizer.value = org_addr;
+				organizer.sentby = sentby;
+			}
 
-			organizer.value = addr;
-			organizer.cn = a->id->name;
 			e_cal_component_set_organizer (comp, &organizer);
 
-			g_free (addr);
+			g_free (backend_addr);
+			g_free (org_addr);
+			g_free (sentby);
 		}
 
 		if (e_meeting_store_count_actual_attendees (priv->model) < 1) {
@@ -1001,19 +1044,27 @@ existing_attendee (EMeetingAttendee *ia, ECalComponent *comp)
 {
 	GSList *attendees, *l;
 	const gchar *ia_address;
+	const gchar *ia_sentby = NULL;
 	
 	ia_address = itip_strip_mailto (e_meeting_attendee_get_address (ia));
 	if (!ia_address)
 		return FALSE;
 	
+	if (e_meeting_attendee_is_set_sentby (ia))
+		ia_sentby = itip_strip_mailto (e_meeting_attendee_get_sentby (ia));
+
 	e_cal_component_get_attendee_list (comp, &attendees);
 
 	for (l = attendees; l; l = l->next) {
 		ECalComponentAttendee *attendee = l->data;
 		const char *address;
+		const char *sentby = NULL;
 		
 		address = itip_strip_mailto (attendee->value);
-		if (address && !g_ascii_strcasecmp (ia_address, address)) {
+		if (attendee->sentby)
+			sentby = itip_strip_mailto (attendee->sentby);
+
+		if ((address && !g_ascii_strcasecmp (ia_address, address)) || (sentby && !g_ascii_strcasecmp (ia_sentby, sentby))) {
 			e_cal_component_free_attendee_list (attendees);
 			return TRUE;
 		}
@@ -1351,6 +1402,24 @@ task_page_fill_timezones (CompEditorPage *page, GHashTable *timezones)
 	return TRUE;
 }
 
+/*If the msg has some value set, the icon should always be set */
+void 
+task_page_set_info_string (TaskPage *tpage, const gchar *icon, const gchar *msg)
+{
+	TaskPagePrivate *priv;
+
+	priv = tpage->priv;
+
+	gtk_image_set_from_stock (GTK_IMAGE (priv->info_icon), icon, GTK_ICON_SIZE_BUTTON);
+	gtk_label_set_text (GTK_LABEL(priv->info_string), msg);
+	
+	
+	if (msg && icon)
+		gtk_widget_show (priv->info_hbox); 
+	else
+		gtk_widget_hide (priv->info_hbox); 
+}
+
 /* set_summary handler for the task page */
 static void
 task_page_set_summary (CompEditorPage *page, const char *summary)
@@ -1402,6 +1471,10 @@ get_widgets (TaskPage *tpage)
 	g_object_ref (priv->main);
 	gtk_container_remove (GTK_CONTAINER (priv->main->parent), priv->main);
 
+	priv->info_hbox = GW ("generic-info");
+	priv->info_icon = GW ("generic-info-image");
+	priv->info_string = GW ("generic-info-msgs");
+
 	priv->summary = GW ("summary");
 	priv->summary_label = GW ("summary-label");
 
@@ -1657,6 +1730,16 @@ source_changed_cb (GtkWidget *widget, ESource *source, gpointer data)
 			else
 				task_page_hide_options (tpage);
 
+			if (client) {
+				gchar *backend_addr = NULL;
+
+				e_cal_get_cal_address(client, &backend_addr, NULL);
+				
+				if (backend_addr && *backend_addr) 
+					task_page_select_organizer (tpage, backend_addr);
+
+				g_free (backend_addr);
+			}
 
 			sensitize_widgets (tpage);
 		}
@@ -1707,6 +1790,9 @@ init_widgets (TaskPage *tpage)
 					   (EDateEditGetTimeCallback) comp_editor_get_current_time,
 					   tpage, NULL);
 	
+	/* Generic informative messages */
+	gtk_widget_hide (priv->info_hbox);
+
 	/* Summary */
 	g_signal_connect((priv->summary), "changed",
 			    G_CALLBACK (summary_changed_cb), tpage);
@@ -1801,6 +1887,72 @@ init_widgets (TaskPage *tpage)
 
