diff --git a/package.json b/package.json
index 54a8987..75f5cc1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "my-weekly-todo-list",
-  "version": "1.64.0",
+  "version": "1.65.0",
   "description": "A web-based weekly task management application that organizes to-dos and calendar events in a single, intuitive weekly view",
   "main": "index.js",
   "scripts": {
diff --git a/src/components/WeeklyView.tsx b/src/components/WeeklyView.tsx
index 0410e1b..35975f8 100644
--- a/src/components/WeeklyView.tsx
+++ b/src/components/WeeklyView.tsx
@@ -3592,6 +3592,79 @@ export default function WeeklyView() {
         [calendarEvents, effectiveCellDuration],
     );
 
+    // Precompute overlap layout: { [eventId]: { column, totalColumns } }
+    const eventOverlapLayout = useMemo(() => {
+        const layout: Record<string, { column: number; totalColumns: number }> = {};
+        // Group events by day
+        const dayMap = new Map<string, CalendarEvent[]>();
+        for (const event of calendarEvents) {
+            if (isAllDayEvent(event)) continue;
+            const d = new Date(event.startTime);
+            const key = `${d.getFullYear()}-${d.getMonth()}-${d.getDate()}`;
+            if (!dayMap.has(key)) dayMap.set(key, []);
+            dayMap.get(key)!.push(event);
+        }
+        for (const events of dayMap.values()) {
+            // Sort by start time, then by duration (longer first)
+            events.sort((a, b) => {
+                const diff = new Date(a.startTime).getTime() - new Date(b.startTime).getTime();
+                if (diff !== 0) return diff;
+                return (new Date(b.endTime).getTime() - new Date(b.startTime).getTime()) -
+                       (new Date(a.endTime).getTime() - new Date(a.startTime).getTime());
+            });
+            // Build overlap groups using a greedy column assignment
+            const columns: { end: number; eventId: string }[][] = [];
+            for (const event of events) {
+                const start = new Date(event.startTime).getTime();
+                const end = new Date(event.endTime).getTime();
+                // Find first column where this event doesn't overlap
+                let placed = false;
+                for (let col = 0; col < columns.length; col++) {
+                    const lastInCol = columns[col][columns[col].length - 1];
+                    if (lastInCol.end <= start) {
+                        columns[col].push({ end, eventId: event.id });
+                        placed = true;
+                        break;
+                    }
+                }
+                if (!placed) {
+                    columns.push([{ end, eventId: event.id }]);
+                }
+            }
+            // Now find the max columns each event actually shares with
+            // For each event, find all events that overlap it and determine the group width
+            for (const event of events) {
+                const start = new Date(event.startTime).getTime();
+                const end = new Date(event.endTime).getTime();
+                // Count how many columns have events overlapping this time range
+                let overlappingCols = 0;
+                for (const col of columns) {
+                    for (const item of col) {
+                        const itemStart = calendarEvents.find(e => e.id === item.eventId);
+                        if (itemStart) {
+                            const iStart = new Date(itemStart.startTime).getTime();
+                            const iEnd = new Date(itemStart.endTime).getTime();
+                            if (iStart < end && iEnd > start) {
+                                overlappingCols++;
+                                break;
+                            }
+                        }
+                    }
+                }
+                // Find which column this event is in
+                let eventCol = 0;
+                for (let col = 0; col < columns.length; col++) {
+                    if (columns[col].some(item => item.eventId === event.id)) {
+                        eventCol = col;
+                        break;
+                    }
+                }
+                layout[event.id] = { column: eventCol, totalColumns: Math.max(overlappingCols, 1) };
+            }
+        }
+        return layout;
+    }, [calendarEvents]);
+
     // Calculate event duration in pixels for proper height display
     const getEventDuration = (event: CalendarEvent): number => {
         if (isAllDayEvent(event)) return 0; // All-day events handled separately
@@ -7495,6 +7568,10 @@ export default function WeeklyView() {
                                                             ? eventColor
                                                             : "var(--weekly-teal)";
 
+                                                        const overlap = eventOverlapLayout[event.id] || { column: 0, totalColumns: 1 };
+                                                        const colWidth = 100 / overlap.totalColumns;
+                                                        const colLeft = overlap.column * colWidth;
+
                                                         return (
                                                             <div
                                                                 key={event.id}
@@ -7505,8 +7582,8 @@ export default function WeeklyView() {
                                                                     minHeight: `15px`,
                                                                     position: "absolute",
                                                                     top: `${topOffset}px`,
-                                                                    left: "1px",
-                                                                    right: "2px",
+                                                                    left: `calc(${colLeft}% + 1px)`,
+                                                                    width: `calc(${colWidth}% - 3px)`,
                                                                     zIndex: 1,
                                                                     flexDirection: "column",
                                                                     alignItems: "flex-start",
diff --git a/src/lib/outlook-calendar.ts b/src/lib/outlook-calendar.ts
index bdf71c4..e627f31 100644
--- a/src/lib/outlook-calendar.ts
+++ b/src/lib/outlook-calendar.ts
@@ -377,14 +377,14 @@ export const updateEvent = async (
         'Content-Type': 'application/json'
     };
 
-    // Try calendar-scoped endpoint first
-    let response = await fetch(`${GRAPH_ENDPOINT}/me/calendars/${encodeURIComponent(calendarId)}/events/${encodeURIComponent(eventId)}`, {
+    // Try non-calendar-scoped endpoint first (more reliable for all ID types)
+    let response = await fetch(`${GRAPH_ENDPOINT}/me/events/${eventId}`, {
         method: 'PATCH', headers: patchHeaders, body
     });
 
-    if (!response.ok && response.status === 404) {
-        // Fallback: try non-calendar-scoped endpoint
-        response = await fetch(`${GRAPH_ENDPOINT}/me/events/${encodeURIComponent(eventId)}`, {
+    if (!response.ok && (response.status === 404 || response.status === 400)) {
+        // Fallback: try calendar-scoped endpoint
+        response = await fetch(`${GRAPH_ENDPOINT}/me/calendars/${calendarId}/events/${eventId}`, {
             method: 'PATCH', headers: patchHeaders, body
         });
     }
@@ -414,21 +414,17 @@ export const deleteEvent = async (
     calendarId: string,
     eventId: string
 ) => {
-    // Try calendar-scoped endpoint first
-    let response = await fetch(`${GRAPH_ENDPOINT}/me/calendars/${encodeURIComponent(calendarId)}/events/${encodeURIComponent(eventId)}`, {
-        method: 'DELETE',
-        headers: {
-            'Authorization': `Bearer ${accessToken}`
-        }
+    const headers = { 'Authorization': `Bearer ${accessToken}` };
+
+    // Try non-calendar-scoped endpoint first (more reliable for all ID types)
+    let response = await fetch(`${GRAPH_ENDPOINT}/me/events/${eventId}`, {
+        method: 'DELETE', headers
     });
 
-    if (!response.ok && response.status === 404) {
-        // Fallback: try non-calendar-scoped endpoint (works better for series master IDs)
-        response = await fetch(`${GRAPH_ENDPOINT}/me/events/${encodeURIComponent(eventId)}`, {
-            method: 'DELETE',
-            headers: {
-                'Authorization': `Bearer ${accessToken}`
-            }
+    if (!response.ok && (response.status === 404 || response.status === 400)) {
+        // Fallback: try calendar-scoped endpoint
+        response = await fetch(`${GRAPH_ENDPOINT}/me/calendars/${calendarId}/events/${eventId}`, {
+            method: 'DELETE', headers
         });
     }