开发Outlook日历概览应用：获取他人可用性信息受阻

Hey there, let's break down how to handle this shared calendar permission issue you're encountering. It's super common when working with Outlook's granular permission settings, so here are actionable steps to adjust your app:

• Adapt to Restricted API Data
  If you're using Microsoft Graph API (or the legacy Outlook REST API), calendars with "View Availability Only" permissions will return limited event data—usually just start/end timestamps and a generic subject like "Busy" instead of full event details. Your app can still calculate unplanned time by:

  1. Parsing the start and end values to mark occupied time slots.
  2. Checking for missing fields (like event body or custom categories) to detect restricted permissions, then falling back to availability-only calculations.

• Add User-Friendly Permissions Guidance
  When your app detects a restricted calendar, display a clear message to the user:

  This shared calendar is set to "View Availability Only"—we can calculate unplanned time based on busy/free status, but can't access event details for deeper analysis. To get full insights, ask the calendar owner to grant "View All Details" permissions.

• Test with a Restricted Calendar
  Since you've manually verified the permission behavior, create a test shared calendar with the same "View Availability Only" setting. Call your API against this calendar to see the exact data structure returned, then tweak your parsing logic to handle this edge case reliably. For example, if events have a isPrivate flag set or lack a custom subject, treat them as generic busy blocks.

• Handle Permission Errors Gracefully
  Some restricted calendars might return a 403 Forbidden error when trying to fetch details. Make sure your app catches these errors, logs them for debugging, and shows a non-technical message to the user instead of crashing.

内容的提问来源于stack exchange，提问作者Berend