 
 
+static void
+task_page_select_organizer (TaskPage *tpage, const char *backend_address)
+{
+	TaskPagePrivate *priv;
+	EIterator *it;
+	EAccount *def_account;
+	EAccount *a;
+	gboolean subscribed_cal = FALSE;
+	ESource *source = NULL;
+	const char *user_addr = NULL;
+
+	task_page_set_info_string (tpage, NULL, NULL);
+
+	priv = tpage->priv;
+	if (COMP_EDITOR_PAGE (tpage)->client)
+		source = e_cal_get_source (COMP_EDITOR_PAGE (tpage)->client);
+	if (source)
+		user_addr = e_source_get_property (source, "subscriber");
+
+	if (user_addr)
+		subscribed_cal = TRUE;
+	else 
+		user_addr = backend_address;
+
+	def_account = itip_addresses_get_default();
+	for (it = e_list_get_iterator((EList *)priv->accounts);
+	     e_iterator_is_valid(it);
+	     e_iterator_next(it)) {
+		gchar *full = NULL;
+		
+		a = (EAccount *)e_iterator_get(it);
+		full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);
+
+		/* Note that the address specified by the backend gets
+		 * precedence over the default mail address.
+		 */
+		if (user_addr && !g_ascii_strcasecmp (user_addr, a->id->address)) {
+			if (priv->default_address)
+				g_free (priv->default_address);
+
+			priv->default_address = full;
+		} else if (a == def_account && !priv->default_address)
+			priv->default_address = full;
+	}
+	g_object_unref(it);
+
+	if (priv->default_address) {
+		if (!priv->comp || !e_cal_component_has_organizer (priv->comp)) {
+			gtk_entry_set_text (GTK_ENTRY (GTK_COMBO (priv->organizer)->entry), priv->default_address);
+			/* FIXME: Use accessor functions to access private members of a GtkCombo widget */
+			gtk_widget_set_sensitive (GTK_WIDGET (GTK_COMBO (priv->organizer)->button), TRUE);
+		}
+
+		/*FIXME do not set the info string here */
+		if (subscribed_cal) {
+			/* Translators: This string is used when we are creating a Task 
+			   on behalf of some other user */
+			task_page_set_info_string (tpage, GTK_STOCK_DIALOG_INFO, 
+				g_strdup_printf(_("You are acting on behalf of %s"), backend_address));
+			/* FIXME: Use accessor functions to access private members of a GtkCombo widget */
+			gtk_widget_set_sensitive (GTK_WIDGET (GTK_COMBO (priv->organizer)->button), FALSE);
+		}
+	} else
+		g_warning ("No potential organizers!");
+}
+
 /**
  * task_page_construct:
  * @tpage: An task page.
@@ -1852,26 +2004,16 @@ task_page_construct (TaskPage *tpage, EMeetingStore *model, ECal *client)
 	for (it = e_list_get_iterator((EList *)priv->accounts);
 	     e_iterator_is_valid(it);
 	     e_iterator_next(it)) {
-		char *full;
+		gchar *full = NULL;
 		
 		a = (EAccount *)e_iterator_get(it);
 		full = g_strdup_printf("%s <%s>", a->id->name, a->id->address);
 
 		address_strings = g_list_append(address_strings, full);
-
-		/* Note that the address specified by the backend gets
-		 * precedence over the default mail address.
-		 */
-		if (backend_address && !strcmp (backend_address, a->id->address)) {
-			if (priv->default_address)
-				g_free (priv->default_address);
-			
-			priv->default_address = g_strdup (full);
-		} else if (a == def_account && !priv->default_address) {
-			priv->default_address = g_strdup (full);
-		}
 	}
 	
+	task_page_select_organizer (tpage, backend_address);
+
 	if (backend_address)
 		g_free (backend_address);
 
diff --git a/calendar/gui/dialogs/task-page.glade b/calendar/gui/dialogs/task-page.glade
index 7b98c97497..a4a105606c 100644
--- a/calendar/gui/dialogs/task-page.glade
+++ b/calendar/gui/dialogs/task-page.glade
@@ -4,7 +4,7 @@
 <glade-interface>
 
