How to view your iCloud Calendar in Outlook for Windows

Instructions

1. Confirm that iCloud for Windows is installed.
2. Open iCloud
3. Check the box next to "Mail, Contacts, Calendars, and Tasks with Outlook"
4. Click "Apply"
5. If Outlook is open, it may prompt you to close Outlook. In that case, click OK.

You should now be able to view all of your iCloud calendars though Outlook.

Documentation

For more details, see Apple's official instructions:
Set up iCloud Calendars and Contacts in Outlook on your Windows computer - Apple Support