diff --git a/components/calendar/calendar-widget.tsx b/components/calendar/calendar-widget.tsx
index 397bbcd..d8f9006 100644
--- a/components/calendar/calendar-widget.tsx
+++ b/components/calendar/calendar-widget.tsx
@@ -142,6 +142,22 @@ export function CalendarWidget() {
         }
         
         setEvents(upcomingEvents.slice(0, 5)); // Keep only 5 for display
+        
+        // Dispatch event for Outlook-style notifications (when events start)
+        window.dispatchEvent(new CustomEvent('calendar-events-updated', {
+          detail: {
+            events: upcomingEvents.map(evt => ({
+              id: evt.id,
+              title: evt.title,
+              start: evt.start,
+              end: evt.end,
+              isAllDay: evt.isAllDay,
+              calendarName: evt.calendarName,
+              calendarColor: evt.calendarColor,
+            })),
+          }
+        }));
+        
         setError(null);
       } catch (err) {
         console.error("Calendar Widget - Error in fetchUpcomingEvents:", err);
@@ -155,10 +171,12 @@ export function CalendarWidget() {
     fetchUpcomingEvents();
 
     // Set up an interval to refresh events every 5 minutes
-    const intervalId = setInterval(fetchUpcomingEvents, 300000);
+    const intervalId = setInterval(() => {
+      fetchUpcomingEvents();
+    }, 300000);
 
     return () => clearInterval(intervalId);
-  }, [session, status]);
+  }, [session, status, triggerNotification]);
 
   const formatEventDate = (date: Date, isAllDay: boolean) => {
     let dateString = "";
diff --git a/components/layout/layout-wrapper.tsx b/components/layout/layout-wrapper.tsx
index 4760af9..61b5712 100644
--- a/components/layout/layout-wrapper.tsx
+++ b/components/layout/layout-wrapper.tsx
@@ -12,6 +12,7 @@ import { useRocketChatCalls } from "@/hooks/use-rocketchat-calls";
 import { IncomingCallNotification } from "@/components/incoming-call-notification";
 import { useEmailNotifications } from "@/hooks/use-email-notifications";
 import { useRocketChatMessageNotifications } from "@/hooks/use-rocketchat-message-notifications";
+import { useCalendarEventNotifications } from "@/hooks/use-calendar-event-notifications";
 import { OutlookNotification } from "@/components/outlook-notification";
 import { NotificationStack } from "@/components/notification-stack";
 
