diff --git a/hooks/use-calendar-event-notifications.ts b/hooks/use-calendar-event-notifications.ts
index 4a1e3b4..f64fb30 100644
--- a/hooks/use-calendar-event-notifications.ts
+++ b/hooks/use-calendar-event-notifications.ts
@@ -1,4 +1,4 @@
-import { useState, useEffect, useRef } from 'react';
+import { useState, useEffect, useRef, useCallback } from 'react';
 import { Calendar } from 'lucide-react';
 import { OutlookNotificationData } from '@/components/outlook-notification';
 import { format } from 'date-fns';
@@ -24,6 +24,35 @@ export function useCalendarEventNotifications() {
   const eventsRef = useRef<CalendarEvent[]>([]);
   const checkIntervalRef = useRef<NodeJS.Timeout | null>(null);
 
+  // Load notified event IDs from localStorage on mount
+  useEffect(() => {
+    try {
+      const stored = localStorage.getItem('notified-event-ids');
+      if (stored) {
+        const ids = JSON.parse(stored);
+        notifiedEventIdsRef.current = new Set(ids);
+        console.log('[useCalendarEventNotifications] 📦 Loaded notified event IDs from localStorage', {
+          count: ids.length,
+        });
+      }
+    } catch (error) {
+      console.error('[useCalendarEventNotifications] ❌ Error loading notified event IDs from localStorage', error);
+    }
+  }, []);
+
+  // Save notified event IDs to localStorage whenever it changes
+  const saveNotifiedEventIds = useCallback(() => {
+    try {
+      const ids = Array.from(notifiedEventIdsRef.current);
+      localStorage.setItem('notified-event-ids', JSON.stringify(ids));
+      console.log('[useCalendarEventNotifications] 💾 Saved notified event IDs to localStorage', {
+        count: ids.length,
+      });
+    } catch (error) {
+      console.error('[useCalendarEventNotifications] ❌ Error saving notified event IDs to localStorage', error);
+    }
+  }, []);
+
   useEffect(() => {
     console.log('[useCalendarEventNotifications] 🎧 Hook initialized, listening for calendar-events-updated');
     
@@ -170,10 +199,12 @@ export function useCalendarEventNotifications() {
 
         setEventNotification(notification);
         notifiedEventIdsRef.current.add(event.id);
+        saveNotifiedEventIds(); // Persist to localStorage
 
         // Clean up old notified events (older than 1 hour) to allow re-notification if needed
         setTimeout(() => {
           notifiedEventIdsRef.current.delete(event.id);
+          saveNotifiedEventIds(); // Update localStorage after cleanup
         }, 60 * 60 * 1000); // 1 hour
       }
     };
diff --git a/hooks/use-task-notifications.ts b/hooks/use-task-notifications.ts
index f573767..df46368 100644
--- a/hooks/use-task-notifications.ts
+++ b/hooks/use-task-notifications.ts
@@ -1,4 +1,4 @@
-import { useState, useEffect, useRef } from 'react';
+import { useState, useEffect, useRef, useCallback } from 'react';
 import { CheckSquare } from 'lucide-react';
 import { OutlookNotificationData } from '@/components/outlook-notification';
 import { format } from 'date-fns';
@@ -24,6 +24,35 @@ export function useTaskNotifications() {
   const tasksRef = useRef<Task[]>([]);
   const checkIntervalRef = useRef<NodeJS.Timeout | null>(null);
 
+  // Load notified task IDs from localStorage on mount
+  useEffect(() => {
+    try {
+      const stored = localStorage.getItem('notified-task-ids');
+      if (stored) {
+        const ids = JSON.parse(stored);
+        notifiedTaskIdsRef.current = new Set(ids);
+        console.log('[useTaskNotifications] 📦 Loaded notified task IDs from localStorage', {
+          count: ids.length,
+        });
+      }
+    } catch (error) {
+      console.error('[useTaskNotifications] ❌ Error loading notified task IDs from localStorage', error);
+    }
+  }, []);
+
+  // Save notified task IDs to localStorage whenever it changes
+  const saveNotifiedTaskIds = useCallback(() => {
+    try {
+      const ids = Array.from(notifiedTaskIdsRef.current);
+      localStorage.setItem('notified-task-ids', JSON.stringify(ids));
+      console.log('[useTaskNotifications] 💾 Saved notified task IDs to localStorage', {
+        count: ids.length,
+      });
+    } catch (error) {
+      console.error('[useTaskNotifications] ❌ Error saving notified task IDs to localStorage', error);
+    }
+  }, []);
+
   useEffect(() => {
     console.log('[useTaskNotifications] 🎧 Hook initialized, listening for tasks-updated');
     
@@ -295,10 +324,12 @@ export function useTaskNotifications() {
 
         setTaskNotification(notification);
         notifiedTaskIdsRef.current.add(task.id);
+        saveNotifiedTaskIds(); // Persist to localStorage
 
         // Clean up old notified tasks (older than 1 hour) to allow re-notification if needed
         setTimeout(() => {
           notifiedTaskIdsRef.current.delete(task.id);
+          saveNotifiedTaskIds(); // Update localStorage after cleanup
         }, 60 * 60 * 1000); // 1 hour
       }
     };