I can offer some potential workarounds for your situation:
Update iCloud for Windows: Make sure you have the latest version of iCloud for Windows installed on your computer. Apple frequently releases updates to improve compatibility and address known issues. Visit the Apple Support website to download and install the latest version if you haven't already.
Check Outlook compatibility: Confirm that your version of Outlook 2013 is fully compatible with iCloud for Windows. Older versions of Outlook may not support all features or integrations. Consider upgrading to a newer version of Outlook if compatibility is a concern.
Repair or reinstall iCloud for Windows: If you already have iCloud for Windows installed, try repairing or reinstalling it. This process can sometimes resolve compatibility issues or restore missing features. To do this, go to the Control Panel in Windows, locate the "iCloud" entry, and choose the appropriate repair or uninstall option.
Use the iCloud web interface: As an alternative, you can access your iCloud Mail, Calendar, and Contacts through the iCloud website using a web browser. This method doesn't require any software installations or integrations and should work regardless of your operating system.
Contact Apple Support: If none of the above solutions work, it's recommended to reach out to Apple Support directly. They can provide the most up-to-date information and assist you further with any iCloud for Windows issues you're encountering.
Remember, the software landscape can change over time,.Therefore, staying updated with the latest software releases and checking official documentation or forums for iCloud and Windows 11 compatibility may also be helpful in finding a solution.