 <widget class="GtkWindow" id="task-toplevel">
-  <property name="title" translatable="no">window1</property>
+  <property name="title">window1</property>
   <property name="type">GTK_WINDOW_TOPLEVEL</property>
   <property name="window_position">GTK_WIN_POS_NONE</property>
   <property name="modal">False</property>
@@ -16,6 +16,7 @@
   <property name="type_hint">GDK_WINDOW_TYPE_HINT_NORMAL</property>
   <property name="gravity">GDK_GRAVITY_NORTH_WEST</property>
   <property name="focus_on_map">True</property>
+  <property name="urgency_hint">False</property>
 
   <child>
     <widget class="GtkVBox" id="task-page">
@@ -25,6 +26,58 @@
       <property name="spacing">6</property>
 
       <child>
+	<widget class="GtkHBox" id="generic-info">
+	  <property name="homogeneous">False</property>
+	  <property name="spacing">0</property>
+
+	  <child>
+	    <widget class="GtkImage" id="generic-info-image">
+	      <property name="visible">True</property>
+	      <property name="xalign">0.5</property>
+	      <property name="yalign">0.5</property>
+	      <property name="xpad">0</property>
+	      <property name="ypad">0</property>
+	    </widget>
+	    <packing>
+	      <property name="padding">6</property>
+	      <property name="expand">False</property>
+	      <property name="fill">False</property>
+	    </packing>
+	  </child>
+
+	  <child>
+	    <widget class="GtkLabel" id="generic-info-msgs">
+	      <property name="visible">True</property>
+	      <property name="label" translatable="yes"></property>
+	      <property name="use_underline">False</property>
+	      <property name="use_markup">False</property>
+	      <property name="justify">GTK_JUSTIFY_LEFT</property>
+	      <property name="wrap">False</property>
+	      <property name="selectable">False</property>
+	      <property name="xalign">0.5</property>
+	      <property name="yalign">0.5</property>
+	      <property name="xpad">0</property>
+	      <property name="ypad">0</property>
+	      <property name="ellipsize">PANGO_ELLIPSIZE_NONE</property>
+	      <property name="width_chars">-1</property>
+	      <property name="single_line_mode">False</property>
+	      <property name="angle">0</property>
+	    </widget>
+	    <packing>
+	      <property name="padding">0</property>
+	      <property name="expand">False</property>
+	      <property name="fill">False</property>
+	    </packing>
+	  </child>
+	</widget>
+	<packing>
+	  <property name="padding">3</property>
+	  <property name="expand">False</property>
+	  <property name="fill">False</property>
+	</packing>
+      </child>
+
+      <child>
 	<widget class="GtkHBox" id="hbox7">
 	  <property name="visible">True</property>
 	  <property name="homogeneous">False</property>
@@ -320,6 +373,8 @@
 
 		  <child>
 		    <widget class="GtkTextView" id="description">
+		      <property name="width_request">400</property>
+		      <property name="height_request">150</property>
 		      <property name="visible">True</property>
 		      <property name="can_focus">True</property>
 		      <property name="editable">True</property>
@@ -335,8 +390,6 @@
 		      <property name="right_margin">0</property>
 		      <property name="indent">0</property>
 		      <property name="text" translatable="yes"></property>
-		      <property name="width_request">400</property>
-		      <property name="height_request">150</property>
 		    </widget>
 		  </child>
 		</widget>
diff --git a/calendar/gui/dialogs/task-page.h b/calendar/gui/dialogs/task-page.h
index 64fa67591b..1431b4976b 100644
--- a/calendar/gui/dialogs/task-page.h
+++ b/calendar/gui/dialogs/task-page.h
@@ -70,7 +70,7 @@ void task_page_set_view_rsvp (TaskPage *page, gboolean state);
 void task_page_set_classification (TaskPage *page, ECalComponentClassification class);
 void task_page_set_show_timezone (TaskPage *page, gboolean state);
 void task_page_set_show_categories (TaskPage *page, gboolean state);
-
+void task_page_set_info_string (TaskPage *tpage, const gchar *icon, const gchar *msg);
 
 
 G_END_DECLS