@@ -257,6 +258,15 @@ export function LayoutWrapper({ children, isSignInPage, isAuthenticated }: Layou
               }}
             />
           )}
+          {eventNotification && (
+            <OutlookNotification
+              notification={eventNotification}
+              onDismiss={() => {
+                console.log('[LayoutWrapper] Calendar event notification dismissed');
+                setEventNotification(null);
+              }}
+            />
+          )}
         </NotificationStack>
       )}
     </AuthCheck>
diff --git a/hooks/use-calendar-event-notifications.ts b/hooks/use-calendar-event-notifications.ts
new file mode 100644
index 0000000..b39d25f
--- /dev/null
+++ b/hooks/use-calendar-event-notifications.ts
@@ -0,0 +1,153 @@
+import { useState, useEffect, useRef } from 'react';
+import { Calendar } from 'lucide-react';
+import { OutlookNotificationData } from '@/components/outlook-notification';
+import { format } from 'date-fns';
+import { fr } from 'date-fns/locale';
+
+interface CalendarEvent {
+  id: string;
+  title: string;
+  start: Date;
+  end: Date;
+  isAllDay: boolean;
+  calendarName?: string;
+  calendarColor?: string;
+}
+
+/**
+ * Hook to manage calendar event notifications and show Outlook-style notifications
+ * when an event's start time arrives
+ */
+export function useCalendarEventNotifications() {
+  const [eventNotification, setEventNotification] = useState<OutlookNotificationData | null>(null);
+  const notifiedEventIdsRef = useRef<Set<string>>(new Set());
+  const eventsRef = useRef<CalendarEvent[]>([]);
+  const checkIntervalRef = useRef<NodeJS.Timeout | null>(null);
+
+  useEffect(() => {
+    // Listen for calendar events updates
+    const handleEventsUpdate = (event: CustomEvent) => {
+      const events = event.detail?.events || [];
+      
+      if (!events || events.length === 0) {
+        eventsRef.current = [];
+        return;
+      }
+
+      // Convert events to CalendarEvent format
+      const calendarEvents: CalendarEvent[] = events.map((evt: any) => ({
+        id: evt.id,
+        title: evt.title,
+        start: new Date(evt.start),
+        end: new Date(evt.end),
+        isAllDay: evt.isAllDay || false,
+        calendarName: evt.calendarName,
+        calendarColor: evt.calendarColor,
+      }));
+
+      eventsRef.current = calendarEvents;
+      console.log('[useCalendarEventNotifications] Events updated', {
+        count: calendarEvents.length,
+      });
+    };
+
+    window.addEventListener('calendar-events-updated', handleEventsUpdate as EventListener);
+
+    // Check for events that are starting now (every minute)
+    const checkForStartingEvents = () => {
+      const now = new Date();
+      const currentTime = now.getTime();
+      
+      // Check events that start within the next 2 minutes (to catch events that just started)
+      const upcomingWindow = 2 * 60 * 1000; // 2 minutes in milliseconds
+      
+      const startingEvents = eventsRef.current.filter((event) => {
+        // Skip if already notified
+        if (notifiedEventIdsRef.current.has(event.id)) {
+          return false;
+        }
+
+        const eventStartTime = event.start.getTime();
+        const timeUntilStart = eventStartTime - currentTime;
+        
+        // Event is starting now or within the next 2 minutes
+        // And hasn't started more than 5 minutes ago (to avoid old notifications)
+        return (
+          timeUntilStart >= -5 * 60 * 1000 && // Not more than 5 minutes ago
+          timeUntilStart <= upcomingWindow // Within next 2 minutes
+        );
+      });
+
+      if (startingEvents.length > 0) {
+        // Sort by start time (earliest first)
+        startingEvents.sort((a, b) => a.start.getTime() - b.start.getTime());
+        
+        // Show notification for the first event starting
+        const event = startingEvents[0];
+        
+        console.log('[useCalendarEventNotifications] 📅 Event starting detected', {
+          title: event.title,
+          start: event.start,
+          now: now,
+        });
+
+        const timeStr = event.isAllDay
+          ? 'Toute la journée'
+          : format(event.start, 'HH:mm', { locale: fr });
+
+        const notification: OutlookNotificationData = {
+          id: `calendar-${event.id}-${Date.now()}`,
+          source: 'calendar',
+          title: 'Agenda',
+          subtitle: event.isAllDay ? 'Événement aujourd\'hui' : 'Événement maintenant',
+          message: `${event.title}${event.isAllDay ? '' : ` à ${timeStr}`}${event.calendarName ? ` (${event.calendarName})` : ''}`,
+          icon: Calendar,
+          iconColor: 'text-orange-600',
+          iconBgColor: 'bg-orange-100',
+          borderColor: 'border-orange-500',
+          link: '/agenda',
+          timestamp: event.start,
+          autoDismiss: 30000, // 30 seconds for calendar events
+          actions: [
+            {
+              label: 'Ouvrir',
+              onClick: () => {
+                window.location.href = '/agenda';
+              },
+              variant: 'default',
+              className: 'bg-orange-600 hover:bg-orange-700 text-white',
+            },
+          ],
+        };
+
+        setEventNotification(notification);
+        notifiedEventIdsRef.current.add(event.id);
+
+        // Clean up old notified events (older than 1 hour) to allow re-notification if needed
+        setTimeout(() => {
+          notifiedEventIdsRef.current.delete(event.id);
+        }, 60 * 60 * 1000); // 1 hour
+      }
+    };
+
+    // Check immediately and then every minute
+    checkForStartingEvents();
+    checkIntervalRef.current = setInterval(checkForStartingEvents, 60000); // Every minute
+
+    return () => {
+      window.removeEventListener('calendar-events-updated', handleEventsUpdate as EventListener);
+      if (checkIntervalRef.current) {
+        clearInterval(checkIntervalRef.current);
+      }
+    };
+  }, []);
+
+  const handleDismiss = () => {
+    setEventNotification(null);
+  };
+
+  return {
+    eventNotification,
+    setEventNotification: handleDismiss,
+  };
+}