If you have not already exported your iCloud calendar, please review this article: How do I export or backup my iCloud calendar?.
Once you have exported your iCloud calendar, continue with the steps below:
- Open Outlook.
- Click File at the top left corner.
- Click Open & Export.
- Click Import/Export.
- When the Import and Export Wizard window opens, click Import an iCalendar(.ics) or vCalendar(.vcs) file, then click Next.
- When the Browse window appears, navigate to where you saved your calendar file, click it, then click Open.
Your calendar should now be imported.