diff --git a/lib/services/microsoft-calendar-sync.ts b/lib/services/microsoft-calendar-sync.ts
index e088bc8..2294ab7 100644
--- a/lib/services/microsoft-calendar-sync.ts
+++ b/lib/services/microsoft-calendar-sync.ts
@@ -138,28 +138,22 @@ export async function fetchMicrosoftEvents(
     };
 
     // Add date filter if provided
-    // Note: Microsoft Graph API filter syntax
-    // For timed events: start/dateTime
-    // For all-day events: start/date
-    // We need to handle both cases
+    // Note: Microsoft Graph API filter syntax is limited
+    // We can't easily filter both dateTime and date in one query
+    // So we'll filter by dateTime and handle all-day events separately if needed
     if (startDate && endDate) {
       // Format dates for Microsoft Graph API
-      // For dateTime: ISO 8601 format (e.g., 2026-01-14T21:00:00Z)
-      // For date: YYYY-MM-DD format
-      const startDateStr = startDate.toISOString().split('T')[0];
-      const endDateStr = endDate.toISOString().split('T')[0];
+      // Use ISO 8601 format for dateTime filter
       const startDateTimeStr = startDate.toISOString();
       const endDateTimeStr = endDate.toISOString();
       
-      // Microsoft Graph API filter: match events where start is within range
-      // This handles both timed events (dateTime) and all-day events (date)
-      // The filter checks if either dateTime OR date is within range
-      params.$filter = `(start/dateTime ge '${startDateTimeStr}' or start/date ge '${startDateStr}') and (start/dateTime le '${endDateTimeStr}' or start/date le '${endDateStr}')`;
+      // Microsoft Graph API filter: filter by start/dateTime
+      // This will match timed events. All-day events might need separate handling
+      // but Microsoft Graph usually returns all-day events with dateTime set to start of day
+      params.$filter = `start/dateTime ge '${startDateTimeStr}' and start/dateTime le '${endDateTimeStr}'`;
       
       logger.debug('Microsoft Graph API filter', {
         filter: params.$filter,
-        startDate: startDateStr,
-        endDate: endDateStr,
         startDateTime: startDateTimeStr,
         endDateTime: endDateTimeStr,
       });
@@ -214,13 +208,24 @@ export async function fetchMicrosoftEvents(
     }
 
     return events;
-  } catch (error) {
-    logger.error('Error fetching Microsoft events', {
+  } catch (error: any) {
+    // Log detailed error information for debugging
+    const errorDetails: any = {
       userId,
       email,
       calendarId,
       error: error instanceof Error ? error.message : String(error),
-    });
+    };
+    
+    if (error.response) {
+      errorDetails.status = error.response.status;
+      errorDetails.statusText = error.response.statusText;
+      errorDetails.data = error.response.data;
+      errorDetails.url = error.config?.url;
+      errorDetails.params = error.config?.params;
+    }
+    
+    logger.error('Error fetching Microsoft events', errorDetails);
     throw error;
   }
 }